Vulnerability-Lookup

RHSA-2026:74377

Vulnerability from csaf_redhat - Published: 2026-10-06 19:01 - Updated: 2026-10-07 17:19

Summary

Red Hat Security Advisory: OpenShift Container Platform 4.20.41 bug fix and security update

Severity

Important

Notes

Topic: Red Hat OpenShift Container Platform release 4.20.41 is now available with updates to packages and images that fix several bugs and add enhancements. This release includes a security update for Red Hat OpenShift Container Platform 4.20. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments. This advisory contains the container images for Red Hat OpenShift Container Platform 4.20.41. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/RHSA-2026:74376 Space precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes: https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/release_notes/ Security Fix(es): * kernel: sctp: prevent peer transport count overflow (CVE-2026-74469) * kernel: xfrm: ah6: validate routing header segments_left (CVE-2026-80844) * kernel: net: tun: bound receive headroom (CVE-2026-81000) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section. All OpenShift Container Platform 4.20 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html-single/updating_clusters/index#updating-cluster-cli.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2026-74469

A flaw was found in the Stream Control Transmission Protocol (SCTP) implementation within the Linux kernel. An integer overflow occurs when the `transport_count` for an association exceeds its 16-bit limit, causing it to wrap around to zero. This allows a diagnostic dump to write 8 MiB of peer addresses beyond the intended memory buffer, leading to an out-of-bounds write. This memory corruption can result in a denial of service (DoS) due to system instability or crashes.

8.3 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

CWE-787 - Out-of-bounds Write

Affected products

Fixed 4 products

Product	Version	Remediation
Unresolved product id: 9Base-RHOSE-4.20:rhcos-aarch64-4.20.9.6.202609301206-0	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.20:rhcos-ppc64le-4.20.9.6.202609301206-0	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202609301206-0	—	Vendor Fix fix Workaround
Unresolved product id: 9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202609301206-0	—	Vendor Fix fix Workaround

Threats

Impact Low

CVE-2026-80844

A flaw was found in the Linux kernel's xfrm subsystem, specifically within the AH6 (Authentication Header for IPv6) module. The `ipv6_rearrange_rthdr()` function does not properly validate the `segments_left` field in routing headers when processing raw IPv6 HDRINCL packets. This oversight allows an attacker to craft a malicious packet that can cause an out-of-bounds memory access, potentially leading to memory corruption.

8.3 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H

CWE-805 - Buffer Access with Incorrect Length Value

Affected products

Fixed 4 products, the same list as for CVE-2026-74469

Threats

Impact Low

CVE-2026-81000

A flaw was found in the Linux kernel's TUN/TAP driver. An integer underflow vulnerability exists in the tun_get_user() function when processing oversized headroom requests. This can occur if Open vSwitch (OVS) propagates an excessively large headroom request to the TUN or TAP device. Successful exploitation could lead to memory corruption, where network packet data is written outside its intended buffer, potentially causing a denial of service or other system instability.

7.8 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-787 - Out-of-bounds Write

Affected products

Fixed 4 products, the same list as for CVE-2026-74469

Threats

Impact Low

References

23 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:74377	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2517043	external
https://bugzilla.redhat.com/show_bug.cgi?id=2528676	external
https://bugzilla.redhat.com/show_bug.cgi?id=2532176	external
https://issues.redhat.com/browse/OCPBUGS-129075	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2026-74469	self
https://bugzilla.redhat.com/show_bug.cgi?id=2517043	external
https://access.redhat.com/security/vulnerabilitie…	external
https://www.cve.org/CVERecord?id=CVE-2026-74469	external
https://nvd.nist.gov/vuln/detail/CVE-2026-74469	external
https://lore.kernel.org/linux-cve-announce/202608…	external
https://access.redhat.com/security/cve/CVE-2026-80844	self
https://bugzilla.redhat.com/show_bug.cgi?id=2528676	external
https://www.cve.org/CVERecord?id=CVE-2026-80844	external
https://nvd.nist.gov/vuln/detail/CVE-2026-80844	external
https://git.kernel.org/pub/scm/linux/security/vul…	external
https://access.redhat.com/security/cve/CVE-2026-81000	self
https://bugzilla.redhat.com/show_bug.cgi?id=2532176	external
https://www.cve.org/CVERecord?id=CVE-2026-81000	external
https://nvd.nist.gov/vuln/detail/CVE-2026-81000	external
https://git.kernel.org/pub/scm/linux/security/vul…	external

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          "details": "For OpenShift Container Platform 4.20 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n      (For x86_64 architecture)\n      The image digest is sha256:735d04d245382654d1d2441a8c7746bc84be421362af51bbb678e0d2cc7bc05a\n\n      (For s390x architecture)\n      The image digest is sha256:9e945e71cd108774f9d95c18af0b5dbb7e48123d93dc1efece727b1517a31d76\n\n      (For ppc64le architecture)\n      The image digest is sha256:817b8dd9d1e230c340cdd4b6523b8ad30eeb766e415cfca5bb11a8a2223445b3\n\n      (For aarch64 architecture)\n      The image digest is sha256:93c246ded6fbe89491a73f7a5e589d02f525a6547c14cbe980f0a9d4327f8830\n\nAll OpenShift Container Platform 4.20 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html-single/updating_clusters/index#updating-cluster-cli.",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
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      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "kernel: sctp: prevent peer transport count overflow"
    },
    {
      "cve": "CVE-2026-80844",
      "cwe": {
        "id": "CWE-805",
        "name": "Buffer Access with Incorrect Length Value"
      },
      "discovery_date": "2026-09-04T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2528676"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s xfrm subsystem, specifically within the AH6 (Authentication Header for IPv6) module. The `ipv6_rearrange_rthdr()` function does not properly validate the `segments_left` field in routing headers when processing raw IPv6 HDRINCL packets. This oversight allows an attacker to craft a malicious packet that can cause an out-of-bounds memory access, potentially leading to memory corruption.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: xfrm: ah6: validate routing header segments_left",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This issue is classified as Important severity because exploitation can be achieved by a local attacker with unprivileged user access. An attack could leverage user namespaces to obtain elevated network permissions within the namespace, then sends specially crafted IPv6 packets with malformed Authentication Header routing headers. Exploitation is challenging but achievable due to complex setup including IPv6 AH/XFRM, ESP-in-UDP encapsulation, and specific timing and memory layout conditions. This memory corruption can enable local privilege escalation to root from an unprivileged user account.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "9Base-RHOSE-4.20:rhcos-aarch64-4.20.9.6.202609301206-0",
          "9Base-RHOSE-4.20:rhcos-ppc64le-4.20.9.6.202609301206-0",
          "9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202609301206-0",
          "9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202609301206-0"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-80844"
        },
        {
          "category": "external",
          "summary": "RHBZ#2528676",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2528676"
        },
        {
          "category": "external",
          "summary": "RHSB-2026-011",
          "url": "https://access.redhat.com/security/vulnerabilities/RHSB-2026-011"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-80844",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-80844"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-80844",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80844"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80844.mbox",
          "url": "https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80844.mbox"
        }
      ],
      "release_date": "2026-09-04T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-06T19:01:33+00:00",
          "details": "For OpenShift Container Platform 4.20 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n      (For x86_64 architecture)\n      The image digest is sha256:735d04d245382654d1d2441a8c7746bc84be421362af51bbb678e0d2cc7bc05a\n\n      (For s390x architecture)\n      The image digest is sha256:9e945e71cd108774f9d95c18af0b5dbb7e48123d93dc1efece727b1517a31d76\n\n      (For ppc64le architecture)\n      The image digest is sha256:817b8dd9d1e230c340cdd4b6523b8ad30eeb766e415cfca5bb11a8a2223445b3\n\n      (For aarch64 architecture)\n      The image digest is sha256:93c246ded6fbe89491a73f7a5e589d02f525a6547c14cbe980f0a9d4327f8830\n\nAll OpenShift Container Platform 4.20 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html-single/updating_clusters/index#updating-cluster-cli.",
          "product_ids": [
            "9Base-RHOSE-4.20:rhcos-aarch64-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-ppc64le-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202609301206-0"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:74377"
        },
        {
          "category": "workaround",
          "details": "See the security bulletin for a detailed mitigation procedure.",
          "product_ids": [
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            "9Base-RHOSE-4.20:rhcos-ppc64le-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202609301206-0"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
            "version": "3.1"
          },
          "products": [
            "9Base-RHOSE-4.20:rhcos-aarch64-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-ppc64le-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202609301206-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "kernel: xfrm: ah6: validate routing header segments_left"
    },
    {
      "cve": "CVE-2026-81000",
      "cwe": {
        "id": "CWE-787",
        "name": "Out-of-bounds Write"
      },
      "discovery_date": "2026-09-11T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2532176"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s TUN/TAP driver. An integer underflow vulnerability exists in the tun_get_user() function when processing oversized headroom requests. This can occur if Open vSwitch (OVS) propagates an excessively large headroom request to the TUN or TAP device. Successful exploitation could lead to memory corruption, where network packet data is written outside its intended buffer, potentially causing a denial of service or other system instability.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: net: tun: bound receive headroom",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
      "product_status": {
        "fixed": [
          "9Base-RHOSE-4.20:rhcos-aarch64-4.20.9.6.202609301206-0",
          "9Base-RHOSE-4.20:rhcos-ppc64le-4.20.9.6.202609301206-0",
          "9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202609301206-0",
          "9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202609301206-0"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-81000"
        },
        {
          "category": "external",
          "summary": "RHBZ#2532176",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532176"
        },
        {
          "category": "external",
          "summary": "RHSB-2026-011",
          "url": "https://access.redhat.com/security/vulnerabilities/RHSB-2026-011"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-81000",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-81000"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-81000",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-81000"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-81000.mbox",
          "url": "https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-81000.mbox"
        }
      ],
      "release_date": "2026-09-11T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-10-06T19:01:33+00:00",
          "details": "For OpenShift Container Platform 4.20 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata for x86_64, s390x, ppc64le, and aarch64 architectures. The image digests may be found at https://quay.io/repository/openshift-release-dev/ocp-release?tab=tags.\n\nThe sha values for the release are as follows:\n\n      (For x86_64 architecture)\n      The image digest is sha256:735d04d245382654d1d2441a8c7746bc84be421362af51bbb678e0d2cc7bc05a\n\n      (For s390x architecture)\n      The image digest is sha256:9e945e71cd108774f9d95c18af0b5dbb7e48123d93dc1efece727b1517a31d76\n\n      (For ppc64le architecture)\n      The image digest is sha256:817b8dd9d1e230c340cdd4b6523b8ad30eeb766e415cfca5bb11a8a2223445b3\n\n      (For aarch64 architecture)\n      The image digest is sha256:93c246ded6fbe89491a73f7a5e589d02f525a6547c14cbe980f0a9d4327f8830\n\nAll OpenShift Container Platform 4.20 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.20/html-single/updating_clusters/index#updating-cluster-cli.",
          "product_ids": [
            "9Base-RHOSE-4.20:rhcos-aarch64-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-ppc64le-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202609301206-0"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:74377"
        },
        {
          "category": "workaround",
          "details": "See the security bulletin for a detailed mitigation procedure.",
          "product_ids": [
            "9Base-RHOSE-4.20:rhcos-aarch64-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-ppc64le-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202609301206-0"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "9Base-RHOSE-4.20:rhcos-aarch64-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-ppc64le-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-s390x-4.20.9.6.202609301206-0",
            "9Base-RHOSE-4.20:rhcos-x86_64-4.20.9.6.202609301206-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Low"
        }
      ],
      "title": "kernel: net: tun: bound receive headroom"
    }
  ]
}

CVE-2026-74469 (GCVE-0-2026-74469)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-19 16:37

Title

sctp: prevent peer transport count overflow

Summary

In the Linux kernel, the following vulnerability has been resolved: sctp: prevent peer transport count overflow sctp_assoc_add_peer() increments the association's 16-bit transport_count for every new unique peer. Adding the 65,536th transport wraps the count to zero. SCTP sock_diag uses transport_count to reserve the INET_DIAG_PEERS payload, then copies one sockaddr_storage for every entry in transport_addr_list. After the wrap, a diagnostic dump reserves an empty payload and writes 8 MiB of peer addresses past the skb tail. Reject a new unique peer when transport_count has reached U16_MAX. Perform the check after the existing-peer lookup so a duplicate address continues to return its existing transport at the limit.

Severity

8.8 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/b453e00da1211e997…
https://git.kernel.org/stable/c/dfea32dd76f390e31…
https://git.kernel.org/stable/c/80f48523a0fe42db2…
https://git.kernel.org/stable/c/546221b86ceeba0d8…
https://git.kernel.org/stable/c/09e722030e8148ba4…
https://git.kernel.org/stable/c/4ba5bf7ed50f235ea…
https://git.kernel.org/stable/c/6201cd1d70f1670c5…
https://git.kernel.org/stable/c/bd0e9289e2642f6a5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < b453e00da1211e997b82743d28af7714c59c05c8 (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < dfea32dd76f390e3155177b0038cc47b01386198 (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 80f48523a0fe42db2e7375dff4e38a25c117090a (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 546221b86ceeba0d8fec92d46a0604bb7b62be07 (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 09e722030e8148ba4ed1e42c6b2ea57bda9f9895 (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0 (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75 (git) Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < bd0e9289e2642f6a5c54faad304ce0f41e926d22 (git)
Linux	Linux	Affected: 4.7 Unaffected: 0 , < 4.7 (semver) Unaffected: 5.10.265 , ≤ 5.10.* (semver) Unaffected: 5.15.216 , ≤ 5.15.* (semver) Unaffected: 6.1.183 , ≤ 6.1.* (semver) Unaffected: 6.6.151 , ≤ 6.6.* (semver) Unaffected: 6.12.103 , ≤ 6.12.* (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

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To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/associola.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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      "cpeApplicability": [
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.103",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "4.7",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: prevent peer transport count overflow\n\nsctp_assoc_add_peer() increments the association\u0027s 16-bit transport_count\nfor every new unique peer. Adding the 65,536th transport wraps the count to\nzero.\n\nSCTP sock_diag uses transport_count to reserve the INET_DIAG_PEERS payload,\nthen copies one sockaddr_storage for every entry in transport_addr_list.\nAfter the wrap, a diagnostic dump reserves an empty payload and writes\n8 MiB of peer addresses past the skb tail.\n\nReject a new unique peer when transport_count has reached U16_MAX. Perform\nthe check after the existing-peer lookup so a duplicate address continues\nto return its existing transport at the limit."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - Remote SCTP peers add unique transports via INIT address parameters and ASCONF ADD_IP chunks processed in sctp_assoc_add_peer(); this is network ingress on SCTP servers (telecom, signaling gateways) before any local diagnostic action.\nAC:L - An attacker controlling an SCTP association can script 65536 unique peer addresses via connectx, repeated ASCONF ADD_IP, or INIT parameters; no race or victim-specific state is required beyond reaching the transport limit.\nPR:L - The heap overflow is triggered via NETLINK_SOCK_DIAG (ss/netlink), reachable by unprivileged users; SCTP socket creation and connectx need no capabilities beyond a normal local account (including user namespaces).\nUI:N - Exploitation requires no victim interaction; the attacker drives transport accumulation and issues the diagnostic dump themselves.\nS:U - Impact is kernel heap corruption within the same kernel security boundary; this is not a VM escape, sandbox breakout, or cross-authority scope change.\nC:H - When transport_count wraps to zero, inet_diag_msg_sctpaddrs_fill() reserves no space but iterates all 65536 transports, writing ~8 MiB past the skb tail and enabling adjacent kernel heap reads.\nI:H - The same diag path performs a massive out-of-bounds write of sockaddr_storage entries past the allocated skb buffer, corrupting adjacent kernel heap objects and enabling control-flow hijacking.\nA:H - Corrupting sk_buff heap metadata and adjacent allocations via an ~8 MiB out-of-bounds write can cause kernel oops, panic, or hang, meeting high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:37:15.198Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b453e00da1211e997b82743d28af7714c59c05c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/dfea32dd76f390e3155177b0038cc47b01386198"
        },
        {
          "url": "https://git.kernel.org/stable/c/80f48523a0fe42db2e7375dff4e38a25c117090a"
        },
        {
          "url": "https://git.kernel.org/stable/c/546221b86ceeba0d8fec92d46a0604bb7b62be07"
        },
        {
          "url": "https://git.kernel.org/stable/c/09e722030e8148ba4ed1e42c6b2ea57bda9f9895"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ba5bf7ed50f235ea4581de8e7a0002f4ed287b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/6201cd1d70f1670c5b31ac506e7ab2fa7b8e7f75"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd0e9289e2642f6a5c54faad304ce0f41e926d22"
        }
      ],
      "title": "sctp: prevent peer transport count overflow",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74469",
    "datePublished": "2026-08-15T12:27:06.873Z",
    "dateReserved": "2026-08-15T05:44:03.902Z",
    "dateUpdated": "2026-08-19T16:37:15.198Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-80844 (GCVE-0-2026-80844)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:54 – Updated: 2026-09-04 15:54

Title

xfrm: ah6: validate routing header segments_left

Summary

In the Linux kernel, the following vulnerability has been resolved: xfrm: ah6: validate routing header segments_left AH6 rearranges routing-header addresses before computing or verifying the ICV. ipv6_rearrange_rthdr() assumes that segments_left is not larger than the number of addresses described by the routing header's hdrlen field. That assumption does not hold for raw IPv6 HDRINCL packets. A packet with hdrlen equal to 2 describes one address, but can carry an arbitrary segments_left value. With segments_left equal to 255, the function moves its address pointer 4,064 bytes backwards and passes a 4,064-byte length to memmove(), resulting in an out-of-bounds access. Validate the invariant locally before modifying the routing header or performing any address-pointer arithmetic, and propagate malformed-header errors to the existing AH6 input and output error paths.

Severity

No CVSS data available.

Assigner

Linux mitre root Scorecard

References

9 references

URL	Tags
https://git.kernel.org/stable/c/2dc650956e4e163b8…
https://git.kernel.org/stable/c/48b0e36cf54358276…
https://git.kernel.org/stable/c/1b7e066eabcc7d6d8…
https://git.kernel.org/stable/c/f00df8500e5a36ba7…
https://git.kernel.org/stable/c/1516e31ac458a738b…
https://git.kernel.org/stable/c/6733ae71268a27d59…
https://git.kernel.org/stable/c/0bf11081ad3753938…
https://git.kernel.org/stable/c/46640c814f25f096b…
https://git.kernel.org/stable/c/7bad4bda74dc4713f…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2dc650956e4e163b879b3fb1027f9557abc5c985 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 48b0e36cf54358276ee7aa897034c973097d2bc9 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1b7e066eabcc7d6d8f476c34739b45932f2f4c31 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f00df8500e5a36ba70d336fd34bd2152ea074e5f (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1516e31ac458a738be485620579d8f7fb2700fcb (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6733ae71268a27d598cfb3f3339a3c950b9b656d (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0bf11081ad3753938a2b48723ce6298dbac743a1 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 46640c814f25f096b0b0045ca50e1b7030cd8a30 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7bad4bda74dc4713f398d3b7624ff05478e3a568 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.269 , ≤ 5.10.* (semver) Unaffected: 5.15.220 , ≤ 5.15.* (semver) Unaffected: 6.1.187 , ≤ 6.1.* (semver) Unaffected: 6.6.156 , ≤ 6.6.* (semver) Unaffected: 6.12.108 , ≤ 6.12.* (semver) Unaffected: 6.18.49 , ≤ 6.18.* (semver) Unaffected: 7.1.13 , ≤ 7.1.* (semver) Unaffected: 7.2.3 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/ah6.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2dc650956e4e163b879b3fb1027f9557abc5c985",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "48b0e36cf54358276ee7aa897034c973097d2bc9",
              "status": "affected",
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              "versionType": "git"
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
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              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
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              "version": "2.6.12"
            },
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              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.269",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.220",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.187",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.156",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.108",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.49",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.3",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.269",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.220",
                  "versionStartIncluding": "2.6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.108",
                  "versionStartIncluding": "2.6.12",
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                },
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                  "versionStartIncluding": "2.6.12",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                },
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                  "versionEndExcluding": "7.3-rc1",
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: ah6: validate routing header segments_left\n\nAH6 rearranges routing-header addresses before computing or verifying the\nICV. ipv6_rearrange_rthdr() assumes that segments_left is not larger than\nthe number of addresses described by the routing header\u0027s hdrlen field.\n\nThat assumption does not hold for raw IPv6 HDRINCL packets. A packet with\nhdrlen equal to 2 describes one address, but can carry an arbitrary\nsegments_left value. With segments_left equal to 255, the function moves\nits address pointer 4,064 bytes backwards and passes a 4,064-byte length to\nmemmove(), resulting in an out-of-bounds access.\n\nValidate the invariant locally before modifying the routing header or\nperforming any address-pointer arithmetic, and propagate malformed-header\nerrors to the existing AH6 input and output error paths."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:54:54.295Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
        {
          "url": "https://git.kernel.org/stable/c/48b0e36cf54358276ee7aa897034c973097d2bc9"
        },
        {
          "url": "https://git.kernel.org/stable/c/1b7e066eabcc7d6d8f476c34739b45932f2f4c31"
        },
        {
          "url": "https://git.kernel.org/stable/c/f00df8500e5a36ba70d336fd34bd2152ea074e5f"
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        {
          "url": "https://git.kernel.org/stable/c/1516e31ac458a738be485620579d8f7fb2700fcb"
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        {
          "url": "https://git.kernel.org/stable/c/6733ae71268a27d598cfb3f3339a3c950b9b656d"
        },
        {
          "url": "https://git.kernel.org/stable/c/0bf11081ad3753938a2b48723ce6298dbac743a1"
        },
        {
          "url": "https://git.kernel.org/stable/c/46640c814f25f096b0b0045ca50e1b7030cd8a30"
        },
        {
          "url": "https://git.kernel.org/stable/c/7bad4bda74dc4713f398d3b7624ff05478e3a568"
        }
      ],
      "title": "xfrm: ah6: validate routing header segments_left",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80844",
    "datePublished": "2026-09-04T15:54:54.295Z",
    "dateReserved": "2026-08-26T14:34:25.796Z",
    "dateUpdated": "2026-09-04T15:54:54.295Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2026-81000 (GCVE-0-2026-81000)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-14 11:59

Title

net: tun: bound receive headroom

Summary

In the Linux kernel, the following vulnerability has been resolved: net: tun: bound receive headroom tun_get_user() uses tun->align both as skb headroom and when choosing how much packet data to keep linear. OVS can propagate an oversized headroom request from another port to TUN or TAP. When align is larger than the usable space in a one-page skb head, SKB_MAX_HEAD(align) underflows and the result becomes negative when stored in good_linear. That value later wraps when assigned to the size_t linear variable, and tun_alloc_skb() can place skb->data outside the allocated head. Bound the headroom stored by TUN to the one-page skb-head budget and the largest non-sentinel 16-bit skb header offset. Leave one linear byte for raw TUN and a complete Ethernet header for TAP, including NET_IP_ALIGN. Also pull the raw-TUN protocol byte and the TAP Ethernet header before accessing them, so these checks remain safe for nonlinear skbs supplied by other allocation paths.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/ad715e713610d2d54…
https://git.kernel.org/stable/c/708e87937de93f445…
https://git.kernel.org/stable/c/18ef24cdb2eba32e3…
https://git.kernel.org/stable/c/010eee265d6bd8769…
https://git.kernel.org/stable/c/379d85c7f25f3e05a…
https://git.kernel.org/stable/c/e098d9cc8859614a7…
https://git.kernel.org/stable/c/0ada54ea63e48b9c1…
https://git.kernel.org/stable/c/447c9303942c439a1…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: eaea34b23c46bf17b4a5638be69ab3561854f34b , < ad715e713610d2d5473c3a6498c825ccecf26491 (git) Affected: eaea34b23c46bf17b4a5638be69ab3561854f34b , < 708e87937de93f445225c134a2e20519f9b4ce60 (git) Affected: eaea34b23c46bf17b4a5638be69ab3561854f34b , < 18ef24cdb2eba32e38f1d27f2d02b7b4212e8f76 (git) Affected: eaea34b23c46bf17b4a5638be69ab3561854f34b , < 010eee265d6bd8769b6a523d2a0693d9b3f5df43 (git) Affected: eaea34b23c46bf17b4a5638be69ab3561854f34b , < 379d85c7f25f3e05a428225e6b8a65613c6e9b9d (git) Affected: eaea34b23c46bf17b4a5638be69ab3561854f34b , < e098d9cc8859614a7f7baebc96e32a5a16b18ed2 (git) Affected: eaea34b23c46bf17b4a5638be69ab3561854f34b , < 0ada54ea63e48b9c1608e917ccb7dfadbe86db28 (git) Affected: eaea34b23c46bf17b4a5638be69ab3561854f34b , < 447c9303942c439a117d9b76ce6d6e2116b38ee7 (git)
Linux	Linux	Affected: 4.6 Unaffected: 0 , < 4.6 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/tun.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ad715e713610d2d5473c3a6498c825ccecf26491",
              "status": "affected",
              "version": "eaea34b23c46bf17b4a5638be69ab3561854f34b",
              "versionType": "git"
            },
            {
              "lessThan": "708e87937de93f445225c134a2e20519f9b4ce60",
              "status": "affected",
              "version": "eaea34b23c46bf17b4a5638be69ab3561854f34b",
              "versionType": "git"
            },
            {
              "lessThan": "18ef24cdb2eba32e38f1d27f2d02b7b4212e8f76",
              "status": "affected",
              "version": "eaea34b23c46bf17b4a5638be69ab3561854f34b",
              "versionType": "git"
            },
            {
              "lessThan": "010eee265d6bd8769b6a523d2a0693d9b3f5df43",
              "status": "affected",
              "version": "eaea34b23c46bf17b4a5638be69ab3561854f34b",
              "versionType": "git"
            },
            {
              "lessThan": "379d85c7f25f3e05a428225e6b8a65613c6e9b9d",
              "status": "affected",
              "version": "eaea34b23c46bf17b4a5638be69ab3561854f34b",
              "versionType": "git"
            },
            {
              "lessThan": "e098d9cc8859614a7f7baebc96e32a5a16b18ed2",
              "status": "affected",
              "version": "eaea34b23c46bf17b4a5638be69ab3561854f34b",
              "versionType": "git"
            },
            {
              "lessThan": "0ada54ea63e48b9c1608e917ccb7dfadbe86db28",
              "status": "affected",
              "version": "eaea34b23c46bf17b4a5638be69ab3561854f34b",
              "versionType": "git"
            },
            {
              "lessThan": "447c9303942c439a117d9b76ce6d6e2116b38ee7",
              "status": "affected",
              "version": "eaea34b23c46bf17b4a5638be69ab3561854f34b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/tun.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.6"
            },
            {
              "lessThan": "4.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.109",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "4.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tun: bound receive headroom\n\ntun_get_user() uses tun-\u003ealign both as skb headroom and when choosing how\nmuch packet data to keep linear. OVS can propagate an oversized headroom\nrequest from another port to TUN or TAP.\n\nWhen align is larger than the usable space in a one-page skb head,\nSKB_MAX_HEAD(align) underflows and the result becomes negative when stored\nin good_linear. That value later wraps when assigned to the size_t linear\nvariable, and tun_alloc_skb() can place skb-\u003edata outside the allocated\nhead.\n\nBound the headroom stored by TUN to the one-page skb-head budget and the\nlargest non-sentinel 16-bit skb header offset. Leave one linear byte for\nraw TUN and a complete Ethernet header for TAP, including NET_IP_ALIGN.\n\nAlso pull the raw-TUN protocol byte and the TAP Ethernet header before\naccessing them, so these checks remain safe for nonlinear skbs supplied by\nother allocation paths."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - tun_get_user() runs on write/sendmsg to /dev/net/tun after ndo_set_rx_headroom stores an oversized tun-\u003ealign. That is a local tun/tap injection path, not parsing of frames received from a remote peer.\nAC:L - The attacker fully controls both sides: inflate rx headroom via netkit IFLA_NETKIT_HEADROOM or the OVS/veth/VXLAN and bridge/veth/GRETAP loops, then write a TUN frame. No race or uninfluenced victim state is required.\nPR:L - TUNSETIFF uses ns_capable(net-\u003euser_ns, CAP_NET_ADMIN) and OVS vport commands use GENL_UNS_ADMIN_PERM, so an unprivileged user with a user+net namespace can create the topology and trigger the write.\nUI:N - The attacker opens /dev/net/tun, configures local net devices, and writes the frame; no separate victim action is required.\nS:U - The out-of-bounds access occurs in the same kernel that handles the local TUN write and yields privilege escalation within that kernel, not a VM/IOMMU boundary crossing.\nC:H - SKB_MAX_HEAD underflow wraps the linear length so tun_alloc_skb()/skb_reserve() can place skb-\u003edata outside the allocated head, turning later header reads and packet processing into out-of-bounds kernel reads.\nI:H - After skb-\u003edata is moved outside the allocated head, skb_copy_datagram_from_iter copies attacker-controlled frame bytes relative to that pointer, an out-of-bounds write usable for kernel corruption and control-flow hijacking.\nA:H - The misplaced skb leads to a kernel oops, BUG() in eth_type_trans/__skb_pull on a nonlinear TAP skb, or panic when the out-of-bounds access is hit."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T11:59:35.300Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ad715e713610d2d5473c3a6498c825ccecf26491"
        },
        {
          "url": "https://git.kernel.org/stable/c/708e87937de93f445225c134a2e20519f9b4ce60"
        },
        {
          "url": "https://git.kernel.org/stable/c/18ef24cdb2eba32e38f1d27f2d02b7b4212e8f76"
        },
        {
          "url": "https://git.kernel.org/stable/c/010eee265d6bd8769b6a523d2a0693d9b3f5df43"
        },
        {
          "url": "https://git.kernel.org/stable/c/379d85c7f25f3e05a428225e6b8a65613c6e9b9d"
        },
        {
          "url": "https://git.kernel.org/stable/c/e098d9cc8859614a7f7baebc96e32a5a16b18ed2"
        },
        {
          "url": "https://git.kernel.org/stable/c/0ada54ea63e48b9c1608e917ccb7dfadbe86db28"
        },
        {
          "url": "https://git.kernel.org/stable/c/447c9303942c439a117d9b76ce6d6e2116b38ee7"
        }
      ],
      "title": "net: tun: bound receive headroom",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-81000",
    "datePublished": "2026-09-11T19:42:54.181Z",
    "dateReserved": "2026-08-26T14:34:25.812Z",
    "dateUpdated": "2026-09-14T11:59:35.300Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

RHSA-2026:74377

CVE-2026-74469 (GCVE-0-2026-74469)

CVE-2026-80844 (GCVE-0-2026-80844)

CVE-2026-81000 (GCVE-0-2026-81000)

Tags

Sightings

Nomenclature

Related by attack behaviour