RHSA-2026:71649
Vulnerability from csaf_redhat - Published: 2026-09-24 16:06 - Updated: 2026-10-01 09:50Summary
Red Hat Security Advisory: kernel security update
Severity
Important
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION.
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: The kernel packages contain the Linux kernel, the core of any Linux operating system.
Security Fix(es):
* kernel: Linux kernel: PPPoE memory corruption via stale pointer (CVE-2026-68121)
* kernel: xfrm: ah6: validate routing header segments_left (CVE-2026-80844)
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.
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.
A flaw was found in the Linux kernel's PPPoE (Point-to-Point Protocol over Ethernet) implementation. This vulnerability occurs because a pointer to network packet data is not updated after memory is reallocated, leading to the use of an outdated memory address. An attacker with local access could potentially trigger this condition, causing memory corruption. This could result in a system crash (denial of service) or other unpredictable system behavior.
7.3 (High)
Affected products
Fixed
56 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 6Server-ELS.EXTENSION:kernel-0:2.6.32-754.63.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-0:2.6.32-754.63.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-0:2.6.32-754.63.1.el6.src | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-0:2.6.32-754.63.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-abi-whitelists-0:2.6.32-754.63.1.el6.noarch | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debug-0:2.6.32-754.63.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debug-0:2.6.32-754.63.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debug-0:2.6.32-754.63.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debug-debuginfo-0:2.6.32-754.63.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debug-debuginfo-0:2.6.32-754.63.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debug-debuginfo-0:2.6.32-754.63.1.el6.x86_64 | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debug-devel-0:2.6.32-754.63.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debug-devel-0:2.6.32-754.63.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debug-devel-0:2.6.32-754.63.1.el6.x86_64 | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debuginfo-0:2.6.32-754.63.1.el6.i686 | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debuginfo-0:2.6.32-754.63.1.el6.s390x | — |
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debuginfo-0:2.6.32-754.63.1.el6.x86_64 | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debuginfo-common-i686-0:2.6.32-754.63.1.el6.i686 | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debuginfo-common-s390x-0:2.6.32-754.63.1.el6.s390x | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-debuginfo-common-x86_64-0:2.6.32-754.63.1.el6.x86_64 | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-devel-0:2.6.32-754.63.1.el6.i686 | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-devel-0:2.6.32-754.63.1.el6.s390x | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-devel-0:2.6.32-754.63.1.el6.x86_64 | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-doc-0:2.6.32-754.63.1.el6.noarch | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-firmware-0:2.6.32-754.63.1.el6.noarch | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-kdump-0:2.6.32-754.63.1.el6.s390x | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-kdump-debuginfo-0:2.6.32-754.63.1.el6.s390x | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:kernel-kdump-devel-0:2.6.32-754.63.1.el6.s390x | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:perf-0:2.6.32-754.63.1.el6.i686 | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:perf-0:2.6.32-754.63.1.el6.s390x | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:perf-0:2.6.32-754.63.1.el6.x86_64 | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:perf-debuginfo-0:2.6.32-754.63.1.el6.i686 | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:perf-debuginfo-0:2.6.32-754.63.1.el6.s390x | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:perf-debuginfo-0:2.6.32-754.63.1.el6.x86_64 | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:python-perf-debuginfo-0:2.6.32-754.63.1.el6.i686 | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:python-perf-debuginfo-0:2.6.32-754.63.1.el6.s390x | — |
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fix
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| Unresolved product id: 6Server-ELS.EXTENSION:python-perf-debuginfo-0:2.6.32-754.63.1.el6.x86_64 | — |
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fix
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:kernel-debug-debuginfo-0:2.6.32-754.63.1.el6.i686 | — |
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fix
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:kernel-debug-debuginfo-0:2.6.32-754.63.1.el6.s390x | — |
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fix
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:kernel-debug-debuginfo-0:2.6.32-754.63.1.el6.x86_64 | — |
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fix
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:kernel-debuginfo-0:2.6.32-754.63.1.el6.i686 | — |
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fix
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:kernel-debuginfo-0:2.6.32-754.63.1.el6.s390x | — |
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fix
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:kernel-debuginfo-0:2.6.32-754.63.1.el6.x86_64 | — |
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fix
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|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:kernel-debuginfo-common-i686-0:2.6.32-754.63.1.el6.i686 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:kernel-debuginfo-common-s390x-0:2.6.32-754.63.1.el6.s390x | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:kernel-debuginfo-common-x86_64-0:2.6.32-754.63.1.el6.x86_64 | — |
Vendor Fix
fix
Workaround
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:kernel-kdump-debuginfo-0:2.6.32-754.63.1.el6.s390x | — |
Vendor Fix
fix
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:perf-debuginfo-0:2.6.32-754.63.1.el6.i686 | — |
Vendor Fix
fix
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:perf-debuginfo-0:2.6.32-754.63.1.el6.s390x | — |
Vendor Fix
fix
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:perf-debuginfo-0:2.6.32-754.63.1.el6.x86_64 | — |
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fix
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:python-perf-0:2.6.32-754.63.1.el6.i686 | — |
Vendor Fix
fix
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:python-perf-0:2.6.32-754.63.1.el6.s390x | — |
Vendor Fix
fix
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| Unresolved product id: 6Server-optional-ELS.EXTENSION:python-perf-0:2.6.32-754.63.1.el6.x86_64 | — |
Vendor Fix
fix
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|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:python-perf-debuginfo-0:2.6.32-754.63.1.el6.i686 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:python-perf-debuginfo-0:2.6.32-754.63.1.el6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 6Server-optional-ELS.EXTENSION:python-perf-debuginfo-0:2.6.32-754.63.1.el6.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
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)
Affected products
Fixed
56 products, the same list as for
CVE-2026-68121
Threats
Impact
Important
References
16 references
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"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s PPPoE (Point-to-Point Protocol over Ethernet) implementation. This vulnerability occurs because a pointer to network packet data is not updated after memory is reallocated, leading to the use of an outdated memory address. An attacker with local access could potentially trigger this condition, causing memory corruption. This could result in a system crash (denial of service) or other unpredictable system behavior.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: pppoe: reload header pointer after dev_hard_header()",
"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"
}
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-68121"
},
{
"category": "external",
"summary": "RHBZ#2513233",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513233"
},
{
"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-2026-68121",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-68121"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-68121",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68121"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026081056-CVE-2026-68121-b20f@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026081056-CVE-2026-68121-b20f@gregkh/T"
}
],
"release_date": "2026-08-10T11:58:41.489000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-09-24T16:06:02+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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"url": "https://access.redhat.com/errata/RHSA-2026:71649"
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: pppoe: reload header pointer after dev_hard_header()"
},
{
"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": {
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"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": "2026-09-24T16:06:02+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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"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"
},
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "kernel: xfrm: ah6: validate routing header segments_left"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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.
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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.
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