RHSA-2026:44230

Vulnerability from csaf_redhat - Published: 2026-07-29 13:25 - Updated: 2026-07-31 20:40
Summary
Red Hat Security Advisory: OpenShift Container Platform 4.18.50 bug fix and security update
Severity
Important
Notes
Topic: Red Hat OpenShift Container Platform release 4.18.50 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 4.18. 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. 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/4.18/html/release_notes/ Security Fix(es): * kernel: netfilter: flowtable: strictly check for maximum number of actions (CVE-2026-43329) * kernel: Linux kernel: Use-After-Free in net/gro due to improper handling of zerocopy skbs (CVE-2026-46323) * kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role (CVE-2026-53359) 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 4.18 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/4.18/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-2026-43329

A flaw was found in the Netfilter flowtable component of the Linux kernel. This vulnerability occurs because the system does not strictly check the maximum number of hardware offload actions for IPv6, allowing it to process more actions than supported. This could potentially lead to system instability or a denial of service (DoS) condition, where the affected system becomes unresponsive.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-770 - Allocation of Resources Without Limits or Throttling
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.18:rhcos-aarch64-418.94.202607211754-0 —
Vendor Fix fix
Unresolved product id: 9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202607211754-0 —
Vendor Fix fix
Unresolved product id: 9Base-RHOSE-4.18:rhcos-s390x-418.94.202607211754-0 —
Vendor Fix fix
Unresolved product id: 9Base-RHOSE-4.18:rhcos-x86_64-418.94.202607211754-0 —
Vendor Fix fix
Threats
Impact Important
CVE-2026-46323

A flaw was found in the Linux kernel's Generic Receive Offload (GRO) networking subsystem. This vulnerability occurs when `skb_gro_receive()` attempts to merge zerocopy socket buffers (skbs) without properly managing page reference counts, specifically when the `SKBFL_MANAGED_FRAG_REFS` flag is set. An attacker could potentially exploit this to trigger a Use-After-Free (UAF) condition, which is a memory corruption vulnerability that can lead to system instability or potentially arbitrary code execution.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-123 - Write-what-where Condition
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.18:rhcos-aarch64-418.94.202607211754-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202607211754-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.18:rhcos-s390x-418.94.202607211754-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.18:rhcos-x86_64-418.94.202607211754-0 —
Vendor Fix fix
Workaround
Threats
Impact Important
CVE-2026-53359

A flaw was found in the Linux kernel's Kernel-based Virtual Machine (KVM) x86 shadow paging mechanism. This vulnerability occurs when a host page directory entry (PDE) mapping is changed from within the guest, leading to an unexpected role mismatch in shadow paging. This mismatch can cause a use-after-free condition, where the system attempts to access memory that has already been released. Such a condition can lead to system instability, denial of service, potentially the execution of arbitrary code or guest-to-host escape.

7.8 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Product Identifier Version Remediation
Unresolved product id: 9Base-RHOSE-4.18:rhcos-aarch64-418.94.202607211754-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202607211754-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.18:rhcos-s390x-418.94.202607211754-0 —
Vendor Fix fix
Workaround
Unresolved product id: 9Base-RHOSE-4.18:rhcos-x86_64-418.94.202607211754-0 —
Vendor Fix fix
Workaround
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:44230 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2468124 external
https://bugzilla.redhat.com/show_bug.cgi?id=2479832 external
https://bugzilla.redhat.com/show_bug.cgi?id=2497033 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2026-43329 self
https://bugzilla.redhat.com/show_bug.cgi?id=2468124 external
https://www.cve.org/CVERecord?id=CVE-2026-43329 external
https://nvd.nist.gov/vuln/detail/CVE-2026-43329 external
https://git.kernel.org/pub/scm/linux/security/vul… external
https://access.redhat.com/security/cve/CVE-2026-46323 self
https://bugzilla.redhat.com/show_bug.cgi?id=2479832 external
https://www.cve.org/CVERecord?id=CVE-2026-46323 external
https://nvd.nist.gov/vuln/detail/CVE-2026-46323 external
https://git.kernel.org/pub/scm/linux/kernel/git/s… external
https://git.kernel.org/pub/scm/linux/kernel/git/s… external
https://git.kernel.org/pub/scm/linux/kernel/git/s… external
https://git.kernel.org/pub/scm/linux/kernel/git/s… external
https://git.kernel.org/pub/scm/linux/kernel/git/s… external
https://lore.kernel.org/netdev/4d583fc5401298453d… external
https://lore.kernel.org/netdev/agVpIsaSherjHTYg@s… external
https://access.redhat.com/security/cve/CVE-2026-53359 self
https://bugzilla.redhat.com/show_bug.cgi?id=2497033 external
https://www.cve.org/CVERecord?id=CVE-2026-53359 external
https://nvd.nist.gov/vuln/detail/CVE-2026-53359 external
https://lore.kernel.org/linux-cve-announce/202607… external
https://www.openwall.com/lists/oss-security/2026/… external
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          "details": "For OpenShift Container Platform 4.18 see the following documentation,\nwhich will be updated shortly for this release, for important instructions\non how to upgrade your cluster and fully apply this asynchronous errata\nupdate:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata\nfor x86_64, s390x, ppc64le, and aarch64 architectures. The image digests\nmay be found at\nhttps://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 sha256:06c81645f1c2c36c637297d2b2bfc9f0441ae4b78e88e8f2e9f67879a4ceddeb\n\n      (For s390x architecture)\n      The image digest is sha256:fae2a08a585617518ca1b3a5d37eb43e1b77215390223a6658bf766472b09e29\n\n      (For ppc64le architecture)\n      The image digest is sha256:6c3bfbee4e48e56b6f0cad979e81445af095e99ebb6da0fa7d0009be26724969\n\n      (For aarch64 architecture)\n      The image digest is sha256:95179a9a06cd4be07272fdef8276105d5d6edaa88f5ac6c28a8674e2bd2e993e\n\nAll OpenShift Container Platform 4.18 users are advised to upgrade to these\nupdated packages and images when they are available in the appropriate\nrelease channel. To check for available updates, use the OpenShift CLI (oc)\nor web console. Instructions for upgrading a cluster are available at\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html-single/updating_clusters/index#updating-cluster-cli.",
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            "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"
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            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202607211754-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: netfilter: flowtable: strictly check for maximum number of actions"
    },
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      "cwe": {
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      },
      "discovery_date": "2026-05-19T11:49:44.372000+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2479832"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s Generic Receive Offload (GRO) networking subsystem. This vulnerability occurs when `skb_gro_receive()` attempts to merge zerocopy socket buffers (skbs) without properly managing page reference counts, specifically when the `SKBFL_MANAGED_FRAG_REFS` flag is set. An attacker could potentially exploit this to trigger a Use-After-Free (UAF) condition, which is a memory corruption vulnerability that can lead to system instability or potentially arbitrary code execution.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: Linux kernel: Use-After-Free in net/gro due to improper handling of zerocopy skbs",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important flaw in the Linux kernel\u0027s Generic Receive Offload (GRO) networking subsystem. The vulnerability, a variant of Fragnesia, stems from improper management of page reference counts when merging zerocopy socket buffers. An attacker could exploit this Use-After-Free condition to achieve arbitrary code execution or cause system instability on affected Red Hat Enterprise Linux and OpenShift Container Platform systems.",
          "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-4.18:rhcos-aarch64-418.94.202607211754-0",
          "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202607211754-0",
          "9Base-RHOSE-4.18:rhcos-s390x-418.94.202607211754-0",
          "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202607211754-0"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-46323"
        },
        {
          "category": "external",
          "summary": "RHBZ#2479832",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2479832"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-46323",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-46323"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-46323",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46323"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=1f9c828556416fbe3f49386708ce999fc4d4da06",
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=1f9c828556416fbe3f49386708ce999fc4d4da06"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=44bea2032af0425e4ce6d26a8af0ede79db49ec1",
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=44bea2032af0425e4ce6d26a8af0ede79db49ec1"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=479084ae0e1d9cb7929cb4298d35623de189f80a",
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=479084ae0e1d9cb7929cb4298d35623de189f80a"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4db79a322db8c97f7b73b8a347395ef4d685eb40",
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=4db79a322db8c97f7b73b8a347395ef4d685eb40"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e334cbf3388fd9334503a778a82d9e9f14dd2f71",
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e334cbf3388fd9334503a778a82d9e9f14dd2f71"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/netdev/4d583fc5401298453d0a2f1b4719a15be30c8e49.1779194090.git.sd@queasysnail.net/",
          "url": "https://lore.kernel.org/netdev/4d583fc5401298453d0a2f1b4719a15be30c8e49.1779194090.git.sd@queasysnail.net/"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/netdev/agVpIsaSherjHTYg@sultan-box/",
          "url": "https://lore.kernel.org/netdev/agVpIsaSherjHTYg@sultan-box/"
        }
      ],
      "release_date": "2026-05-19T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-29T13:25:36+00:00",
          "details": "For OpenShift Container Platform 4.18 see the following documentation,\nwhich will be updated shortly for this release, for important instructions\non how to upgrade your cluster and fully apply this asynchronous errata\nupdate:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata\nfor x86_64, s390x, ppc64le, and aarch64 architectures. The image digests\nmay be found at\nhttps://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 sha256:06c81645f1c2c36c637297d2b2bfc9f0441ae4b78e88e8f2e9f67879a4ceddeb\n\n      (For s390x architecture)\n      The image digest is sha256:fae2a08a585617518ca1b3a5d37eb43e1b77215390223a6658bf766472b09e29\n\n      (For ppc64le architecture)\n      The image digest is sha256:6c3bfbee4e48e56b6f0cad979e81445af095e99ebb6da0fa7d0009be26724969\n\n      (For aarch64 architecture)\n      The image digest is sha256:95179a9a06cd4be07272fdef8276105d5d6edaa88f5ac6c28a8674e2bd2e993e\n\nAll OpenShift Container Platform 4.18 users are advised to upgrade to these\nupdated packages and images when they are available in the appropriate\nrelease channel. To check for available updates, use the OpenShift CLI (oc)\nor web console. Instructions for upgrading a cluster are available at\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html-single/updating_clusters/index#updating-cluster-cli.",
          "product_ids": [
            "9Base-RHOSE-4.18:rhcos-aarch64-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202607211754-0"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:44230"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.",
          "product_ids": [
            "9Base-RHOSE-4.18:rhcos-aarch64-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202607211754-0"
          ]
        }
      ],
      "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-4.18:rhcos-aarch64-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202607211754-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: Linux kernel: Use-After-Free in net/gro due to improper handling of zerocopy skbs"
    },
    {
      "cve": "CVE-2026-53359",
      "cwe": {
        "id": "CWE-825",
        "name": "Expired Pointer Dereference"
      },
      "discovery_date": "2026-07-04T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2497033"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s Kernel-based Virtual Machine (KVM) x86 shadow paging mechanism. This vulnerability occurs when a host page directory entry (PDE) mapping is changed from within the guest, leading to an unexpected role mismatch in shadow paging. This mismatch can cause a use-after-free condition, where the system attempts to access memory that has already been released. Such a condition can lead to system instability, denial of service, potentially the execution of arbitrary code or guest-to-host escape.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important flaw in the KVM x86 shadow paging mechanism where an attacker with privileged access inside the guest VM could trigger a use-after-free condition by manipulating page directory entries on the host. This could lead to system instability, denial of service, or potentially arbitrary code execution on the host.\n\nIn Red Hat Enterprise Linux 7, nested virtualization for KVM is a Technology Preview feature and the nested parameter defaults to 0 (disabled) for both kvm_intel and kvm_amd.",
          "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-4.18:rhcos-aarch64-418.94.202607211754-0",
          "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202607211754-0",
          "9Base-RHOSE-4.18:rhcos-s390x-418.94.202607211754-0",
          "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202607211754-0"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-53359"
        },
        {
          "category": "external",
          "summary": "RHBZ#2497033",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2497033"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-53359",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-53359"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-53359",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53359"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026070403-CVE-2026-53359-4f57@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2026070403-CVE-2026-53359-4f57@gregkh/T"
        },
        {
          "category": "external",
          "summary": "https://www.openwall.com/lists/oss-security/2026/07/06/7",
          "url": "https://www.openwall.com/lists/oss-security/2026/07/06/7"
        }
      ],
      "release_date": "2026-07-04T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-29T13:25:36+00:00",
          "details": "For OpenShift Container Platform 4.18 see the following documentation,\nwhich will be updated shortly for this release, for important instructions\non how to upgrade your cluster and fully apply this asynchronous errata\nupdate:\n\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html/release_notes/\n\nYou may download the oc tool and use it to inspect release image metadata\nfor x86_64, s390x, ppc64le, and aarch64 architectures. The image digests\nmay be found at\nhttps://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 sha256:06c81645f1c2c36c637297d2b2bfc9f0441ae4b78e88e8f2e9f67879a4ceddeb\n\n      (For s390x architecture)\n      The image digest is sha256:fae2a08a585617518ca1b3a5d37eb43e1b77215390223a6658bf766472b09e29\n\n      (For ppc64le architecture)\n      The image digest is sha256:6c3bfbee4e48e56b6f0cad979e81445af095e99ebb6da0fa7d0009be26724969\n\n      (For aarch64 architecture)\n      The image digest is sha256:95179a9a06cd4be07272fdef8276105d5d6edaa88f5ac6c28a8674e2bd2e993e\n\nAll OpenShift Container Platform 4.18 users are advised to upgrade to these\nupdated packages and images when they are available in the appropriate\nrelease channel. To check for available updates, use the OpenShift CLI (oc)\nor web console. Instructions for upgrading a cluster are available at\nhttps://docs.redhat.com/en/documentation/openshift_container_platform/4.18/html-single/updating_clusters/index#updating-cluster-cli.",
          "product_ids": [
            "9Base-RHOSE-4.18:rhcos-aarch64-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202607211754-0"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2026:44230"
        },
        {
          "category": "workaround",
          "details": "This vulnerability can be mitigated by disabling nested virtualization. Create a file in `/etc/modprobe.d/` with a descriptive name, such as `cve-2026-53359-mitigation.conf`. In that file, disable nested virtualization for the `kvm_intel` and `kvm_amd` kernel modules:\n```\noptions kvm-intel nested=0\noptions kvm-amd nested=0\n```\n\nUse `lsmod` to determine if either module is already loaded. If so, remove loaded modules with `modprobe -r`. To validate that nested virtualization is disabled, read the files `/sys/module/kvm_intel/parameters/nested` and `/sys/module/kvm_amd/parameters/nested`. If these modules are loaded, those files should read `N` to indicate that the feature is disabled.\n\nIn OpenShift 4, a MachineConfig can be utilized to create a modprobe configuration allowing control of the module on applicable nodes. See the following article for an example.\n\nhttps://access.redhat.com/solutions/6979679",
          "product_ids": [
            "9Base-RHOSE-4.18:rhcos-aarch64-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202607211754-0"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "9Base-RHOSE-4.18:rhcos-aarch64-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-ppc64le-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-s390x-418.94.202607211754-0",
            "9Base-RHOSE-4.18:rhcos-x86_64-418.94.202607211754-0"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role"
    }
  ]
}



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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.