Vulnerability-Lookup

RHSA-2026:72059

Vulnerability from csaf_redhat - Published: 2026-09-25 18:55 - Updated: 2026-11-05 15:20

Summary

Red Hat Security Advisory: kernel security update

Severity

Critical

Notes

Topic: An update for kernel is now available for NVIDIA for RHEL 10. Red Hat Product Security has rated this update as having a security impact of Critical. 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: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg (CVE-2025-39964) * kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite (CVE-2026-53266) * kernel: net: ipv6: use-after-free in fib6_rule_suppress due to stale res->rt6 pointer (CVE-2026-74581) 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. Additional Changes: For detailed information on changes in this release, see the NVIDIA for RHEL 10 Release Notes linked from 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.

CVE-2025-39964

A race condition was found in the Linux kernel cryptographic user API, AF_ALG in the way concurrent writes to the same AF_ALG socket are handled. Interleaved data and inconsistent internal socket state may result. A local user could use this flaw to crash the system or corrupt cryptographic operation results, causing a denial of service or data integrity issues.

7.3 (High)


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

CWE-366 - Race Condition within a Thread

Affected products

Fixed 53 products

Product	Version	Remediation
Unresolved product id: 10Base-RHEL-Nvidia:kernel-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-0:6.12.0-231.20.el10nv.src	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-core-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-debug-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-debug-core-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-debug-debuginfo-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-debug-devel-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-debug-devel-matched-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-debug-modules-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-debug-modules-core-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-debug-modules-extra-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-debuginfo-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-devel-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-devel-matched-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-modules-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-modules-core-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-64k-modules-extra-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-abi-stablelists-0:6.12.0-231.20.el10nv.noarch	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-core-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-debug-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-debug-core-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-debug-debuginfo-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-debug-devel-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-debug-devel-matched-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-debug-modules-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-debug-modules-core-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-debug-modules-extra-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-debuginfo-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-debuginfo-common-aarch64-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-devel-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-devel-matched-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-doc-0:6.12.0-231.20.el10nv.noarch	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-modules-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-modules-core-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-modules-extra-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-modules-extra-matched-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-tools-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-tools-debuginfo-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-tools-libs-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-tools-libs-devel-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-uki-virt-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:kernel-uki-virt-addons-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:libperf-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:libperf-debuginfo-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:perf-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:perf-debuginfo-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:python3-perf-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:python3-perf-debuginfo-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:rtla-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:rtla-debuginfo-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:rv-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 10Base-RHEL-Nvidia:rv-debuginfo-0:6.12.0-231.20.el10nv.aarch64	—	Vendor Fix fix Workaround

Threats

Exploit Status CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Impact Moderate

CVE-2026-53266

A flaw was found in the Linux kernel's netfilter bridge ebtables SNAT (Source Network Address Translation) module. This vulnerability allows a local attacker on a system configured with specific bridge netfilter rules to improperly modify underlying memory pages during an ARP (Address Resolution Protocol) sender hardware address rewrite. This could lead to unintended system behavior, a denial of service, or potentially local privilege escalation, where an attacker gains higher access rights than intended.

7.5 (High)


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

CWE-825 - Expired Pointer Dereference

Affected products

Fixed 53 products, the same list as for CVE-2025-39964

Threats

Exploit Status CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Impact Important

CVE-2026-74581

A use-after-free vulnerability was found in the Linux kernel's IPv6 FIB rule lookup path. In fib6_rule_suppress(), when a route is suppressed and released via ip6_rt_put_flags(), the res->rt6 pointer is not cleared. If no later rule supplies a replacement route, fib6_rule_lookup() returns the stale (freed) rt6_info to its caller. The subsequent dst_release() then operates on freed memory, hitting rcuref_put_slowpath(). A local attacker who can configure IPv6 routing/FIB rules could trigger this to cause a denial of service (kernel crash) or potentially escalate privileges.

7.8 (High)


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

CWE-416 - Use After Free

Affected products

Fixed 53 products, the same list as for CVE-2025-39964

Threats

Impact Important

References

23 references

URL	Category
https://access.redhat.com/errata/RHSA-2026:72059	self
https://docs.redhat.com/en/documentation/red_hat_…	external
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=2403545	external
https://bugzilla.redhat.com/show_bug.cgi?id=2485368	external
https://bugzilla.redhat.com/show_bug.cgi?id=2520980	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2025-39964	self
https://bugzilla.redhat.com/show_bug.cgi?id=2403545	external
https://www.cve.org/CVERecord?id=CVE-2025-39964	external
https://nvd.nist.gov/vuln/detail/CVE-2025-39964	external
https://lore.kernel.org/linux-cve-announce/202510…	external
https://www.cisa.gov/known-exploited-vulnerabilit…	external
https://access.redhat.com/security/cve/CVE-2026-53266	self
https://bugzilla.redhat.com/show_bug.cgi?id=2485368	external
https://www.cve.org/CVERecord?id=CVE-2026-53266	external
https://nvd.nist.gov/vuln/detail/CVE-2026-53266	external
https://lore.kernel.org/linux-cve-announce/202606…	external
https://access.redhat.com/security/cve/CVE-2026-74581	self
https://bugzilla.redhat.com/show_bug.cgi?id=2520980	external
https://www.cve.org/CVERecord?id=CVE-2026-74581	external
https://nvd.nist.gov/vuln/detail/CVE-2026-74581	external
https://git.kernel.org/pub/scm/linux/kernel/git/t…	external

JSON

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          "text": "A race condition was found in the Linux kernel cryptographic user API, AF_ALG in the way concurrent writes to the same AF_ALG socket are handled. Interleaved data and inconsistent internal socket state may result. \n\nA local user could use this flaw to crash the system or corrupt cryptographic operation results, causing a denial of service or data integrity issues.",
          "title": "Vulnerability description"
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          "category": "summary",
          "text": "kernel: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The AF_ALG datapath allowed two writers on the same socket, causing request payloads to interleave unpredictably and leaving the per-socket context inconsistent. The fix introduces an exclusive write ownership (ctx-\u003ewrite) so that only one writer can issue sendmsg() at a time, preventing state corruption.",
          "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"
        }
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          "url": "https://lore.kernel.org/linux-cve-announce/2025101334-CVE-2025-39964-7964@gregkh/T"
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          "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
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            "attackVector": "LOCAL",
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            "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": "exploit_status",
          "date": "2026-09-18T00:00:00+00:00",
          "details": "CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
        },
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "kernel: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg"
    },
    {
      "cve": "CVE-2026-53266",
      "cwe": {
        "id": "CWE-825",
        "name": "Expired Pointer Dereference"
      },
      "discovery_date": "2026-06-04T17:29:42.230000+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2485368"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s netfilter bridge ebtables SNAT (Source Network Address Translation) module. This vulnerability allows a local attacker on a system configured with specific bridge netfilter rules to improperly modify underlying memory pages during an ARP (Address Resolution Protocol) sender hardware address rewrite. This could lead to unintended system behavior, a denial of service, or potentially local privilege escalation, where an attacker gains higher access rights than intended.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "An Important flaw in the Linux kernel\u0027s ebtables SNAT target allows a local attacker to achieve privilege escalation, memory corruption, or denial of service. This vulnerability requires specific bridge netfilter rules to be configured, limiting its impact to systems with such specialized network configurations.",
          "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"
        }
      ],
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        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-53266"
        },
        {
          "category": "external",
          "summary": "RHBZ#2485368",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485368"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-53266",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-53266"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-53266",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53266"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026062517-CVE-2026-53266-6162@gregkh/T/#u",
          "url": "https://lore.kernel.org/linux-cve-announce/2026062517-CVE-2026-53266-6162@gregkh/T/#u"
        },
        {
          "category": "external",
          "summary": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
          "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
        }
      ],
      "release_date": "2026-06-01T12:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-25T18:55:22+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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          "restart_required": {
            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:72059"
        },
        {
          "category": "workaround",
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            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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      "threats": [
        {
          "category": "exploit_status",
          "date": "2026-09-18T00:00:00+00:00",
          "details": "CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
        },
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite"
    },
    {
      "cve": "CVE-2026-74581",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
      },
      "discovery_date": "2026-08-21T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2520980"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A use-after-free vulnerability was found in the Linux kernel\u0027s IPv6 FIB rule lookup path. In fib6_rule_suppress(), when a route is suppressed and released via ip6_rt_put_flags(), the res-\u003ert6 pointer is not cleared. If no later rule supplies a replacement route, fib6_rule_lookup() returns the stale (freed) rt6_info to its caller. The subsequent dst_release() then operates on freed memory, hitting rcuref_put_slowpath(). A local attacker who can configure IPv6 routing/FIB rules could trigger this to cause a denial of service (kernel crash) or potentially escalate privileges.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: net: ipv6: use-after-free in fib6_rule_suppress due to stale res-\u003ert6 pointer",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "Red Hat has rated this vulnerability as Important because an unprivileged local user capable of creating new user and network namespaces can acquire the network administrative privileges necessary to configure custom IPv6 routing rules, allowing them to compromise kernel stability or potentially gain elevated privileges. Although policy routing configuration normally requires elevated permissions, the availability of unprivileged user namespaces on default enterprise configurations permits non-root accounts to fulfill this prerequisite in an isolated namespace. Because successful exploitation corrupts kernel memory within the network routing subsystem, the entire host is exposed to system crashes or arbitrary code execution.",
          "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"
        }
      ],
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      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2026-74581"
        },
        {
          "category": "external",
          "summary": "RHBZ#2520980",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520980"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-74581",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-74581"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-74581",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74581"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6aea62e433fe1b586202a5fee8b5807ce635e1d7",
          "url": "https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6aea62e433fe1b586202a5fee8b5807ce635e1d7"
        }
      ],
      "release_date": "2026-08-21T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-25T18:55:22+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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            "category": "none"
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          "url": "https://access.redhat.com/errata/RHSA-2026:72059"
        },
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      "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"
          },
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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: net: ipv6: use-after-free in fib6_rule_suppress due to stale res-\u003ert6 pointer"
    }
  ]
}

CVE-2025-39964 (GCVE-0-2025-39964)

Vulnerability from cvelistv5 – Published: 2025-10-13 13:48 – Updated: 2026-11-10 12:37

Title

crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

Summary

In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, concurrent writes may create inconsistencies in the internal socket state. Disallow this by adding a new ctx->write field that indiciates exclusive ownership for writing.

Severity

7.8 (High)


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

SSVC

Exploitation: active Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-18 00:00 UTC

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6641 records in the last 180 days details

References

10 references

URL	Tags
https://git.kernel.org/stable/c/0f28c4adbc4a97437…
https://git.kernel.org/stable/c/e4c1ec11132ec466f…
https://git.kernel.org/stable/c/1f323a48e9b5ebfe6…
https://git.kernel.org/stable/c/7c4491b5644e3a370…
https://git.kernel.org/stable/c/9aee87da5572b3a14…
https://git.kernel.org/stable/c/45bcf60fe49b37daa…
https://git.kernel.org/stable/c/1b34cbbf4f011a121…
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource
https://cert-portal.siemens.com/productcert/html/…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

12 products

Vendor	Product	Version
Linux	Linux	Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 0f28c4adbc4a97437874c9b669fd7958a8c6d6ce (git) Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < e4c1ec11132ec466f7362a95f36a506ce4dc08c9 (git) Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 1f323a48e9b5ebfe6dc7d130fdf5c3c0e92a07c8 (git) Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 7c4491b5644e3a3708f3dbd7591be0a570135b84 (git) Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 9aee87da5572b3a14075f501752e209801160d3d (git) Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 45bcf60fe49b37daab1acee57b27211ad1574042 (git) Affected: 8ff590903d5fc7f5a0a988c38267a3d08e6393a2 , < 1b34cbbf4f011a121ef7b2d7d6e6920a036d5285 (git)
Linux	Linux	Affected: 2.6.38 Unaffected: 0 , < 2.6.38 (semver) Unaffected: 5.10.245 , ≤ 5.10.* (semver) Unaffected: 5.15.194 , ≤ 5.15.* (semver) Unaffected: 6.1.154 , ≤ 6.1.* (semver) Unaffected: 6.6.108 , ≤ 6.6.* (semver) Unaffected: 6.12.49 , ≤ 6.12.* (semver) Unaffected: 6.16.9 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)	Affected: V3.1.6 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)	Affected: V3.1.7 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)	Affected: V3.1.6 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)	Affected: V3.1.7 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)	Affected: V3.1.6 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)	Affected: V3.1.7 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)	Affected: V3.1.6 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0)	Affected: V3.1.7 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)	Affected: V3.1.6 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0)	Affected: V3.1.7 , < * (custom)

Show details on NVD website

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To clipboard

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      "affected": [
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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            "include/crypto/if_alg.h"
          ],
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              "value": "AV:L - The vulnerability is reached through the AF_ALG socket family via `socket()`/`bind()`/`sendmsg()`/`recvmsg()` syscalls, which requires local system access. There is no remote or adjacent-network path to `af_alg_sendmsg()`.\nAC:L - The attacker controls both sides of the race entirely \u2014 two of its own threads on a socket it owns \u2014 and can force writer A to park deterministically in `af_alg_wait_for_wmem()` by sizing `SO_SNDBUF` and filling it, then wake it on demand with its own `recvmsg()`. The error exit that leaves `cur == 0` is triggered at will with a deliberately faulting user buffer, so no condition is outside the attacker\u0027s control.\nPR:L - `alg_create()`, `alg_bind()` and `alg_setkey()` perform no capability checks whatsoever, so any unprivileged local user \u2014 including one inside a container or unprivileged user namespace \u2014 can open, bind and write to an AF_ALG skcipher/aead socket. The required modules are auto-loaded on demand via `MODULE_ALIAS_NETPROTO(AF_ALG)` and `request_module(\"algif-%s\")`.\nUI:N - The attacking process performs every step itself \u2014 socket creation, bind, and the two concurrent `sendmsg()` calls. No victim action or interaction of any kind is needed.\nS:U - The corruption is confined to kernel heap objects (`struct af_alg_tsgl`/scatterlist and adjacent slab memory) within the same security authority. No hypervisor, IOMMU, or other trust boundary is crossed.\nC:H - The out-of-bounds scatterlist entry is fabricated from kernel list pointers and is subsequently handed to the cipher by `skcipher_recvmsg`/`aead_recvmsg` via `af_alg_pull_tsgl()`, so arbitrary kernel memory is encrypted/decrypted and returned to userspace. This yields a kernel memory disclosure primitive, not merely a pointer leak.\nI:H - `memcpy_from_msg(page_address(sg_page(sg)) + sg-\u003eoffset + sg-\u003elength, msg, len)` on the underflowed scatterlist writes attacker-controlled data of attacker-chosen length to an address derived from attacker-influenceable heap contents. Combined with heap grooming of the 4KB tsgl allocations, this is a controlled kernel write suitable for privilege escalation.\nA:H - Dereferencing `page_address(sg_page(sg))` on a bogus page_link, and the later `put_page()` on that fabricated page, reliably produce an oops/panic or page refcount corruption. Any unprivileged user can trigger this repeatedly, crashing the machine."
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CVE-2026-53266 (GCVE-0-2026-53266)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-09-19 03:56

Title

netfilter: bridge: make ebt_snat ARP rewrite writable

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: make ebt_snat ARP rewrite writable The ebtables SNAT target keeps the Ethernet source address rewrite behind skb_ensure_writable(skb, 0). This is intentional: at the bridge ebtables hooks the Ethernet header is addressed through skb_mac_header()/eth_hdr(), while skb->data points at the Ethernet payload. Asking skb_ensure_writable() for ETH_HLEN bytes would check the payload, not the Ethernet header, and would reintroduce the small packet regression fixed by commit 63137bc5882a. However, the optional ARP sender hardware address rewrite is different. It writes through skb_store_bits() at an offset relative to skb->data: skb_store_bits(skb, sizeof(struct arphdr), info->mac, ETH_ALEN) skb_header_pointer() only safely reads the ARP header; it does not make the later sender hardware address range writable. If that range is still held in a nonlinear skb fragment backed by a splice-imported file page, skb_store_bits() maps the frag page and copies the new MAC address directly into it. Ensure the ARP SHA range is writable before reading the ARP header and before calling skb_store_bits().

Severity

8.8 (High)


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

SSVC

Exploitation: active Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-18 00:00 UTC

CWE

CWE-787 - Out-of-bounds Write

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6641 records in the last 180 days details

References

9 references

URL	Tags
https://git.kernel.org/stable/c/bf84ad7c7a9ede46e…
https://git.kernel.org/stable/c/76280b78cc9f23bdc…
https://git.kernel.org/stable/c/b7e91939ba9be805a…
https://git.kernel.org/stable/c/afd64b59c3de9bbbd…
https://git.kernel.org/stable/c/153ea96c806aea395…
https://git.kernel.org/stable/c/b18675263db1147c8…
https://git.kernel.org/stable/c/c9b5ff59feffb92a1…
https://git.kernel.org/stable/c/67ba971ae02514d85…
https://www.cisa.gov/known-exploited-vulnerabilit…	government-resource

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < bf84ad7c7a9ede46e31afaa41a1ba06a159e8c87 (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < 76280b78cc9f23bdc6438e10ad6dff148ef8375b (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < b7e91939ba9be805a62a257fa4e227dffbb88fa0 (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < afd64b59c3de9bbbdd3759e834fdc55cda716e0b (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < 153ea96c806aea395daba907a4f88480b6ad5093 (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < b18675263db1147c8e1cab625400c13a0d87bd2d (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < c9b5ff59feffb92a147a84a5aa28acd2cb8ff4c5 (git) Affected: 63137bc5882a1882c553d389fdeeeace86ee1741 , < 67ba971ae02514d85818fe0c32549ab4bfa3bf49 (git) Affected: 2f3839075a5f8dcf116c1abe35b36b018ac62445 (git) Affected: 51ba2945a8ef65ae437c8f9ba05f0343aa82ae5b (git) Affected: b7d23c2c87584eb429f115c078ed511be8b18e29 (git) Affected: 5.4.73 , < 5.5 (semver) Affected: 5.8.17 , < 5.9 (semver) Affected: 5.9.2 , < 5.10 (semver)
Linux	Linux	Affected: 5.10 Unaffected: 0 , < 5.10 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: bridge: make ebt_snat ARP rewrite writable\n\nThe ebtables SNAT target keeps the Ethernet source address rewrite\nbehind skb_ensure_writable(skb, 0).  This is intentional: at the bridge\nebtables hooks the Ethernet header is addressed through\nskb_mac_header()/eth_hdr(), while skb-\u003edata points at the Ethernet\npayload.  Asking skb_ensure_writable() for ETH_HLEN bytes would check\nthe payload, not the Ethernet header, and would reintroduce the small\npacket regression fixed by commit 63137bc5882a.\n\nHowever, the optional ARP sender hardware address rewrite is different.\nIt writes through skb_store_bits() at an offset relative to skb-\u003edata:\n\n        skb_store_bits(skb, sizeof(struct arphdr), info-\u003emac, ETH_ALEN)\n\nskb_header_pointer() only safely reads the ARP header; it does not make\nthe later sender hardware address range writable.  If that range is\nstill held in a nonlinear skb fragment backed by a splice-imported file\npage, skb_store_bits() maps the frag page and copies the new MAC address\ndirectly into it.\n\nEnsure the ARP SHA range is writable before reading the ARP header and\nbefore calling skb_store_bits()."
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              "value": "AV:L - Exploitation requires local control of bridge/ebtables configuration and arranging an skb with shared non-linear backing memory; remote ARP traffic alone cannot create the splice-backed page condition.\nAC:L - There is no race or rare external timing condition; the attacker can control the rule, ARP frame layout, and shared-frag setup needed to reach the write.\nPR:L - The ebtables rule path requires CAP_NET_ADMIN, but this is reachable with namespace-local privileges via user/network namespaces rather than requiring init-namespace root.\nUI:N - No victim action is required once the attacker can configure the namespace and send the crafted traffic through the bridge path.\nS:C - The bug can let namespace-local network privileges corrupt file-backed/page-cache memory outside the bridge/netfilter security boundary, plausibly crossing a sandbox or namespace boundary.\nC:H - The shared-page corruption can be leveraged toward privilege escalation or code execution, which can expose high-value system data.\nI:H - skb_store_bits() writes attacker-chosen MAC bytes into shared backing pages, giving a controlled corruption primitive against file-backed memory.\nA:H - Controlled corruption of shared/file-backed pages can damage critical files or executable contents and can be repeated to cause severe system availability impact."
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          "url": "https://git.kernel.org/stable/c/67ba971ae02514d85818fe0c32549ab4bfa3bf49"
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    "datePublished": "2026-06-25T08:39:53.190Z",
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    "dateUpdated": "2026-09-19T03:56:22.274Z",
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CVE-2026-74581 (GCVE-0-2026-74581)

Vulnerability from cvelistv5 – Published: 2026-08-21 16:31 – Updated: 2026-10-16 19:05

Title

net: ipv6: clear suppressed fib6 rule result

Summary

In the Linux kernel, the following vulnerability has been resolved: net: ipv6: clear suppressed fib6 rule result fib6_rule_suppress() drops a suppressed route with ip6_rt_put_flags(), but leaves res->rt6 pointing at the released rt6_info. If no later rule supplies a replacement, fib6_rule_lookup() still sees res.rt6 and returns that stale dst to its caller. A suppressing rule can therefore leak a released route back to rt6_lookup(), and the next put hits rcuref_put_slowpath() from dst_release(). Clear res->rt6 when suppressing the route so suppressed lookups fall through to the null dst instead of reusing the released one.

Severity

9.8 (Critical)


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

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-16 19:01 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6641 records in the last 180 days details

References

8 references

URL	Tags
https://git.kernel.org/stable/c/90c57310e266eb94e…
https://git.kernel.org/stable/c/5d29b286c9de0b309…
https://git.kernel.org/stable/c/354db6243eca59e9d…
https://git.kernel.org/stable/c/6d98c70fe0ba8c770…
https://git.kernel.org/stable/c/9bad152c42b374991…
https://git.kernel.org/stable/c/dc3ab04220667f254…
https://git.kernel.org/stable/c/a341c091ca0bfae37…
https://git.kernel.org/stable/c/6aea62e433fe1b586…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 209d35ee34e25f9668c404350a1c86d914c54ffa , < 90c57310e266eb94e4a80d6b15a9ca131d2e82cb (git) Affected: 8ef8a76a340ebdb2c2eea3f6fb0ebbed09a16383 , < 5d29b286c9de0b309e94b9ed083aa1a2f429434f (git) Affected: cdef485217d30382f3bf6448c54b4401648fe3f1 , < 354db6243eca59e9d187ffbf8b7955b044ce84dc (git) Affected: cdef485217d30382f3bf6448c54b4401648fe3f1 , < 6d98c70fe0ba8c7708bfd5b2a5174d2086775daa (git) Affected: cdef485217d30382f3bf6448c54b4401648fe3f1 , < 9bad152c42b37499162367fe47867411e62fffa3 (git) Affected: cdef485217d30382f3bf6448c54b4401648fe3f1 , < dc3ab04220667f254f4348572b2a0b3febff89fb (git) Affected: cdef485217d30382f3bf6448c54b4401648fe3f1 , < a341c091ca0bfae377747b1b59a3bd8ebe18a937 (git) Affected: cdef485217d30382f3bf6448c54b4401648fe3f1 , < 6aea62e433fe1b586202a5fee8b5807ce635e1d7 (git) Affected: ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29 (git) Affected: 5.10.84 , < 5.10.265 (semver) Affected: 5.15.7 , < 5.15.216 (semver) Affected: 5.4.164 , < 5.5 (semver)
Linux	Linux	Affected: 5.16 Unaffected: 0 , < 5.16 (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)

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JSON

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{
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      {
        "metrics": [
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              "content": {
                "id": "CVE-2026-74581",
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            {
              "status": "affected",
              "version": "ee38eb8cf9a7323884c2b8e0adbbeb2192d31e29",
              "versionType": "git"
            },
            {
              "lessThan": "5.10.265",
              "status": "affected",
              "version": "5.10.84",
              "versionType": "semver"
            },
            {
              "lessThan": "5.15.216",
              "status": "affected",
              "version": "5.15.7",
              "versionType": "semver"
            },
            {
              "lessThan": "5.5",
              "status": "affected",
              "version": "5.4.164",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv6/fib6_rules.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.151",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.103",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.265",
                  "versionStartIncluding": "5.10.84",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.216",
                  "versionStartIncluding": "5.15.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.151",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.103",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.44",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.4.164",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ipv6: clear suppressed fib6 rule result\n\nfib6_rule_suppress() drops a suppressed route with ip6_rt_put_flags(),\nbut leaves res-\u003ert6 pointing at the released rt6_info.\n\nIf no later rule supplies a replacement, fib6_rule_lookup() still sees\nres.rt6 and returns that stale dst to its caller. A suppressing rule can\ntherefore leak a released route back to rt6_lookup(), and the next put\nhits rcuref_put_slowpath() from dst_release().\n\nClear res-\u003ert6 when suppressing the route so suppressed lookups fall\nthrough to the null dst instead of reusing the released one."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - fib6_rule_suppress() runs on every IPv6 route lookup via fib6_rule_lookup(), including ip6_route_input() for received packets and icmp6/icmpv6 redirect handlers; WireGuard/VPN servers commonly deploy suppress_prefixlength rules (wg-quick), so remote IPv6 traffic to those hosts reaches the bug.\nAC:L - Once suppress_prefixlength IPv6 policy routing rules exist, any matching packet deterministically triggers fib6_rule_suppress() to release the route while leaving a stale res-\u003ert6 pointer; no race or uncontrollable memory layout is required.\nPR:N - Remote exploitation needs only the ability to send IPv6 packets through a host whose operator already configured suppress rules (e.g., wg-quick); CAP_NET_ADMIN is an admin deployment prerequisite, not attacker privilege on the target.\nUI:N - No victim action is required beyond normal delivery of attacker-generated IPv6 traffic (or ICMPv6 redirect) to a host performing policy-route lookup.\nS:U - The stale rt6_info/dst_entry UAF corrupts kernel heap memory within the same host security boundary; it is not a VM escape or cross-authority sandbox break.\nC:H - Returning a released rt6_info leaves a dangling dst_entry in ip6_dst_cache; subsequent reads through ip6_dst_idev(), dst metrics, or error paths are classic slab UAF with attacker-influencable heap reuse via sustained IPv6 traffic.\nI:H - Double-free/imbalanced rcuref put and post-free use of rt6_info fields give heap corruption primitives; UAF on dst/route cache objects is routinely leveraged for kernel write and control-flow hijack.\nA:H - Commit explicitly reports rcuref_put_slowpath() WARN from dst_release() on the freed route; UAF and refcount corruption can oops/panic the kernel, fully denying availability."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:40:07.594Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/90c57310e266eb94e4a80d6b15a9ca131d2e82cb"
        },
        {
          "url": "https://git.kernel.org/stable/c/5d29b286c9de0b309e94b9ed083aa1a2f429434f"
        },
        {
          "url": "https://git.kernel.org/stable/c/354db6243eca59e9d187ffbf8b7955b044ce84dc"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d98c70fe0ba8c7708bfd5b2a5174d2086775daa"
        },
        {
          "url": "https://git.kernel.org/stable/c/9bad152c42b37499162367fe47867411e62fffa3"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc3ab04220667f254f4348572b2a0b3febff89fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/a341c091ca0bfae377747b1b59a3bd8ebe18a937"
        },
        {
          "url": "https://git.kernel.org/stable/c/6aea62e433fe1b586202a5fee8b5807ce635e1d7"
        }
      ],
      "title": "net: ipv6: clear suppressed fib6 rule result",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74581",
    "datePublished": "2026-08-21T16:31:54.683Z",
    "dateReserved": "2026-08-15T05:44:03.918Z",
    "dateUpdated": "2026-10-16T19:05:58.061Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.

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-2026:72059

CVE-2025-39964 (GCVE-0-2025-39964)

CVE-2026-53266 (GCVE-0-2026-53266)

CVE-2026-74581 (GCVE-0-2026-74581)

Tags

Sightings

Nomenclature

Vulnerability timeline

Related by attack behaviour