netfilter: conntrack: revert ct extension genid infrastructure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-80636
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:48 UTC
Updated2026-08-28 08:16:48 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: revert ct extension genid infrastructure This infrastructure is not used anymore after moving ct timeout and helper to use datapath refcount to track object use. Revert commit c56716c69ce1 ("netfilter: extensions: introduce extension genid count") this patch disables all ct extensions (leading to NULL) for unconfirmed conntracks, when this is only targeted at ct helper and ct timeout. There is also codebase that dereferences the ct extension without checking for NULL which could lead to crash.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.062770000 (date 2026-08-30)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c56716c69ce1ac320432fb1ea5654196ba24d2f8 6bba4846f196d081bf553391d12b5a73dcc48685 git Not specified
CNA Linux Linux affected c56716c69ce1ac320432fb1ea5654196ba24d2f8 61eab1d0237eb513fe73e391a5926ee70092c325 git Not specified
CNA Linux Linux affected c56716c69ce1ac320432fb1ea5654196ba24d2f8 d53eecbca16f056abba274075cb15120ab062518 git Not specified
CNA Linux Linux affected c56716c69ce1ac320432fb1ea5654196ba24d2f8 a052a94bcc629acaecc2ce42a4af77f8fa399757 git Not specified
CNA Linux Linux affected c56716c69ce1ac320432fb1ea5654196ba24d2f8 35e21a4dccc5c255ba59ccfbfeb4629ed21da972 git Not specified
CNA Linux Linux affected 5.19 Not specified
CNA Linux Linux unaffected 5.19 semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6bba4846f196d081bf553391d12b5a73dcc48685 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/61eab1d0237eb513fe73e391a5926ee70092c325 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a052a94bcc629acaecc2ce42a4af77f8fa399757 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d53eecbca16f056abba274075cb15120ab062518 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/35e21a4dccc5c255ba59ccfbfeb4629ed21da972 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

© CVE.report 2026

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report