In 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.

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
c56716c69ce1ac320432fb1ea5654196ba24d2f8 affected < 6bba4846f196d081bf553391d12b5a73dcc48685
c56716c69ce1ac320432fb1ea5654196ba24d2f8 affected < 61eab1d0237eb513fe73e391a5926ee70092c325
c56716c69ce1ac320432fb1ea5654196ba24d2f8 affected < d53eecbca16f056abba274075cb15120ab062518
c56716c69ce1ac320432fb1ea5654196ba24d2f8 affected < a052a94bcc629acaecc2ce42a4af77f8fa399757
c56716c69ce1ac320432fb1ea5654196ba24d2f8 affected < 35e21a4dccc5c255ba59ccfbfeb4629ed21da972
Linux Linux affected
Version Status Constraints
5.19 affected —
0 unaffected < 5.19
6.6.145 unaffected ≤ 6.6.*
6.12.97 unaffected ≤ 6.12.*
6.18.40 unaffected ≤ 6.18.*
7.1.5 unaffected ≤ 7.1.*
7.2 unaffected ≤ *

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Workaround

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References
Link Providers
https://git.kernel.org/stable/c/35e21a4dccc5c255ba59ccfbfeb4629ed21da972 cve-icon cve-icon
https://git.kernel.org/stable/c/61eab1d0237eb513fe73e391a5926ee70092c325 cve-icon cve-icon
https://git.kernel.org/stable/c/6bba4846f196d081bf553391d12b5a73dcc48685 cve-icon cve-icon
https://git.kernel.org/stable/c/a052a94bcc629acaecc2ce42a4af77f8fa399757 cve-icon cve-icon
https://git.kernel.org/stable/c/d53eecbca16f056abba274075cb15120ab062518 cve-icon cve-icon
History

Fri, 28 Aug 2026 09:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-476

Fri, 28 Aug 2026 07:30:00 +0000

Type Values Removed Values Added
Description In 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.
Title netfilter: conntrack: revert ct extension genid infrastructure
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-28T06:48:50.241Z

Reserved: 2026-08-26T14:34:25.777Z

Link: CVE-2026-80636

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-28T08:16:48.513

Modified: 2026-08-28T08:16:48.513

Link: CVE-2026-80636

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-28T09:30:18Z

Weaknesses