CVE-2026-80636
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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
Propose a mitigation on Community Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
References
- https://git.kernel.org/stable/c/6bba4846f196d081bf553391d12b5a73dcc48685
- https://git.kernel.org/stable/c/61eab1d0237eb513fe73e391a5926ee70092c325
- https://git.kernel.org/stable/c/d53eecbca16f056abba274075cb15120ab062518
- https://git.kernel.org/stable/c/a052a94bcc629acaecc2ce42a4af77f8fa399757
- https://git.kernel.org/stable/c/35e21a4dccc5c255ba59ccfbfeb4629ed21da972
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.