CVE-2026-80636
netfilter: conntrack: revert ct extension genid infrastructure
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Aug 28, 2026 |
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Affected Versions
Linux / Linux
c56716c69ce1ac320432fb1ea5654196ba24d2f8 < 6bba4846f196d081bf553391d12b5a73dcc48685 c56716c69ce1ac320432fb1ea5654196ba24d2f8 < 61eab1d0237eb513fe73e391a5926ee70092c325 c56716c69ce1ac320432fb1ea5654196ba24d2f8 < d53eecbca16f056abba274075cb15120ab062518 c56716c69ce1ac320432fb1ea5654196ba24d2f8 < a052a94bcc629acaecc2ce42a4af77f8fa399757 c56716c69ce1ac320432fb1ea5654196ba24d2f8 < 35e21a4dccc5c255ba59ccfbfeb4629ed21da972
Linux / Linux
5.19
References
git.kernel.org: https://git.kernel.org/stable/c/6bba4846f196d081bf553391d12b5a73dcc48685 git.kernel.org: https://git.kernel.org/stable/c/61eab1d0237eb513fe73e391a5926ee70092c325 git.kernel.org: https://git.kernel.org/stable/c/d53eecbca16f056abba274075cb15120ab062518 git.kernel.org: https://git.kernel.org/stable/c/a052a94bcc629acaecc2ce42a4af77f8fa399757 git.kernel.org: https://git.kernel.org/stable/c/35e21a4dccc5c255ba59ccfbfeb4629ed21da972