CVE-2026-80636netfilter: conntrack: revert ct extension genid infrastructure
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 28, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from c56716c69ce1ac320432fb1ea5654196ba24d2f8 before 6bba4846f196d081bf553391d12b5a73dcc48685; from c56716c69ce1ac320432fb1ea5654196ba24d2f8 before 61eab1d0237eb513fe73e391a5926ee70092c325; from c56716c69ce1ac320432fb1ea5654196ba24d2f8 before d53eecbca16f056abba274075cb15120ab062518; from c56716c69ce1ac320432fb1ea5654196ba24d2f8 before a052a94bcc629acaecc2ce42a4af77f8fa399757; from c56716c69ce1ac320432fb1ea5654196ba24d2f8 before 35e21a4dccc5c255ba59ccfbfeb4629ed21da972 | CNA record |
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
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.