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CVE-2026-80636

Unknown

Last modified

CVE-2026-80636 is a vulnerability of currently unknown severity. 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..

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= c56716c69ce1ac320432fb1ea5654196ba24d2f8, < 6bba4846f196d081bf553391d12b5a73dcc48685; >= c56716c69ce1ac320432fb1ea5654196ba24d2f8, < 61eab1d0237eb513fe73e391a5926ee70092c325; >= c56716c69ce1ac320432fb1ea5654196ba24d2f8, < d53eecbca16f056abba274075cb15120ab062518; >= c56716c69ce1ac320432fb1ea5654196ba24d2f8, < a052a94bcc629acaecc2ce42a4af77f8fa399757; >= c56716c69ce1ac320432fb1ea5654196ba24d2f8, < 35e21a4dccc5c255ba59ccfbfeb4629ed21da972
LinuxLinux5.19

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-80636?
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.
How severe is CVE-2026-80636?
Severity scoring for CVE-2026-80636 is pending analysis.
How do I fix CVE-2026-80636?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST