What is CVE-2026-80636?

CVE-2026-80636 is a unscored severity Linux kernel vulnerability, affecting Linux kernel versions from 5.19 onward and patched in 6.6.145, 6.12.97, 6.18.40 and others. CVE-2026-80636 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-80636?

CVE-2026-80636 has a CVSS score of pending NVD analysis out of 10, rated awaiting scoring severity.

Is there a patch available for CVE-2026-80636?

Yes, CVE-2026-80636 has been patched. Fixed versions include 6.6.145, 6.12.97, 6.18.40 and others. If you are running Linux kernel 5.19 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-80636 actively exploited?

CVE-2026-80636 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

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.

Package Linux Kernel

Published 2026-08-28

Last modified 2026-08-28

Patch available

Yes

Affected versions

Linux kernel versions 5.19 and later are affected. Fixed in 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2 and their respective stable series.

Affected from

≥ 5.19

Fixed in

✓ 6.6.145 6.6.x ✓ 6.12.97 6.12.x ✓ 6.18.40 6.18.x ✓ 7.1.5 7.1.x ✓ 7.2

References

5 total

Frequently asked questions

What is CVE-2026-80636?

CVE-2026-80636 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.19 onward and has been patched in 6.6.145, 6.12.97, 6.18.40 and others. CVE-2026-80636 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
Is there a patch available for CVE-2026-80636?

Yes. CVE-2026-80636 has been patched. Fixed versions include 6.6.145, 6.12.97, 6.18.40 and others. If you are running Linux kernel 5.19 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-80636 actively exploited?

No. CVE-2026-80636 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.