CVE-2026-80845
In the Linux kernel, the following vulnerability has been resolved: xfrm: avoid lock inversion in nat keepalive work nat_keepalive_work() walks the state table while xfrm_state_walk() holds net->xfrm.xfrm_state_lock. Its callback then acquires x->lock, which conflicts with the delete path taking the same locks in reverse order via xfrm_state_delete() and __xfrm_state_delete(). This creates an AB-BA deadlock that is reported by lockdep when a NAT keepalive worker races with SA deletion. Fix this by splitting the keepalive walk into two phases. First, collect the candidate states while the walk holds xfrm_state_lock and take a reference on each state. Then, after the walk completes, process each collected state and acquire x->lock without nesting it under xfrm_state_lock.
Affected versions
Linux kernel versions
6.11
and later are affected. Fixed in
6.12.108,
6.18.49,
7.1.13,
7.2.3,
7.3
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-80845?
CVE-2026-80845 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.11 onward and has been patched in 6.12.108, 6.18.49, 7.1.13 and others. CVE-2026-80845 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-80845?
Yes. CVE-2026-80845 has been patched. Fixed versions include 6.12.108, 6.18.49, 7.1.13 and others. If you are running Linux kernel 6.11 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-80845 actively exploited?
No. CVE-2026-80845 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.