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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-80845

xfrm: avoid lock inversion in nat keepalive work

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae to < ea09210462316e5235a25eccb11ad0708d86615eaffected
  • f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae to < 5c86c895d1cac81a71ead3005084c6265cf6a7a5affected
  • f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae to < 89ef3a2e1e4682ab82b0455ce113f8c39fb9e50daffected
  • f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae to < a9fa05b7a1246797748d15771052639e0d3cabf1affected
  • f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae to < 763fe700b7c58ad64fe5202c5638848244dd4127affected

Linux Linux

Default version status: affected

  • 6.11affected
  • 0 to < 6.11unaffected
  • 6.12.108 to ≤ 6.12.*unaffected
  • 6.18.49 to ≤ 6.18.*unaffected
  • 7.1.13 to ≤ 7.1.*unaffected
  • 7.2.3 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References