Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae before ea09210462316e5235a25eccb11ad0708d86615e; affected f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae before 5c86c895d1cac81a71ead3005084c6265cf6a7a5; affected f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae before 89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d; affected f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae before a9fa05b7a1246797748d15771052639e0d3cabf1; affected f531d13bdfe3f4f084aaa8acae2cb0f02295f5ae before 763fe700b7c58ad64fe5202c5638848244dd4127 |
| Linux / Linux | affected 6.11; unaffected 0 before 6.11; unaffected 6.12.108 through 6.12.*; unaffected 6.18.49 through 6.18.*; unaffected 7.1.13 through 7.1.*; unaffected 7.2.3 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ea09210462316e5235a25eccb11ad0708d86615e
- https://git.kernel.org/stable/c/5c86c895d1cac81a71ead3005084c6265cf6a7a5
- https://git.kernel.org/stable/c/89ef3a2e1e4682ab82b0455ce113f8c39fb9e50d
- https://git.kernel.org/stable/c/a9fa05b7a1246797748d15771052639e0d3cabf1
- https://git.kernel.org/stable/c/763fe700b7c58ad64fe5202c5638848244dd4127