CVE-2026-74395RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference
Updated under an hour ago ()
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In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference MLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT() links event_sub into sub_list before initializing the fields used by the shared error path. If eventfd_ctx_fdget() then fails, the unwind path dereferences event_sub->ev_file in uverbs_uobject_put() and calls subscribe_event_xa_dealloc() with an unset xa_key_level1. subscribe_event_xa_alloc() creates the XA entry exactly once for a given key_level1, on the first occurrence of that key. The unwind path must therefore call subscribe_event_xa_dealloc() exactly once for it as well. Enforce that by adding devx_key_in_sub_list() and calling subscribe_event_xa_dealloc() only when the last matching pending entry is being cleaned up.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 7597385371425febdaa8c6a1da3625d4ffff16f5 builds before 6e15b770461eeaa0ff73934922cb670a6a9db04e; 7597385371425febdaa8c6a1da3625d4ffff16f5 builds before 9be9aca28424228586fe9211c373ebdb826ebb6c; from 7597385371425febdaa8c6a1da3625d4ffff16f5 before f345e744b6b087188cde2377da5cbe9713b61353; 7597385371425febdaa8c6a1da3625d4ffff16f5 builds before 1025dc2f7ba29b04b8687790fa91f9cd1a53141e; 7597385371425febdaa8c6a1da3625d4ffff16f5 builds before 7921821fc2b19c01588311f6e7468ae5b68b1f61; 7597385371425febdaa8c6a1da3625d4ffff16f5 builds before 5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989; 7597385371425febdaa8c6a1da3625d4ffff16f5 builds before 78b9589fda266c71f0f9d0c858d4fa7381a890a5; 7597385371425febdaa8c6a1da3625d4ffff16f5 builds before 43f8f7946814c8e5f464518246fdbc69b6e32326 | CNA record |
References
- https://git.kernel.org/stable/c/6e15b770461eeaa0ff73934922cb670a6a9db04e
- https://git.kernel.org/stable/c/9be9aca28424228586fe9211c373ebdb826ebb6c
- https://git.kernel.org/stable/c/f345e744b6b087188cde2377da5cbe9713b61353
- https://git.kernel.org/stable/c/1025dc2f7ba29b04b8687790fa91f9cd1a53141e
- https://git.kernel.org/stable/c/7921821fc2b19c01588311f6e7468ae5b68b1f61
- https://git.kernel.org/stable/c/5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989
- https://git.kernel.org/stable/c/78b9589fda266c71f0f9d0c858d4fa7381a890a5
- https://git.kernel.org/stable/c/43f8f7946814c8e5f464518246fdbc69b6e32326
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.