CVE-2026-74395

RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference

State: Published
Severity: Not scored
Published: Aug 15, 2026
Updated: Aug 17, 2026
Reserved: Aug 15, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	7597385371425febdaa8c6a1da3625d4ffff16f5 to before 6e15b770461eeaa0ff73934922cb670a6a9db04eAffected 7597385371425febdaa8c6a1da3625d4ffff16f5 to before 9be9aca28424228586fe9211c373ebdb826ebb6cAffected 7597385371425febdaa8c6a1da3625d4ffff16f5 to before f345e744b6b087188cde2377da5cbe9713b61353Affected 7597385371425febdaa8c6a1da3625d4ffff16f5 to before 1025dc2f7ba29b04b8687790fa91f9cd1a53141eAffected 7597385371425febdaa8c6a1da3625d4ffff16f5 to before 7921821fc2b19c01588311f6e7468ae5b68b1f61Affected 7597385371425febdaa8c6a1da3625d4ffff16f5 to before 5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989Affected 7597385371425febdaa8c6a1da3625d4ffff16f5 to before 78b9589fda266c71f0f9d0c858d4fa7381a890a5Affected 7597385371425febdaa8c6a1da3625d4ffff16f5 to before 43f8f7946814c8e5f464518246fdbc69b6e32326Affected
LinuxLinux	5.3Affected before 5.3Not affected 5.10.261 through 5.10.Not affected 5.15.212 through 5.15.Not affected 6.1.178 through 6.1.Not affected 6.6.145 through 6.6.Not affected 6.12.97 through 6.12.Not affected 6.18.40 through 6.18.Not affected 7.1.5 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

7597385371425febdaa8c6a1da3625d4ffff16f5 to before 6e15b770461eeaa0ff73934922cb670a6a9db04eAffected
7597385371425febdaa8c6a1da3625d4ffff16f5 to before 9be9aca28424228586fe9211c373ebdb826ebb6cAffected
7597385371425febdaa8c6a1da3625d4ffff16f5 to before f345e744b6b087188cde2377da5cbe9713b61353Affected
7597385371425febdaa8c6a1da3625d4ffff16f5 to before 1025dc2f7ba29b04b8687790fa91f9cd1a53141eAffected
7597385371425febdaa8c6a1da3625d4ffff16f5 to before 7921821fc2b19c01588311f6e7468ae5b68b1f61Affected
7597385371425febdaa8c6a1da3625d4ffff16f5 to before 5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989Affected
7597385371425febdaa8c6a1da3625d4ffff16f5 to before 78b9589fda266c71f0f9d0c858d4fa7381a890a5Affected
7597385371425febdaa8c6a1da3625d4ffff16f5 to before 43f8f7946814c8e5f464518246fdbc69b6e32326Affected

LinuxLinux

5.3Affected
before 5.3Not affected
5.10.261 through 5.10.*Not affected
5.15.212 through 5.15.*Not affected
6.1.178 through 6.1.*Not affected
6.6.145 through 6.6.*Not affected
6.12.97 through 6.12.*Not affected
6.18.40 through 6.18.*Not affected
7.1.5 through 7.1.*Not affected
7.2 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.