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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74395
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:22:41 UTC
Updated2026-08-15 06:22:41 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7597385371425febdaa8c6a1da3625d4ffff16f5 6e15b770461eeaa0ff73934922cb670a6a9db04e git Not specified
CNA Linux Linux affected 7597385371425febdaa8c6a1da3625d4ffff16f5 9be9aca28424228586fe9211c373ebdb826ebb6c git Not specified
CNA Linux Linux affected 7597385371425febdaa8c6a1da3625d4ffff16f5 f345e744b6b087188cde2377da5cbe9713b61353 git Not specified
CNA Linux Linux affected 7597385371425febdaa8c6a1da3625d4ffff16f5 1025dc2f7ba29b04b8687790fa91f9cd1a53141e git Not specified
CNA Linux Linux affected 7597385371425febdaa8c6a1da3625d4ffff16f5 7921821fc2b19c01588311f6e7468ae5b68b1f61 git Not specified
CNA Linux Linux affected 7597385371425febdaa8c6a1da3625d4ffff16f5 5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989 git Not specified
CNA Linux Linux affected 7597385371425febdaa8c6a1da3625d4ffff16f5 78b9589fda266c71f0f9d0c858d4fa7381a890a5 git Not specified
CNA Linux Linux affected 7597385371425febdaa8c6a1da3625d4ffff16f5 43f8f7946814c8e5f464518246fdbc69b6e32326 git Not specified
CNA Linux Linux affected 5.3 Not specified
CNA Linux Linux unaffected 5.3 semver Not specified
CNA Linux Linux unaffected 5.10.261 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.212 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.178 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.145 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.97 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.40 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/43f8f7946814c8e5f464518246fdbc69b6e32326 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/6e15b770461eeaa0ff73934922cb670a6a9db04e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1025dc2f7ba29b04b8687790fa91f9cd1a53141e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9be9aca28424228586fe9211c373ebdb826ebb6c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f345e744b6b087188cde2377da5cbe9713b61353 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7921821fc2b19c01588311f6e7468ae5b68b1f61 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/78b9589fda266c71f0f9d0c858d4fa7381a890a5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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