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.

Metrics

No CVSS v4.0

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

The EPSS score is 0.00176.

Key SSVC decision points have not yet been added.

Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

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References
Link Providers
https://git.kernel.org/stable/c/1025dc2f7ba29b04b8687790fa91f9cd1a53141e cve-icon cve-icon
https://git.kernel.org/stable/c/43f8f7946814c8e5f464518246fdbc69b6e32326 cve-icon cve-icon
https://git.kernel.org/stable/c/5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989 cve-icon cve-icon
https://git.kernel.org/stable/c/6e15b770461eeaa0ff73934922cb670a6a9db04e cve-icon cve-icon
https://git.kernel.org/stable/c/78b9589fda266c71f0f9d0c858d4fa7381a890a5 cve-icon cve-icon
https://git.kernel.org/stable/c/7921821fc2b19c01588311f6e7468ae5b68b1f61 cve-icon cve-icon
https://git.kernel.org/stable/c/9be9aca28424228586fe9211c373ebdb826ebb6c cve-icon cve-icon
https://git.kernel.org/stable/c/f345e744b6b087188cde2377da5cbe9713b61353 cve-icon cve-icon
History

Sat, 15 Aug 2026 06:15:00 +0000

Type Values Removed Values Added
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.
Title RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-08-15T05:59:07.798Z

Reserved: 2026-08-15T05:44:03.891Z

Link: CVE-2026-74395

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-15T06:22:41.480

Modified: 2026-08-15T06:22:41.480

Link: CVE-2026-74395

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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