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CVE-2026-74395

UnknownEPSS 0.18%

Last modified

CVE-2026-74395 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability
0.18%

7.5th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 7597385371425febdaa8c6a1da3625d4ffff16f5, < 6e15b770461eeaa0ff73934922cb670a6a9db04e; >= 7597385371425febdaa8c6a1da3625d4ffff16f5, < 9be9aca28424228586fe9211c373ebdb826ebb6c; >= 7597385371425febdaa8c6a1da3625d4ffff16f5, < f345e744b6b087188cde2377da5cbe9713b61353; >= 7597385371425febdaa8c6a1da3625d4ffff16f5, < 1025dc2f7ba29b04b8687790fa91f9cd1a53141e; >= 7597385371425febdaa8c6a1da3625d4ffff16f5, < 7921821fc2b19c01588311f6e7468ae5b68b1f61; >= 7597385371425febdaa8c6a1da3625d4ffff16f5, < 5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989; >= 7597385371425febdaa8c6a1da3625d4ffff16f5, < 78b9589fda266c71f0f9d0c858d4fa7381a890a5; >= 7597385371425febdaa8c6a1da3625d4ffff16f5, < 43f8f7946814c8e5f464518246fdbc69b6e32326
LinuxLinux5.3

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74395?
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.
How severe is CVE-2026-74395?
Severity scoring for CVE-2026-74395 is pending analysis. The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74395?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST