RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference
Key facts
- Attack vector
- —
- Privileges required
- —
- User interaction
- —
- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
- —
- Fix status
- Partial Red Hat: 3 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2026-74395
- 2026-10-03 Alias added: GHSA-x75h-3pjw-vh4q
- 2026-11-06 CISA SSVC decision points changed
References
Other 8
- 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
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Sources
- CVE-2026-74395 · CVE Program
- CVE-2026-74395 · NVD
- FIRST EPSS
- GHSA-x75h-3pjw-vh4q · GitHub Advisory Database · CC BY 4.0
- CVE-2026-74395 · Red Hat security data · CC BY 4.0
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