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CVE-2026-74395 (GCVE-0-2026-74395)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:18
VLAI
Title
RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 6e15b770461eeaa0ff73934922cb670a6a9db04e (git)
Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 9be9aca28424228586fe9211c373ebdb826ebb6c (git)
Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < f345e744b6b087188cde2377da5cbe9713b61353 (git)
Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 1025dc2f7ba29b04b8687790fa91f9cd1a53141e (git)
Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 7921821fc2b19c01588311f6e7468ae5b68b1f61 (git)
Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989 (git)
Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 78b9589fda266c71f0f9d0c858d4fa7381a890a5 (git)
Affected: 7597385371425febdaa8c6a1da3625d4ffff16f5 , < 43f8f7946814c8e5f464518246fdbc69b6e32326 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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The unwind path must\\ntherefore call subscribe_event_xa_dealloc() exactly once for it as well.\\n\\nEnforce that by adding devx_key_in_sub_list() and calling\\nsubscribe_event_xa_dealloc() only when the last matching pending entry is\\nbeing cleaned up.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/infiniband/hw/mlx5/devx.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7597385371425febdaa8c6a1da3625d4ffff16f5\",\"lessThan\":\"6e15b770461eeaa0ff73934922cb670a6a9db04e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7597385371425febdaa8c6a1da3625d4ffff16f5\",\"lessThan\":\"9be9aca28424228586fe9211c373ebdb826ebb6c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7597385371425febdaa8c6a1da3625d4ffff16f5\",\"lessThan\":\"f345e744b6b087188cde2377da5cbe9713b61353\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7597385371425febdaa8c6a1da3625d4ffff16f5\",\"lessThan\":\"1025dc2f7ba29b04b8687790fa91f9cd1a53141e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7597385371425febdaa8c6a1da3625d4ffff16f5\",\"lessThan\":\"7921821fc2b19c01588311f6e7468ae5b68b1f61\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7597385371425febdaa8c6a1da3625d4ffff16f5\",\"lessThan\":\"5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7597385371425febdaa8c6a1da3625d4ffff16f5\",\"lessThan\":\"78b9589fda266c71f0f9d0c858d4fa7381a890a5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7597385371425febdaa8c6a1da3625d4ffff16f5\",\"lessThan\":\"43f8f7946814c8e5f464518246fdbc69b6e32326\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/infiniband/hw/mlx5/devx.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1025dc2f7ba29b04b8687790fa91f9cd1a53141e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/43f8f7946814c8e5f464518246fdbc69b6e32326\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e15b770461eeaa0ff73934922cb670a6a9db04e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/78b9589fda266c71f0f9d0c858d4fa7381a890a5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7921821fc2b19c01588311f6e7468ae5b68b1f61\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9be9aca28424228586fe9211c373ebdb826ebb6c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f345e744b6b087188cde2377da5cbe9713b61353\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T22:19:04+00:00",
      "cve": "CVE-2026-74395",
      "id": "CVE-2026-74395",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74395.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.