CVE-2026-74395 (GCVE-0-2026-74395)
Vulnerability from cvelistv5
Published
2026-08-15 05:59
Modified
2026-08-17 05:18
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7597385371425febdaa8c6a1da3625d4ffff16f5
Version: 7597385371425febdaa8c6a1da3625d4ffff16f5
Version: 7597385371425febdaa8c6a1da3625d4ffff16f5
Version: 7597385371425febdaa8c6a1da3625d4ffff16f5
Version: 7597385371425febdaa8c6a1da3625d4ffff16f5
Version: 7597385371425febdaa8c6a1da3625d4ffff16f5
Version: 7597385371425febdaa8c6a1da3625d4ffff16f5
Version: 7597385371425febdaa8c6a1da3625d4ffff16f5
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix devx subscribe-event unwind NULL dereference\n\nMLX5_IB_METHOD_DEVX_SUBSCRIBE_EVENT() links event_sub into sub_list\nbefore initializing the fields used by the shared error path.\n\nIf eventfd_ctx_fdget() then fails, the unwind path dereferences\nevent_sub-\u003eev_file in uverbs_uobject_put() and calls\nsubscribe_event_xa_dealloc() with an unset xa_key_level1.\n\nsubscribe_event_xa_alloc() creates the XA entry exactly once for a given\nkey_level1, on the first occurrence of that key. 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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:18:34.634Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/6e15b770461eeaa0ff73934922cb670a6a9db04e"
        },
        {
          "url": "https://git.kernel.org/stable/c/9be9aca28424228586fe9211c373ebdb826ebb6c"
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        {
          "url": "https://git.kernel.org/stable/c/f345e744b6b087188cde2377da5cbe9713b61353"
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        {
          "url": "https://git.kernel.org/stable/c/1025dc2f7ba29b04b8687790fa91f9cd1a53141e"
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          "url": "https://git.kernel.org/stable/c/7921821fc2b19c01588311f6e7468ae5b68b1f61"
        },
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          "url": "https://git.kernel.org/stable/c/5100febf8e9d6c8c5ba8dc6534c6a5e3376e5989"
        },
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          "url": "https://git.kernel.org/stable/c/78b9589fda266c71f0f9d0c858d4fa7381a890a5"
        },
        {
          "url": "https://git.kernel.org/stable/c/43f8f7946814c8e5f464518246fdbc69b6e32326"
        }
      ],
      "title": "RDMA/mlx5: Fix devx subscribe-event unwind NULL dereference",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74395",
    "datePublished": "2026-08-15T05:59:07.798Z",
    "dateReserved": "2026-08-15T05:44:03.891Z",
    "dateUpdated": "2026-08-17T05:18:34.634Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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