FKIE_CVE-2025-71135

Vulnerability from fkie_nvd - Published: 2026-01-14 15:16 - Updated: 2026-01-14 16:25
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: md/raid5: fix possible null-pointer dereferences in raid5_store_group_thread_cnt() The variable mddev->private is first assigned to conf and then checked: conf = mddev->private; if (!conf) ... If conf is NULL, then mddev->private is also NULL. In this case, null-pointer dereferences can occur when calling raid5_quiesce(): raid5_quiesce(mddev, true); raid5_quiesce(mddev, false); since mddev->private is assigned to conf again in raid5_quiesce(), and conf is dereferenced in several places, for example: conf->quiesce = 0; wake_up(&conf->wait_for_quiescent); To fix this issue, the function should unlock mddev and return before invoking raid5_quiesce() when conf is NULL, following the existing pattern in raid5_change_consistency_policy().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/20597b7229aea8b5bc45cd92097640257c7fc33b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7ad6ef91d8745d04aff9cce7bdbc6320d8e05fe9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e5abb6af905de6b2fead8a0b3f32ab0b81468a01
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid5: fix possible null-pointer dereferences in raid5_store_group_thread_cnt()\n\nThe variable mddev-\u003eprivate is first assigned to conf and then checked:\n\n  conf = mddev-\u003eprivate;\n  if (!conf) ...\n\nIf conf is NULL, then mddev-\u003eprivate is also NULL. In this case,\nnull-pointer dereferences can occur when calling raid5_quiesce():\n\n  raid5_quiesce(mddev, true);\n  raid5_quiesce(mddev, false);\n\nsince mddev-\u003eprivate is assigned to conf again in raid5_quiesce(), and conf\nis dereferenced in several places, for example:\n\n  conf-\u003equiesce = 0;\n  wake_up(\u0026conf-\u003ewait_for_quiescent);\n\nTo fix this issue, the function should unlock mddev and return before\ninvoking raid5_quiesce() when conf is NULL, following the existing pattern\nin raid5_change_consistency_policy()."
    }
  ],
  "id": "CVE-2025-71135",
  "lastModified": "2026-01-14T16:25:12.057",
  "metrics": {},
  "published": "2026-01-14T15:16:03.277",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/20597b7229aea8b5bc45cd92097640257c7fc33b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7ad6ef91d8745d04aff9cce7bdbc6320d8e05fe9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e5abb6af905de6b2fead8a0b3f32ab0b81468a01"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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