{
  "cveId": "CVE-2026-93261",
  "url": "https://patchblox.com/security/cve/CVE-2026-93261",
  "summary": "CVE-2026-93261 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-93261, released September 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "locking/lockdep: Fix NULL pointer dereference in __lock_set_class()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  locking/lockdep: Fix NULL pointer dereference in __lock_set_class()  register_lock_class() can return NULL when the lock class pool is exhausted, graph_lock() fails, or key validation fails. However, __lock_set_class() uses the return value directly in pointer arithmetic without a NULL check:    class = register_lock_class(lock, subclass, 0);   hlock-\u003Eclass_idx = class - lock_classes;  If class is NULL, this computes a wild offset that corrupts hlock-\u003Eclass_idx. The subsequent reacquire_held_locks() call will invoke hlock_class() with this corrupted index, leading to a NULL or out-of-bounds pointer dereference.  Add the missing NULL check, consistent with how __lock_acquire() already handles this case at the same call site.",
  "published": "2026-09-24T16:17:22Z",
  "severity": "Moderate",
  "cvss": 4.7,
  "epss": 0.00196,
  "epssPercentile": 0.0938,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93261",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.190-1",
      "fix": "DEBIAN-CVE-2026-93261",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93261",
      "released": "2026-09-24T19:30:44Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.111-1",
      "fix": "DEBIAN-CVE-2026-93261",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93261",
      "released": "2026-09-24T19:30:44Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-93261",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93261",
      "released": "2026-09-24T19:30:44Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.111-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-93261",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93261",
      "released": "2026-09-24T19:30:44Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}