{
  "cveId": "CVE-2023-53445",
  "url": "https://patchblox.com/security/cve/CVE-2023-53445",
  "summary": "CVE-2023-53445 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-53445, released September 18, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net: qrtr: Fix a refcount bug in qrtr_recvmsg()...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net: qrtr: Fix a refcount bug in qrtr_recvmsg()  Syzbot reported a bug as following:  refcount_t: addition on 0; use-after-free. ... RIP: 0010:refcount_warn_saturate\u002B0x17c/0x1f0 lib/refcount.c:25 ... Call Trace:  \u003CTASK\u003E  __refcount_add include/linux/refcount.h:199 [inline]  __refcount_inc include/linux/refcount.h:250 [inline]  refcount_inc include/linux/refcount.h:267 [inline]  kref_get include/linux/kref.h:45 [inline]  qrtr_node_acquire net/qrtr/af_qrtr.c:202 [inline]  qrtr_node_lookup net/qrtr/af_qrtr.c:398 [inline]  qrtr_send_resume_tx net/qrtr/af_qrtr.c:1003 [inline]  qrtr_recvmsg\u002B0x85f/0x990 net/qrtr/af_qrtr.c:1070  sock_recvmsg_nosec net/socket.c:1017 [inline]  sock_recvmsg\u002B0xe2/0x160 net/socket.c:1038  qrtr_ns_worker\u002B0x170/0x1700 net/qrtr/ns.c:688  process_one_work\u002B0x991/0x15c0 kernel/workqueue.c:2390  worker_thread\u002B0x669/0x1090 kernel/workqueue.c:2537  It occurs in the concurrent scenario of qrtr_recvmsg() and qrtr_endpoint_unregister() as following:  \tcpu0\t\t\t\t\tcpu1 qrtr_recvmsg\t\t\t\tqrtr_endpoint_unregister qrtr_send_resume_tx\t\t\tqrtr_node_release qrtr_node_lookup\t\t\tmutex_lock(\u0026qrtr_node_lock) spin_lock_irqsave(\u0026qrtr_nodes_lock, )\trefcount_dec_and_test(\u0026node-\u003Eref) [node-\u003Eref == 0] radix_tree_lookup [node != NULL]\t__qrtr_node_release qrtr_node_acquire\t\t\tspin_lock_irqsave(\u0026qrtr_nodes_lock, ) kref_get(\u0026node-\u003Eref) [WARNING]\t\t... \t\t\t\t\tmutex_unlock(\u0026qrtr_node_lock)  Use qrtr_node_lock to protect qrtr_node_lookup() implementation, this is actually improving the protection of node reference.",
  "published": "2025-09-18T16:15:48Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00152,
  "epssPercentile": 0.04346,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.25-1",
      "fix": "DEBIAN-CVE-2023-53445",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53445",
      "released": "2025-09-18T16:15:48Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.1.25-1",
      "fix": "DEBIAN-CVE-2023-53445",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53445",
      "released": "2025-09-18T16:15:48Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.1.25-1",
      "fix": "DEBIAN-CVE-2023-53445",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2023-53445",
      "released": "2025-09-18T16:15:48Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}