{
  "schema_version": "1.4.0",
  "id": "GHSA-3w47-qc84-prwf",
  "modified": "2025-09-18T18:30:28Z",
  "published": "2025-09-18T18:30:28Z",
  "aliases": [
    "CVE-2023-53445"
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: qrtr: Fix a refcount bug in qrtr_recvmsg()\n\nSyzbot reported a bug as following:\n\nrefcount_t: addition on 0; use-after-free.\n...\nRIP: 0010:refcount_warn_saturate+0x17c/0x1f0 lib/refcount.c:25\n...\nCall Trace:\n <TASK>\n __refcount_add include/linux/refcount.h:199 [inline]\n __refcount_inc include/linux/refcount.h:250 [inline]\n refcount_inc include/linux/refcount.h:267 [inline]\n kref_get include/linux/kref.h:45 [inline]\n qrtr_node_acquire net/qrtr/af_qrtr.c:202 [inline]\n qrtr_node_lookup net/qrtr/af_qrtr.c:398 [inline]\n qrtr_send_resume_tx net/qrtr/af_qrtr.c:1003 [inline]\n qrtr_recvmsg+0x85f/0x990 net/qrtr/af_qrtr.c:1070\n sock_recvmsg_nosec net/socket.c:1017 [inline]\n sock_recvmsg+0xe2/0x160 net/socket.c:1038\n qrtr_ns_worker+0x170/0x1700 net/qrtr/ns.c:688\n process_one_work+0x991/0x15c0 kernel/workqueue.c:2390\n worker_thread+0x669/0x1090 kernel/workqueue.c:2537\n\nIt occurs in the concurrent scenario of qrtr_recvmsg() and\nqrtr_endpoint_unregister() as following:\n\n\tcpu0\t\t\t\t\tcpu1\nqrtr_recvmsg\t\t\t\tqrtr_endpoint_unregister\nqrtr_send_resume_tx\t\t\tqrtr_node_release\nqrtr_node_lookup\t\t\tmutex_lock(&qrtr_node_lock)\nspin_lock_irqsave(&qrtr_nodes_lock, )\trefcount_dec_and_test(&node->ref) [node->ref == 0]\nradix_tree_lookup [node != NULL]\t__qrtr_node_release\nqrtr_node_acquire\t\t\tspin_lock_irqsave(&qrtr_nodes_lock, )\nkref_get(&node->ref) [WARNING]\t\t...\n\t\t\t\t\tmutex_unlock(&qrtr_node_lock)\n\nUse qrtr_node_lock to protect qrtr_node_lookup() implementation, this\nis actually improving the protection of node reference.",
  "severity": [],
  "affected": [],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53445"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44d807320000db0d0013372ad39b53e12d52f758"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/48a07f6e00d305597396da4d7494b81cec05b9d3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98a9cd82c541ef6cbdb829cd6c05cbbb471e373c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aa95efa187b4114075f312b3c4680d050b56fdec"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b9ba5906c42089f8e1d0001b7b50a7940f086cbb"
    }
  ],
  "database_specific": {
    "cwe_ids": [],
    "severity": null,
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-09-18T16:15:48Z"
  }
}