{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2023-53445",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53445",
    "idYear": 2023,
    "status": "PUBLISHED",
    "publishedAt": "2025-09-18T16:04:21.257Z",
    "updatedAt": "2026-08-05T09:14:09.277Z",
    "importedAt": "2026-10-24T01:57:03.413Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "net: qrtr: Fix a refcount bug in qrtr_recvmsg()",
      "summary": "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.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0a7e0d0ef05440db03c3199e84d228db943b237f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "98a9cd82c541ef6cbdb829cd6c05cbbb471e373c"
            },
            {
              "version": "0a7e0d0ef05440db03c3199e84d228db943b237f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b9ba5906c42089f8e1d0001b7b50a7940f086cbb"
            },
            {
              "version": "0a7e0d0ef05440db03c3199e84d228db943b237f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "aa95efa187b4114075f312b3c4680d050b56fdec"
            },
            {
              "version": "0a7e0d0ef05440db03c3199e84d228db943b237f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "48a07f6e00d305597396da4d7494b81cec05b9d3"
            },
            {
              "version": "0a7e0d0ef05440db03c3199e84d228db943b237f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "44d807320000db0d0013372ad39b53e12d52f758"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.6",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.6"
            },
            {
              "version": "5.10.178",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.107",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.24",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.2.11",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.2.*"
            },
            {
              "version": "6.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}