Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()

{
  "id": "e1dafad954b23f3806bf17898eea6de1d8201772654bc123a3d08df7df910d5e",
  "url": "https://osv.dev/vulnerability/CVE-2023-54210",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_remove_adv_monitor() KASAN reports that there's a use-after-free in hci_remove_adv_monitor(). Trawling through the disassembly, you can see that the complaint is from the access in bt_dev_dbg() under the HCI_ADV_MONITOR_EXT_MSFT case. The problem case happens because msft_remove_monitor() can end up freeing the monitor structure. Specifically: hci_remove_adv_monitor() -> msft_remove_monitor() -> msft_remove_monitor_sync() -> msft_le_cancel_monitor_advertisement_cb() -> hci_free_adv_monitor() Let's fix the problem by just stashing the relevant data when it's still valid.",
    "evidence": "osv:CVE-2023-54210",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.42",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.4.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2023-54210",
      "aliases": [
        "CVE-2023-54210"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
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              "type": "GIT",
              "events": [
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                {
                  "fixed": "0d4d6b083da9b033ddccef72d77f373c819ae3ea"
                },
                {
                  "fixed": "bf00c2c8f6254f44ac041aa9a311ae9e0caf692b"
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                {
                  "fixed": "de6dfcefd107667ce2dbedf4d9337f5ed557a4a1"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54210.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.0.0"
                },
                {
                  "fixed": "6.1.42"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.4.7"
                }
              ]
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-54210.json"
          }
        }
      ],
      "modified": "2026-10-30T02:30:44.273694759Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0d4d6b083da9b033ddccef72d77f373c819ae3ea",
        "https://git.kernel.org/stable/c/bf00c2c8f6254f44ac041aa9a311ae9e0caf692b",
        "https://git.kernel.org/stable/c/de6dfcefd107667ce2dbedf4d9337f5ed557a4a1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54210.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-54210",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54210.json"
      }
    },
    "related_cves": [
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        "value": "CVE-2023-54210",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 505479,
  "published_at": "2025-12-30T12:11:08.682+00:00"
}