Bluetooth: hci_core: Fix race condition during device registration

{
  "id": "b35020efea21f3acd7abe2c24ced5a66c252c2dc66c09af36317917afa47a0c6",
  "url": "https://osv.dev/vulnerability/CVE-2026-98109",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: hci_core: Fix race condition during device registration",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_core: Fix race condition during device registration In hci_register_dev(), the power_on work item is queued to hdev->req_workqueue before initializing hdev->adv_monitors_idr and registering the MSFT extension via msft_register(). For devices marked with quirks such as HCI_QUIRK_RAW_DEVICE, the HCI_UNCONFIGURED flag is set on the device. When the power_on work item runs concurrently on another CPU, hci_power_on() detects that the device is unconfigured and immediately invokes hci_dev_do_close(), which calls msft_do_close(). Concurrently, msft_register() allocates the msft structure and exposes it to hdev->msft_data prior to calling mutex_init(&msft->filter_lock). If msft_do_close() executes while hdev->msft_data is already assigned but the mutex has not yet been initialized, mutex_lock(&msft->filter_lock) operates on an uninitialized mutex, triggering a DEBUG_LOCKS warning: DEBUG_LOCKS_WARN_ON(lock->magic != lock) WARNING: kernel/locking/mutex.c:625 at __mutex_lock_common kernel/locking/mutex.c:625 [inline] WARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x12d8/0x1550 kernel/locking/mutex.c:821 ... Call Trace: msft_do_close+0x308/0x7b0 net/bluetooth/msft.c:693 hci_dev_close_sync+0x86b/0x10a0 net/bluetooth/hci_sync.c:5522 hci_dev_do_close net/bluetooth/hci_core.c:499 [inline] hci_power_on+0x32c/0x750 net/bluetooth/hci_core.c:937 process_one_work kernel/workqueue.c:3322 [inline] process_schedu",
    "evidence": "osv:CVE-2026-98109",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98109",
      "aliases": [
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      "modified": "2026-10-28T02:30:31.487951505Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/57938bbdb9bf7fd41cbd5cd509ec10c4b22bec18",
        "https://git.kernel.org/stable/c/593e64f64a20b25e4042c3ee863119eb7f991785",
        "https://git.kernel.org/stable/c/a11ebe8dc0333fb870bbbb656b34690e87ee3f98",
        "https://git.kernel.org/stable/c/b1faf348c29e6f8302ec7769cbf1c1ef05be014f",
        "https://git.kernel.org/stable/c/d427b1c71d9798083e954d3c13469dc0a2305868",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98109.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98109",
        "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/2026/98xxx/CVE-2026-98109.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98109",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 498649,
  "published_at": "2026-09-25T10:35:57.537+00:00"
}