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Bluetooth: hci_core: Fix race condition during device registration

Type: advisorySource: Official CVE List1 source record

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

Announced Source revision 1
Original source ↗

CVE-2026-98109

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98109

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "9e14606d8f38ea52a38c27692a9c1513c987a5da",
        "lessThan": "593e64f64a20b25e4042c3ee863119eb7f991785",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9e14606d8f38ea52a38c27692a9c1513c987a5da",
        "lessThan": "b1faf348c29e6f8302ec7769cbf1c1ef05be014f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9e14606d8f38ea52a38c27692a9c1513c987a5da",
        "lessThan": "a11ebe8dc0333fb870bbbb656b34690e87ee3f98",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9e14606d8f38ea52a38c27692a9c1513c987a5da",
        "lessThan": "d427b1c71d9798083e954d3c13469dc0a2305868",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9e14606d8f38ea52a38c27692a9c1513c987a5da",
        "lessThan": "57938bbdb9bf7fd41cbd5cd509ec10c4b22bec18",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "f9965f7f38c90449a5fb26edb8a7d22b1dcf0283",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "80fe27811c56ecd3896c3d511ab8298146071d98",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.4.16",
        "lessThan": "6.5",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.5.3",
        "lessThan": "6.6",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "net/bluetooth/hci_core.c",
      "net/bluetooth/msft.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.6"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.6",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bluetooth/hci_core.c",
      "net/bluetooth/msft.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98109

Source reference: /cveMetadata/cveId

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Event
#38209 · Revision 1
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