{"schema":"threatline.record/2","record":{"id":"CVE-2026-98109","aliases":[],"summary":"Bluetooth: hci_core: Fix race condition during device registration","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: hci_core: Fix race condition during device registration\n\nIn hci_register_dev(), the power_on work item is queued to\nhdev->req_workqueue before initializing hdev->adv_monitors_idr and\nregistering the MSFT extension via msft_register(). For devices marked with\nquirks such as HCI_QUIRK_RAW_DEVICE, the HCI_UNCONFIGURED flag is set on\nthe device. When the power_on work item runs concurrently on another CPU,\nhci_power_on() detects that the device is unconfigured and immediately\ninvokes hci_dev_do_close(), which calls msft_do_close().\n\nConcurrently, msft_register() allocates the msft structure and exposes it\nto hdev->msft_data prior to calling mutex_init(&msft->filter_lock). If\nmsft_do_close() executes while hdev->msft_data is already assigned but the\nmutex has not yet been initialized, mutex_lock(&msft->filter_lock) operates\non an uninitialized mutex, triggering a DEBUG_LOCKS warning:\n\nDEBUG_LOCKS_WARN_ON(lock->magic != lock)\nWARNING: kernel/locking/mutex.c:625 at __mutex_lock_common\nkernel/locking/mutex.c:625 [inline]\nWARNING: kernel/locking/mutex.c:625 at __mutex_lock+0x12d8/0x1550\nkernel/locking/mutex.c:821\n...\nCall Trace:\n <TASK>\n msft_do_close+0x308/0x7b0 net/bluetooth/msft.c:693\n hci_dev_close_sync+0x86b/0x10a0 net/bluetooth/hci_sync.c:5522\n hci_dev_do_close net/bluetooth/hci_core.c:499 [inline]\n hci_power_on+0x32c/0x750 net/bluetooth/hci_core.c:937\n process_one_work kernel/workqueue.c:3322 [inline]\n process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405\n worker_thread+0x92d/0xe10 kernel/workqueue.c:3486\n kthread+0x388/0x470 kernel/kthread.c:436\n ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245\n </TASK>\n\nFix this by moving the queue_work() call in hci_register_dev() to after\nidr_init(&hdev->adv_monitors_idr) and msft_register(hdev) so that device\nstructures and extensions are fully initialized before asynchronous tasks\ncan access them. Additionally, assign hdev->msft_data in msft_register()\nonly after mutex_init(&msft->filter_lock) has completed.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98109","source_modified_at":"2026-10-19T09:14:01.739Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"9e14606d8f38ea52a38c27692a9c1513c987a5da","lessThan":"593e64f64a20b25e4042c3ee863119eb7f991785","status":"affected","versionType":"git"},{"version":"9e14606d8f38ea52a38c27692a9c1513c987a5da","lessThan":"b1faf348c29e6f8302ec7769cbf1c1ef05be014f","status":"affected","versionType":"git"},{"version":"9e14606d8f38ea52a38c27692a9c1513c987a5da","lessThan":"a11ebe8dc0333fb870bbbb656b34690e87ee3f98","status":"affected","versionType":"git"},{"version":"9e14606d8f38ea52a38c27692a9c1513c987a5da","lessThan":"d427b1c71d9798083e954d3c13469dc0a2305868","status":"affected","versionType":"git"},{"version":"9e14606d8f38ea52a38c27692a9c1513c987a5da","lessThan":"57938bbdb9bf7fd41cbd5cd509ec10c4b22bec18","status":"affected","versionType":"git"},{"version":"f9965f7f38c90449a5fb26edb8a7d22b1dcf0283","status":"affected","versionType":"git"},{"version":"80fe27811c56ecd3896c3d511ab8298146071d98","status":"affected","versionType":"git"},{"version":"6.4.16","lessThan":"6.5","status":"affected","versionType":"semver"},{"version":"6.5.3","lessThan":"6.6","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98109","source_modified_at":"2026-10-19T09:14:01.739Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.6","status":"affected"},{"version":"0","lessThan":"6.6","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98109","source_modified_at":"2026-10-19T09:14:01.739Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"593e64f64a20b25e4042c3ee863119eb7f991785","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98109","source_modified_at":"2026-10-19T09:14:01.739Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"57938bbdb9bf7fd41cbd5cd509ec10c4b22bec18","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98109","source_modified_at":"2026-10-19T09:14:01.739Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.5","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98109","source_modified_at":"2026-10-19T09:14:01.739Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.6","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00089,"percentile":0.00377,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:35:57.537Z","modified_at":"2026-10-19T09:14:01.739Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98109","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:14:01.739Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98109","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/593e64f64a20b25e4042c3ee863119eb7f991785"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/b1faf348c29e6f8302ec7769cbf1c1ef05be014f"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a11ebe8dc0333fb870bbbb656b34690e87ee3f98"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/d427b1c71d9798083e954d3c13469dc0a2305868"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/57938bbdb9bf7fd41cbd5cd509ec10c4b22bec18"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:14:01.739Z","content_hash":"a855aa0b258516f4d9c2bde421c6ad0920fdfaec2930a253c879b7a79bddc418"}}