{"id":"CVE-2026-98109","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-\u003ereq_workqueue before initializing hdev-\u003eadv_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-\u003emsft_data prior to calling mutex_init(&msft-\u003efilter_lock). If\nmsft_do_close() executes while hdev-\u003emsft_data is already assigned but the\nmutex has not yet been initialized, mutex_lock(&msft-\u003efilter_lock) operates\non an uninitialized mutex, triggering a DEBUG_LOCKS warning:\n\nDEBUG_LOCKS_WARN_ON(lock-\u003emagic != 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 \u003cTASK\u003e\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 \u003c/TASK\u003e\n\nFix this by moving the queue_work() call in hci_register_dev() to after\nidr_init(&hdev-\u003eadv_monitors_idr) and msft_register(hdev) so that device\nstructures and extensions are fully initialized before asynchronous tasks\ncan access them. Additionally, assign hdev-\u003emsft_data in msft_register()\nonly after mutex_init(&msft-\u003efilter_lock) has completed.","modified":"2026-11-13T04:07:30.256595653Z","published":"2026-09-25T10:35:57.537Z","related":["SUSE-SU-2026:24643-1","SUSE-SU-2026:24648-1","SUSE-SU-2026:24651-1","SUSE-SU-2026:24662-1","SUSE-SU-2026:5091-1","openSUSE-SU-2026:12074-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98109.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/57938bbdb9bf7fd41cbd5cd509ec10c4b22bec18"},{"type":"WEB","url":"https://git.kernel.org/stable/c/593e64f64a20b25e4042c3ee863119eb7f991785"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a11ebe8dc0333fb870bbbb656b34690e87ee3f98"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b1faf348c29e6f8302ec7769cbf1c1ef05be014f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d427b1c71d9798083e954d3c13469dc0a2305868"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98109.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98109"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"9e14606d8f38ea52a38c27692a9c1513c987a5da"},{"fixed":"593e64f64a20b25e4042c3ee863119eb7f991785"},{"fixed":"b1faf348c29e6f8302ec7769cbf1c1ef05be014f"},{"fixed":"a11ebe8dc0333fb870bbbb656b34690e87ee3f98"},{"fixed":"d427b1c71d9798083e954d3c13469dc0a2305868"},{"fixed":"57938bbdb9bf7fd41cbd5cd509ec10c4b22bec18"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"f9965f7f38c90449a5fb26edb8a7d22b1dcf0283"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"80fe27811c56ecd3896c3d511ab8298146071d98"}]}],"versions":["v6.4.16","v6.5.13","v6.5.12","v6.5.11","v6.5.10","v6.5.9","v6.5.8","v6.5.7","v6.5.6","v6.5.5","v6.5.4","v6.5.3"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98109.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.4.16"},{"fixed":"6.5"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.5.3"},{"fixed":"6.6"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.6.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.111"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.53"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.7"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-98109.json"}}],"schema_version":"1.9.2"}