{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "9e14606d8f38ea52a38c27692a9c1513c987a5da"
            },
            {
              "fixed": "b1faf348c29e6f8302ec7769cbf1c1ef05be014f"
            },
            {
              "fixed": "a11ebe8dc0333fb870bbbb656b34690e87ee3f98"
            },
            {
              "fixed": "d427b1c71d9798083e954d3c13469dc0a2305868"
            },
            {
              "fixed": "57938bbdb9bf7fd41cbd5cd509ec10c4b22bec18"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "f9965f7f38c90449a5fb26edb8a7d22b1dcf0283"
            },
            {
              "last_affected": "80fe27811c56ecd3896c3d511ab8298146071d98"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.4.16"
            },
            {
              "fixed": "6.5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.5.3"
            },
            {
              "fixed": "6.6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.6.0"
            },
            {
              "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"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98109.json"
  },
  "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(\u0026msft-\u003efilter_lock). If\nmsft_do_close() executes while hdev-\u003emsft_data is already assigned but the\nmutex has not yet been initialized, mutex_lock(\u0026msft-\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(\u0026hdev-\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(\u0026msft-\u003efilter_lock) has completed.",
  "id": "CVE-2026-98109",
  "modified": "2026-09-27T03:30:33.308654496Z",
  "published": "2026-09-25T10:35:57.537Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57938bbdb9bf7fd41cbd5cd509ec10c4b22bec18"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "Bluetooth: hci_core: Fix race condition during device registration"
}