CVE-2026-80762

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    CVE-2026-80762

    Published: 4 Sept 2026Last Modified: 15 Sept 2026

    Summary: Bluetooth: hci_sync: Fix accept list UAF during suspend

    Details: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix accept list UAF during suspend hci_update_event_filter_sync() walks hdev->accept_list while sending a synchronous HCI command for each remote-wakeup device. The suspend path holds hdev->req_lock, but accept-list updates are serialized by hdev->lock. Consequently, remove_device() can free the current list entry during the controller wait. The following interleaving causes the use-after-free: hci_update_event_filter_sync() remove_device() fetch accept-list entry hci_set_event_filter_sync() wait for controller response hci_dev_lock() list_del() kfree() hci_dev_unlock() read the freed list.next KASAN reported: BUG: KASAN: slab-use-after-free in hci_suspend_sync+0x835/0x910 Read of size 8 at addr ffff88810bec8440 by task kworker/0:1/10 Workqueue: events vhci_suspend_work Call Trace: hci_suspend_sync+0x835/0x910 hci_suspend_dev+0x182/0x450 process_one_work+0x661/0x1090 worker_thread+0x45b/0xd10 Allocated by task 86: hci_bdaddr_list_add_with_flags+0x1a8/0x400 add_device+0x381/0x820 hci_sock_sendmsg+0x1033/0x1ea0 Freed by task 91: kfree+0x131/0x3c0 remove_device+0x429/0xb70 hci_sock_sendmsg+0x1033/0x1ea0 Snapshot the remote-wakeup addresses under hdev->lock. Release the lock before sending HCI commands. Clear the controller event filter before building the snapshot, and skip allocation and the second list traversal when there are no matching entries. This preserves the original filter and scan-state updates without retaining an accept-list node across a controller wait.

    References: https://git.kernel.org/stable/c/29c59212a507804d7616b8abf491d30b4ab8e75f, https://git.kernel.org/stable/c/87ad116ac3abc6f2ce2b5b6c488f633003581eee, https://git.kernel.org/stable/c/95bb57bc11a91caf042ad00fca85e480d3fda37f, https://git.kernel.org/stable/c/b5181516a9f5c2fdb3271cdad72a5b16c6963a44, https://git.kernel.org/stable/c/bb5f5414d1a6272a16f68684e998f4063dd19f57, https://git.kernel.org/stable/c/f57b399c4fa1501b2d5451f52d861ece86bcf3db, https://git.kernel.org/stable/c/fe93a697a7a92fa9adf78c9ff67a10db3193290c, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80762.json, https://nvd.nist.gov/vuln/detail/CVE-2026-80762, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 182ee45da083db4e3e621541ccf255bfa9652214
    Fixed -bb5f5414d1a6272a16f68684e998f4063dd19f57

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2026-80762 | CVE-DB