CVE-2026-80764

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    CVE-2026-80764

    Published: 4 Sept 2026Last Modified: 15 Sept 2026

    Summary: Bluetooth: hci_event: fix LE list UAF on reset

    Details: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: fix LE list UAF on reset hci_cc_reset() clears the LE accept and resolving lists without taking hdev->lock. Other command-complete handlers serialize updates to these lists with that lock, and the debugfs readers hold it while walking them. This permits the reset completion and a debugfs read to interleave as follows: hci_rx_work debugfs reader ----------- -------------- lock hdev->lock fetch current entry list_del(entry) kfree(entry) read entry fields The reader then dereferences a freed list entry and may follow its stale next pointer. KASAN reported: BUG: KASAN: slab-use-after-free in white_list_show+0x15f/0x180 Read of size 1 at addr ffff8881015dab16 by task poc/95 Call Trace: white_list_show+0x15f/0x180 seq_read_iter+0x3ff/0x1190 seq_read+0x267/0x3d0 vfs_read+0x177/0xa20 ksys_read+0xf7/0x1c0 Allocated by task 91: hci_bdaddr_list_add+0x1a6/0x3a0 hci_cc_le_add_to_accept_list+0xab/0x140 hci_cmd_complete_evt+0x26c/0x9a0 hci_event_packet+0x454/0xb20 hci_rx_work+0x293/0x730 Freed by task 90: kfree+0x131/0x3c0 hci_bdaddr_list_clear+0xd8/0x160 hci_cc_reset+0x28a/0x370 hci_cmd_complete_evt+0x26c/0x9a0 hci_event_packet+0x454/0xb20 hci_rx_work+0x293/0x730 Take hdev->lock around both list clears. This matches the existing mutation and traversal locking convention.

    References: https://git.kernel.org/stable/c/0628cc9b2fa29985a7b8c774741f8a736b0f5e7c, https://git.kernel.org/stable/c/25b05e3ce31d954540e99954bcc66cbceb27ab35, https://git.kernel.org/stable/c/33af47e847fe4a28b109673affb5874015d54f5a, https://git.kernel.org/stable/c/39a3afb91be3cb465f46ce7a8e5696d9e33edf93, https://git.kernel.org/stable/c/8e68c380290b1dd64a0a512ce66d0264130c46ed, https://git.kernel.org/stable/c/b55e83a4ba31d40deae22d4e4dc8c84083e953c6, https://git.kernel.org/stable/c/d57702d4c55633c243da5a2fec37ae2ad4adb621, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80764.json, https://nvd.nist.gov/vuln/detail/CVE-2026-80764, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- a4d5504d5c39cc84f1f828e19967595597a8136e
    Fixed -8e68c380290b1dd64a0a512ce66d0264130c46ed

    Affected versions

    v3.18-rc1

    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-2026-80764 | CVE-DB