---
id: CVE-2026-80764
title: 'Bluetooth: hci_event: fix LE list UAF on reset'
summary: |-
  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 seria…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e <
    8e68c380290b1dd64a0a512ce66d0264130c46ed
  - >-
    Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e <
    0628cc9b2fa29985a7b8c774741f8a736b0f5e7c
  - >-
    Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e <
    d57702d4c55633c243da5a2fec37ae2ad4adb621
  - >-
    Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e <
    39a3afb91be3cb465f46ce7a8e5696d9e33edf93
  - >-
    Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e <
    b55e83a4ba31d40deae22d4e4dc8c84083e953c6
  - >-
    Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e <
    25b05e3ce31d954540e99954bcc66cbceb27ab35
  - >-
    Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e <
    33af47e847fe4a28b109673affb5874015d54f5a
  - Linux 0de8cd646b0152c9ddd10257d8284938d0df0181
  - Linux >= 3.18.3 < 3.19
  - Linux 3.19
published: '2026-09-04'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:43:20.790Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80764'
references:
  - url: 'https://git.kernel.org/stable/c/8e68c380290b1dd64a0a512ce66d0264130c46ed'
  - url: 'https://git.kernel.org/stable/c/0628cc9b2fa29985a7b8c774741f8a736b0f5e7c'
  - url: 'https://git.kernel.org/stable/c/d57702d4c55633c243da5a2fec37ae2ad4adb621'
  - url: 'https://git.kernel.org/stable/c/39a3afb91be3cb465f46ce7a8e5696d9e33edf93'
  - url: 'https://git.kernel.org/stable/c/b55e83a4ba31d40deae22d4e4dc8c84083e953c6'
  - url: 'https://git.kernel.org/stable/c/25b05e3ce31d954540e99954bcc66cbceb27ab35'
  - url: 'https://git.kernel.org/stable/c/33af47e847fe4a28b109673affb5874015d54f5a'
tags:
  - cve.org
epss: 0.00173
epssPercentile: 0.06219
ingestedAt: '2026-10-19T10:20:54.952Z'
---

## Overview

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.

## Affected

- `Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e < 8e68c380290b1dd64a0a512ce66d0264130c46ed`
- `Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e < 0628cc9b2fa29985a7b8c774741f8a736b0f5e7c`
- `Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e < d57702d4c55633c243da5a2fec37ae2ad4adb621`
- `Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e < 39a3afb91be3cb465f46ce7a8e5696d9e33edf93`
- `Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e < b55e83a4ba31d40deae22d4e4dc8c84083e953c6`
- `Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e < 25b05e3ce31d954540e99954bcc66cbceb27ab35`
- `Linux >= a4d5504d5c39cc84f1f828e19967595597a8136e < 33af47e847fe4a28b109673affb5874015d54f5a`
- `Linux 0de8cd646b0152c9ddd10257d8284938d0df0181`
- `Linux >= 3.18.3 < 3.19`
- `Linux 3.19`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.