---
id: CVE-2025-40318
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once

  hci_cmd_sync_dequeue_once() does lookup and then cancel
  the entry under two separate lock sections
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once

  hci_cmd_sync_dequeue_once() does lookup and then cancel
  the entry under two separate lock sections. Meanwhil…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
published: '2025-12-08'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T22:10:00.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-40318'
references:
  - url: 'https://git.kernel.org/stable/c/09b0cd1297b4dbfe736aeaa0ceeab2265f47f772'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0a94f7e017438935c09ef833a1aa908ad9875213'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/932c0a4f77ac13e526fdd5b42914d29c9821d389'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9cd536970192b72257afcdfba0bfc09993e6f19c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ae76cf6c2c842944c6514c57df54d728f1916553'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.0027
epssPercentile: 0.17915
ingestedAt: '2026-10-14T23:00:02.023Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sync: fix race in hci_cmd_sync_dequeue_once

hci_cmd_sync_dequeue_once() does lookup and then cancel
the entry under two separate lock sections. Meanwhile,
hci_cmd_sync_work() can also delete the same entry,
leading to double list_del() and "UAF".

Fix this by holding cmd_sync_work_lock across both
lookup and cancel, so that the entry cannot be removed
concurrently.

## Remediation

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