---
id: CVE-2023-54214
title: 'Bluetooth: L2CAP: Fix potential user-after-free'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: L2CAP: Fix potential user-after-free

  This fixes all instances of which requires to allocate a buffer calling
  alloc_skb which may release the chan lock and r…
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'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <
    b2fde8cb2a25125111f2144604e0e7c0ebcc4bba
  - >-
    Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <
    a6a7d1541fefddf7ca0cfb34c1bff63ff809cc49
  - >-
    Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <
    60aaccf16d1e099c16bebfb96428ae762cb528f7
  - >-
    Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <
    b8ed41cc04fb74005aa51d17865ca3d022760335
  - >-
    Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <
    31a288a4df7f6a28e65da22a4ab2add4a963738e
  - >-
    Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <
    64e28ecf44e46de9f01915a4146706a21c3469d2
  - >-
    Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <
    994e3e18908f5c4a12d07b44018e6aa85f071048
  - >-
    Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <
    df5703348813235874d851934e957c3723d71644
  - Linux 3.5
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:39:26.318408Z'
published: '2025-12-30'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T21:41:41.834Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-54214'
references:
  - url: 'https://git.kernel.org/stable/c/b2fde8cb2a25125111f2144604e0e7c0ebcc4bba'
  - url: 'https://git.kernel.org/stable/c/a6a7d1541fefddf7ca0cfb34c1bff63ff809cc49'
  - url: 'https://git.kernel.org/stable/c/60aaccf16d1e099c16bebfb96428ae762cb528f7'
  - url: 'https://git.kernel.org/stable/c/b8ed41cc04fb74005aa51d17865ca3d022760335'
  - url: 'https://git.kernel.org/stable/c/31a288a4df7f6a28e65da22a4ab2add4a963738e'
  - url: 'https://git.kernel.org/stable/c/64e28ecf44e46de9f01915a4146706a21c3469d2'
  - url: 'https://git.kernel.org/stable/c/994e3e18908f5c4a12d07b44018e6aa85f071048'
  - url: 'https://git.kernel.org/stable/c/df5703348813235874d851934e957c3723d71644'
tags:
  - cve.org
epss: 0.003
epssPercentile: 0.21141
ingestedAt: '2026-10-15T22:48:25.433Z'
---

## Overview

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

Bluetooth: L2CAP: Fix potential user-after-free

This fixes all instances of which requires to allocate a buffer calling
alloc_skb which may release the chan lock and reacquire later which
makes it possible that the chan is disconnected in the meantime.

## Affected

- `Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 < b2fde8cb2a25125111f2144604e0e7c0ebcc4bba`
- `Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 < a6a7d1541fefddf7ca0cfb34c1bff63ff809cc49`
- `Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 < 60aaccf16d1e099c16bebfb96428ae762cb528f7`
- `Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 < b8ed41cc04fb74005aa51d17865ca3d022760335`
- `Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 < 31a288a4df7f6a28e65da22a4ab2add4a963738e`
- `Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 < 64e28ecf44e46de9f01915a4146706a21c3469d2`
- `Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 < 994e3e18908f5c4a12d07b44018e6aa85f071048`
- `Linux >= a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 < df5703348813235874d851934e957c3723d71644`
- `Linux 3.5`

## Remediation

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