CVE-2023-54214

Kernel crash or corruption via L2CAP race

Published Dec 30, 2025 · Updated Dec 30, 2025

Use-after-free in Bluetooth L2CAP in affected Linux kernel branches allows physically proximate attackers to crash or corrupt the kernel. Buffer allocation through alloc_skb can drop and later reacquire the channel lock, allowing a concurrent disconnection to free the L2CAP connection before the caller resumes using it. Exploitation requires Bluetooth radio proximity and winning the disconnect race; successful access is bounded to kernel memory disclosure, modification, or service interruption.

CVSS severity8.8
High
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Bluetooth L2CAP in affected Linux kernel branches allows physically proximate attackers to crash or corrupt the kernel. Buffer allocation through alloc_skb can drop and later reacquire the channel lock, allowing a concurrent disconnection to free the L2CAP connection before the caller resumes using it. Exploitation requires Bluetooth radio proximity and winning the disconnect race; successful access is bounded to kernel memory disclosure, modification, or service interruption.

The record

CVE
CVE-2023-54214
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.5
  2. Affected versionversion=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <31a288a4df7f6a28e65da22a4ab2add4a963738e
  3. Affected versionversion=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <60aaccf16d1e099c16bebfb96428ae762cb528f7
  4. Affected versionversion=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <64e28ecf44e46de9f01915a4146706a21c3469d2
  5. Affected versionversion=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <994e3e18908f5c4a12d07b44018e6aa85f071048
  6. Affected versionversion=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <a6a7d1541fefddf7ca0cfb34c1bff63ff809cc49
  7. Affected versionversion=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <b2fde8cb2a25125111f2144604e0e7c0ebcc4bba
  8. Affected versionversion=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <b8ed41cc04fb74005aa51d17865ca3d022760335
  9. Affected versionversion=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <df5703348813235874d851934e957c3723d71644

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.5; version=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <31a288a4df7f6a28e65da22a4ab2add4a963738e; version=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <60aaccf16d1e099c16bebfb96428ae762cb528f7; version=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <64e28ecf44e46de9f01915a4146706a21c3469d2; version=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <994e3e18908f5c4a12d07b44018e6aa85f071048; version=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <a6a7d1541fefddf7ca0cfb34c1bff63ff809cc49; version=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <b2fde8cb2a25125111f2144604e0e7c0ebcc4bba; version=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <b8ed41cc04fb74005aa51d17865ca3d022760335; version=a6a5568c03c4805d4d250f6bd9d468eeeb4ea059 <df5703348813235874d851934e957c3723d71644

Published CVSS scores

8.8Linux Kernel CVE TeamCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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