CVE-2023-53305

Kernel compromise via unheld L2CAP channel

Published Sep 16, 2025 · Updated Aug 5, 2026

Use-after-free in Linux kernel Bluetooth L2CAP before 6.5 allows physically proximate attackers to compromise or crash the kernel. l2cap_le_command_rej obtains a channel by identifier, then deletes and unlocks it without first holding a reference, allowing concurrent release. An established Bluetooth LE peer needs no pairing or encryption and can use a pending LE CoC identifier to trigger kernel memory access or panic.

CVSS severity8.8
High
EPSS probability0.22%
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 Linux kernel Bluetooth L2CAP before 6.5 allows physically proximate attackers to compromise or crash the kernel. l2cap_le_command_rej obtains a channel by identifier, then deletes and unlocks it without first holding a reference, allowing concurrent release. An established Bluetooth LE peer needs no pairing or encryption and can use a pending LE CoC identifier to trigger kernel memory access or panic.

The record

CVE
CVE-2023-53305
Published
Sep 16, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1203
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 2026Record 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=3.14
  2. Affected versionversion=71fb419724fadab4efdf98210aa3fe053bd81d29 <149daab45922ab1ac7f0cbeacab7251a46bf5e63
  3. Affected versionversion=71fb419724fadab4efdf98210aa3fe053bd81d29 <1a40c56e8bff3e424724d78a9a6b3272dd8a371d
  4. Affected versionversion=71fb419724fadab4efdf98210aa3fe053bd81d29 <255be68150291440657b2cdb09420b69441af3d8
  5. Affected versionversion=71fb419724fadab4efdf98210aa3fe053bd81d29 <2958cf9f805b9f0bdc4a761bf6ea281eb8d44f8e
  6. Affected versionversion=71fb419724fadab4efdf98210aa3fe053bd81d29 <548a6b64b3c0688f01119a6fcccceb41f8c984e4
  7. Affected versionversion=71fb419724fadab4efdf98210aa3fe053bd81d29 <e76bab1b7afa580cd76362540fc37551ada4359b
  8. Affected versionversion=71fb419724fadab4efdf98210aa3fe053bd81d29 <f752a0b334bb95fe9b42ecb511e0864e2768046f
  9. Affected versionversion=71fb419724fadab4efdf98210aa3fe053bd81d29 <fe49aa73cca6608714477b74bfc6874b9db979df

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.14; version=71fb419724fadab4efdf98210aa3fe053bd81d29 <149daab45922ab1ac7f0cbeacab7251a46bf5e63; version=71fb419724fadab4efdf98210aa3fe053bd81d29 <1a40c56e8bff3e424724d78a9a6b3272dd8a371d; version=71fb419724fadab4efdf98210aa3fe053bd81d29 <255be68150291440657b2cdb09420b69441af3d8; version=71fb419724fadab4efdf98210aa3fe053bd81d29 <2958cf9f805b9f0bdc4a761bf6ea281eb8d44f8e; version=71fb419724fadab4efdf98210aa3fe053bd81d29 <548a6b64b3c0688f01119a6fcccceb41f8c984e4; version=71fb419724fadab4efdf98210aa3fe053bd81d29 <e76bab1b7afa580cd76362540fc37551ada4359b; version=71fb419724fadab4efdf98210aa3fe053bd81d29 <f752a0b334bb95fe9b42ecb511e0864e2768046f; version=71fb419724fadab4efdf98210aa3fe053bd81d29 <fe49aa73cca6608714477b74bfc6874b9db979df

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
T1203Exploitation for Client Execution

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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