CVE-2024-27399

System crash via L2CAP channel deletion race

Published May 13, 2024 · Updated May 11, 2026

NULL pointer dereference in affected Linux kernel releases beginning with 3.4 allows local users to crash the kernel through Bluetooth L2CAP activity. A race lets l2cap_chan_del() clear chan->conn while l2cap_chan_timeout() subsequently dereferences that pointer when locking the connection. A low-privileged local context and the affected Bluetooth path are required; successful triggering causes a kernel Oops and service interruption.

CVSS severity5.5
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in affected Linux kernel releases beginning with 3.4 allows local users to crash the kernel through Bluetooth L2CAP activity. A race lets l2cap_chan_del() clear chan->conn while l2cap_chan_timeout() subsequently dereferences that pointer when locking the connection. A low-privileged local context and the affected Bluetooth path are required; successful triggering causes a kernel Oops and service interruption.

The record

CVE
CVE-2024-27399
Published
May 13, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3.4
  2. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <06acb75e7ed600d0bbf7bff5628aa8f24a97978c
  3. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <6466ee65e5b27161c846c73ef407f49dfa1bd1d9
  4. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <8960ff650aec70485b40771cd8e6e8c4cb467d33
  5. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <955b5b6c54d95b5e7444dfc81c95c8e013f27ac0
  6. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <adf0398cee86643b8eacde95f17d073d022f782c
  7. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <e137e2ba96e51902dc2878131823a96bf8e638ae
  8. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <e97e16433eb4533083b096a3824b93a5ca3aee79
  9. Affected versionversion=3df91ea20e744344100b10ae69a17211fcf5b207 <eb86f955488c39526534211f2610e48a5cf8ead4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.4; version=3df91ea20e744344100b10ae69a17211fcf5b207 <06acb75e7ed600d0bbf7bff5628aa8f24a97978c; version=3df91ea20e744344100b10ae69a17211fcf5b207 <6466ee65e5b27161c846c73ef407f49dfa1bd1d9; version=3df91ea20e744344100b10ae69a17211fcf5b207 <8960ff650aec70485b40771cd8e6e8c4cb467d33; version=3df91ea20e744344100b10ae69a17211fcf5b207 <955b5b6c54d95b5e7444dfc81c95c8e013f27ac0; version=3df91ea20e744344100b10ae69a17211fcf5b207 <adf0398cee86643b8eacde95f17d073d022f782c; version=3df91ea20e744344100b10ae69a17211fcf5b207 <e137e2ba96e51902dc2878131823a96bf8e638ae; version=3df91ea20e744344100b10ae69a17211fcf5b207 <e97e16433eb4533083b096a3824b93a5ca3aee79; version=3df91ea20e744344100b10ae69a17211fcf5b207 <eb86f955488c39526534211f2610e48a5cf8ead4

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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