CVE-2024-56605

Use-after-free via dangling L2CAP socket pointer

Published Dec 27, 2024 · Updated Aug 5, 2026

Use-after-free in the Linux kernel Bluetooth L2CAP stack since 3.6 allows local users to trigger a dangling pointer during socket creation. On an allocation error, l2cap_sock_alloc() frees the socket object but leaves the freed sk pointer attached to the caller-supplied sock object. Exploitation requires local low-privileged access and a failing allocation; Ubuntu reports that sock->ops is NULL and the dangling pointer is never dereferenced.

CVSS severity7.8
High
EPSS probability0.24%
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 the Linux kernel Bluetooth L2CAP stack since 3.6 allows local users to trigger a dangling pointer during socket creation. On an allocation error, l2cap_sock_alloc() frees the socket object but leaves the freed sk pointer attached to the caller-supplied sock object. Exploitation requires local low-privileged access and a failing allocation; Ubuntu reports that sock->ops is NULL and the dangling pointer is never dereferenced.

The record

CVE
CVE-2024-56605
Published
Dec 27, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2024CVE 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=3.6
  2. Affected versionversion=49dfbb9129c4edb318578de35cc45c555df37884 <61686abc2f3c2c67822aa23ce6f160467ec83d35
  3. Affected versionversion=49dfbb9129c4edb318578de35cc45c555df37884 <7c4f78cdb8e7501e9f92d291a7d956591bf73be9
  4. Affected versionversion=49dfbb9129c4edb318578de35cc45c555df37884 <8ad09ddc63ace3950ac43db6fbfe25b40f589dd6
  5. Affected versionversion=49dfbb9129c4edb318578de35cc45c555df37884 <a8677028dd5123e5e525b8195483994d87123de4
  6. Affected versionversion=49dfbb9129c4edb318578de35cc45c555df37884 <bb2f2342a6ddf7c04f9aefbbfe86104cd138e629
  7. Affected versionversion=49dfbb9129c4edb318578de35cc45c555df37884 <daa13175a6dea312a76099066cb4cbd4fc959a84
  8. Affected versionversion=49dfbb9129c4edb318578de35cc45c555df37884 <f6ad641646b67f29c7578dcd6c25813c7dcbf51e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.6; version=49dfbb9129c4edb318578de35cc45c555df37884 <61686abc2f3c2c67822aa23ce6f160467ec83d35; version=49dfbb9129c4edb318578de35cc45c555df37884 <7c4f78cdb8e7501e9f92d291a7d956591bf73be9; version=49dfbb9129c4edb318578de35cc45c555df37884 <8ad09ddc63ace3950ac43db6fbfe25b40f589dd6; version=49dfbb9129c4edb318578de35cc45c555df37884 <a8677028dd5123e5e525b8195483994d87123de4; version=49dfbb9129c4edb318578de35cc45c555df37884 <bb2f2342a6ddf7c04f9aefbbfe86104cd138e629; version=49dfbb9129c4edb318578de35cc45c555df37884 <daa13175a6dea312a76099066cb4cbd4fc959a84; version=49dfbb9129c4edb318578de35cc45c555df37884 <f6ad641646b67f29c7578dcd6c25813c7dcbf51e

Published CVSS scores

7.8Linux kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0OracleCVSS:3.1/AV:L/AC:H/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

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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-416Use After Free
T1068Exploitation for Privilege Escalation

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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