SB20260727137 - Use-after-free in Linux kernel bluetooth

CSH
CYBERSECURITY HELP
Sign In REGISTER

Main Vulnerability Database SB20260727137

SB20260727137 - Use-after-free in Linux kernel bluetooth

Published: July 27, 2026

Security Bulletin ID SB20260727137
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Use-after-free (CVE-ID: CVE-2026-64434)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in the Bluetooth L2CAP channel timeout handler when processing an asynchronous channel timeout after the associated connection has been torn down. A local user can trigger a channel timeout race to cause a denial of service.

The issue arises because the timeout worker may access chan->conn after the underlying connection object has already been freed.


Remediation

Install update from vendor's website.

References