SB2026110310 - Time-of-check Time-of-use (TOCTOU) Race Condition in Linux kernel bluetooth

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Main Vulnerability Database SB2026110310

SB2026110310 - Time-of-check Time-of-use (TOCTOU) Race Condition in Linux kernel bluetooth

Published: November 3, 2026

Security Bulletin ID SB2026110310
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Code execution

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Time-of-check Time-of-use (TOCTOU) Race Condition (CVE-ID: CVE-2026-99239)

CWE-ID: CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]


The vulnerability allows a local user to potentially disclose sensitive information, modify system data, or cause a denial of service.

The vulnerability exists due to a time-of-check time-of-use race condition in the Linux kernel Bluetooth L2CAP channel management code when binding and connecting a socket concurrently. A local user can race bind and connect operations to link the same channel to a connection more than once, violating assumptions used during channel cleanup and potentially compromising system confidentiality, integrity, and availability.


Remediation

Install update from vendor's website.

References