SB20261023154 - Deadlock in Linux kernel bluetooth rfcomm

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Main Vulnerability Database SB20261023154

SB20261023154 - Deadlock in Linux kernel bluetooth rfcomm

Published: October 23, 2026

Security Bulletin ID SB20261023154
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Partial DoS

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Deadlock (CVE-ID: CVE-2026-99009)

CWE-ID: CWE-833 - Deadlock

CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service by triggering a deadlock in Bluetooth RFCOMM processing.

The vulnerability exists due to inconsistent lock ordering in the Linux kernel Bluetooth RFCOMM subsystem when establishing an RFCOMM connection while a BR/EDR link is being authenticated. A local user can issue an RFCOMM socket connect() call from userspace to trigger circular acquisition of rfcomm_mutex and hdev->lock, potentially deadlocking Bluetooth processing.


Remediation

Install update from vendor's website.

References