SB2026072188 - Deadlock in Linux kernel bluetooth
Published: July 21, 2026
Security Bulletin ID
SB2026072188
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Deadlock (CVE-ID: CVE-2026-64206)
CWE-ID: CWE-833 - Deadlock
CVSSv4: 8.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper locking in the Bluetooth L2CAP connection teardown path when canceling pending receive work during connection deletion. A remote attacker can trigger Bluetooth L2CAP traffic and connection teardown to cause a denial of service.
The issue can deadlock between the pending_rx_work worker and the teardown path in l2cap_conn_del().
Remediation
Install update from vendor's website.