Deadlock in Linux kernel - CVE-2026-64206
Published: July 21, 2026
Vulnerability identifier: #VU138911
CSH Severity: Medium
CVSS v4: 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]
CVE-ID: CVE-2026-64206
CWE-ID: CWE-833
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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().
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-64206
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.100-1
linux (Debian package) - update to 6.12.100-1