SB20260406123 - Use-after-free in Linux kernel bluetooth
Published: April 6, 2026
Security Bulletin ID
SB20260406123
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after-free (CVE-ID: CVE-2026-31408)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 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/E:U/U:Clear
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in sco_recv_frame() when processing Bluetooth SCO frames during concurrent socket closure. A local user can trigger a race condition to cause a denial of service.
The issue occurs because the socket reference is not held after releasing sco_conn_lock() before accessing sk->sk_state.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/108b81514d8f2535eb16651495cefb2250528db3
- https://git.kernel.org/stable/c/45aaca995e4a7a05b272a58e7ab2fff4f611b8f1
- https://git.kernel.org/stable/c/598dbba9919c5e36c54fe1709b557d64120cb94b
- https://git.kernel.org/stable/c/7197462e90b8ce15caa1ae15d4bc2bb8cd21b11e
- https://git.kernel.org/stable/c/e76e8f0581ef555eacc11dbb095e602fb30a5361