SB20260816184 - Use-after-free in Linux kernel bluetooth
Published: August 16, 2026
Security Bulletin ID
SB20260816184
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-2026-74531)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to use-after-free in abort_conn_sync() in net/bluetooth/hci_conn.c when handling Bluetooth connection abort operations. A local user can trigger a connection abort race to cause a denial of service.
The issue is theoretical and occurs if the connection object is freed while the hci_sync task is running.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/5761d003daa987ac81463f570713ce9c9dd204e5
- https://git.kernel.org/stable/c/64d1645f26aa49b5a86ba2fccd0bb6749ea725a6
- https://git.kernel.org/stable/c/963fb4b8e7d1ab07b4ae45bf15d41e667c88caca
- https://git.kernel.org/stable/c/e8f9fef362bab431d95371d3406bc720350290c3
- https://git.kernel.org/stable/c/fa812cfa81aa3d4a7b6ce8277979af57b3f79712