SB20260816174 - Use-after-free in Linux kernel bluetooth
Published: August 16, 2026
Security Bulletin ID
SB20260816174
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) Use-after-free (CVE-ID: CVE-2026-74540)
CWE-ID: CWE-416 - Use After Free
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 use-after-free in l2cap_le_connect_rsp() in the Bluetooth L2CAP subsystem when handling a crafted LE connect response during channel processing. A remote attacker can trigger a remote disconnect race to cause a denial of service.
Remediation
Install update from vendor's website.
References
- https://git.kernel.org/stable/c/09f447accc2570751e7d17f0dc0788b40d3edade
- https://git.kernel.org/stable/c/522b730c62c53a1981604fd73524697fd347830d
- https://git.kernel.org/stable/c/58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136
- https://git.kernel.org/stable/c/c4740e7f23ff9a8210198d8b4703259e21b9f69d
- https://git.kernel.org/stable/c/fd4c1e301bdec60a40728ea37de531cbccda501a