SB20260325158 - Missing release of memory after effective lifetime in Linux kernel bluetooth

Description

This security bulletin contains information about 1 vulnerability.

1) Missing release of memory after effective lifetime (CVE-ID: CVE-2026-23299)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

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 improper memory management in the Bluetooth socket destructors when handling SKBs in the sk_error_queue. A local user can enable TX timestamping via SO_TIMESTAMPING and avoid reading timestamps, or trigger unexpected controller removal, leading to unprocessed SKBs accumulating in the sk_error_queue and causing memory leakage.

Successful exploitation may result in gradual memory exhaustion, potentially leading to system instability or denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/21e4271e65094172aadd5beb8caea95dd0fbf6d7
• https://git.kernel.org/stable/c/2b6c942a526635f5c61d2f000258e620da32d3a7
• https://git.kernel.org/stable/c/3de7c10a950b36affc692d8bd2ac713852580e56