SB20260812123 - Use-after-free in Linux kernel core
Published: August 12, 2026
Security Bulletin ID
SB20260812123
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-2026-68399)
CWE-ID: CWE-416 - Use After Free
CVSSv4: 6.8 [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]
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a use-after-free in sk_clone() and BPF socket local storage handling when cloning sockets and an early bailout occurs before BPF storage cloning. A local user can trigger socket cloning that fails before storage initialization completes to cause a denial of service.
Only systems with BPF syscall support enabled are vulnerable.
Remediation
Install update from vendor's website.