SB20260720115 - Improper locking in Linux kernel security
Published: July 20, 2026
Security Bulletin ID
SB20260720115
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-64111)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a local user to bypass security restrictions.
The vulnerability exists due to improper locking in lsm_set_self_attr() when setting a process security attribute. A local user can invoke the syscall while the process is being ptraced to bypass security restrictions.
This affects SELinux and AppArmor checks related to ptrace during security context transitions.
Remediation
Install update from vendor's website.