SB2026091670 - Improper locking in Linux kernel block zram driver
Published: September 16, 2026
Security Bulletin ID
SB2026091670
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-90043)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to compromise confidentiality, integrity, and availability.
The vulnerability exists due to improper locking in the zram slot-locking mechanism when access-time values are stored for zram slots. A local user can trigger concurrent access to the same zram slot to compromise confidentiality, integrity, and availability.
The issue affects 64-bit big-endian systems when zram access-time tracking is enabled.
Remediation
Install update from vendor's website.