SB2026091716 - Improper locking in Linux kernel s390 crypto driver
Published: September 17, 2026
Security Bulletin ID
SB2026091716
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Partial DoS
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper locking (CVE-ID: CVE-2026-89956)
CWE-ID: CWE-667 - Improper Locking
CVSSv4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
The vulnerability allows a local user to cause kernel memory corruption or a use-after-free condition.
The vulnerability exists due to improper locking in the s390 VFIO AP mediated-device list handling when concurrently creating, removing, or looking up mediated devices. A local user can concurrently manipulate mediated devices to cause kernel memory corruption or a use-after-free condition.
Remediation
Install update from vendor's website.