SB2026091754 - Race condition in Linux kernel s390 kvm
Published: September 17, 2026
Security Bulletin ID
SB2026091754
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) Race condition (CVE-ID: CVE-2026-89919)
CWE-ID: CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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 cause memory corruption.
The vulnerability exists due to improper synchronization in the KVM s390 keyop handler when KVM_S390_KEYOP and KVM_S390_VM_MEM_LIMIT_SIZE run concurrently. A local user can invoke these operations concurrently to cause memory corruption.
Remediation
Install update from vendor's website.