SB20260912334 - NULL pointer dereference in Linux kernel s390 kernel
Published: September 12, 2026
Security Bulletin ID
SB20260912334
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) NULL pointer dereference (CVE-ID: CVE-2026-89460)
CWE-ID: CWE-476 - NULL Pointer Dereference
CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local privileged user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in the s390 CPUMF performance monitoring unit when a CPU is added while a per-task CPUMF performance event is running. A local privileged user can trigger CPU hotplug during execution of a per-task performance event to cause a denial of service.
Remediation
Install update from vendor's website.