SB20260916124 - Improper Check for Unusual or Exceptional Conditions in Linux kernel arm64 kernel
Published: September 16, 2026
Security Bulletin ID
SB20260916124
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) Improper Check for Unusual or Exceptional Conditions (CVE-ID: CVE-2026-89981)
CWE-ID: CWE-754 - Improper Check for Unusual or Exceptional Conditions
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 improper feature-state validation in __cpuinfo_store_cpu() when bringing an offlined CPU back online under pKVM with MTE disabled. A local privileged user can cause a CPU to be offlined and brought back online to cause a denial of service.
Remediation
Install update from vendor's website.