SB20260325124 - NULL Pointer Dereference in Linux kernel cpufreq driver
Published: March 25, 2026
Security Bulletin ID
SB20260325124
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 security vulnerability.
1) NULL Pointer Dereference (CVE-ID: CVE-2026-23332)
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a NULL pointer dereference in the intel_pstate CPU frequency driver when disabling turbo via the sysfs interface. A local user can write to the /sys/devices/system/cpu/intel_pstate/no_turbo file to cause a kernel crash.
The issue arises because all_cpu_data[] is dereferenced for CPUs that are not online, leading to a NULL pointer dereference when the system is booted with 'nosmt' or 'maxcpus' kernel parameters.
Remediation
Install update from vendor's website.