SB20260406102 - NULL pointer dereference in Linux kernel resctrl driver
Published: April 6, 2026
Security Bulletin ID
SB20260406102
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-2026-23433)
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to a null pointer dereference in mpam_restore_mbwu_state() when restoring bandwidth counters after an MSC supporting memory bandwidth monitoring is brought offline and then online. A local user can trigger the affected restore path to cause a denial of service.
This results in a kernel oops. The issue occurs because a value used by __ris_msmon_read() is not initialized before it is accessed.
Remediation
Install update from vendor's website.