NULL pointer dereference in Linux kernel - CVE-2026-23433
Published: April 6, 2026
Vulnerability identifier: #VU124938
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-23433
CWE-ID: CWE-476
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-23433
Install security update from vendor's repository.