Improper Validation of Specified Quantity in Input in Linux kernel - CVE-2026-89438
Published: September 12, 2026
Vulnerability identifier: #VU149365
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-89438
CWE-ID: CWE-1284
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to access unintended MMIO offsets.
The vulnerability exists due to improper validation of CLOS IDs and logical CPU IDs in the ISST core power feature when handling user-supplied CLOS parameter and association commands. A local user can supply out-of-range CLOS IDs or logical CPU IDs to access unintended MMIO offsets.
Affected software
Linux kernel
How to mitigate CVE-2026-89438
Install security update from vendor's repository.