SB20260912343 - Improper Validation of Specified Quantity in Input in Linux kernel intel speed_select_if driver
Published: September 12, 2026
Security Bulletin ID
SB20260912343
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Improper Validation of Specified Quantity in Input (CVE-ID: CVE-2026-89438)
CWE-ID: CWE-1284 - Improper Validation of Specified Quantity in Input
CVSSv4: 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]
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.
Remediation
Install update from vendor's website.