Medium [CVE-2026-89438] Linux kernel: ISST input validation flaw may lead to memory corruption
This medium-severity Red Hat Linux advisory covers CVE-2026-89438.
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Summary
A flaw was found in the Linux kernel, specifically within the Intel Speed Select Technology (ISST) component. This vulnerability arises from insufficient validation of input values, such as logical CPU ID and CLOS ID, used in the core power feature.
A local attacker could exploit this by providing invalid input, which might lead to incorrect calculations for memory-mapped I/O (MMIO) offsets. This could result in memory corruption, potentially allowing for system instability, unauthorized information access, or an increase in privileges.
Red Hat severity: Moderate — CVSS 4.7 (CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H). Weakness: CWE-787.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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