CVE-2026-89438
In the Linux kernel, the following vulnerability has been resolved: platform/x86: ISST: Validate logical CPU id and clos id Validate max CLOS ID and logical CPU ID for core power feature. Reject any clos level or logical CPU number greater than the supported maximum. These are used to calculate MMIO offset.
Affected versions
Linux kernel versions
6.4
and later are affected. Fixed in
6.6.157,
6.12.109,
6.18.50,
7.2.4,
7.3-rc1
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-89438?
CVE-2026-89438 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.4 onward and has been patched in 6.6.157, 6.12.109, 6.18.50 and others. CVE-2026-89438 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-89438?
Yes. CVE-2026-89438 has been patched. Fixed versions include 6.6.157, 6.12.109, 6.18.50 and others. If you are running Linux kernel 6.4 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-89438 actively exploited?
No. CVE-2026-89438 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.