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CVE-2026-89443

7.1 · HIGH

In the Linux kernel, the following vulnerability has been resolved: platform/x86: ISST: Validate level in perf mask ioctls isst_if_get_perf_level_mask() and isst_if_get_base_freq_mask() use the u…

Published Sep 11, 2026EPSS 0.16%

Overview

CVE-2026-89443 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

platform/x86: ISST: Validate level in perf mask ioctls

isst_if_get_perf_level_mask() and isst_if_get_base_freq_mask() use the

user-provided level as an index into perf_levels[] via

_read_pp_level_info() and _read_bf_level_info(), but neither helper

validates it first.

The adjacent level-info helpers reject levels above max_level before

reading the same per-level register block. Add the same bounds checks to

the mask helpers, and reject disabled SST-PP levels in

isst_if_get_perf_level_mask() to match isst_if_get_perf_level_info().

This prevents out-of-bounds reads from the per-level offset table on

invalid ioctl input.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1889a9156553f0692acd57caf15e877baace1a01Refgit.kernel.org/stable/c/1a8bab5ceee1a42a78de12d3d69f67516a20588eRefgit.kernel.org/stable/c/80e0d353c86a9a168ad6d213f494796294381538Refgit.kernel.org/stable/c/beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68Refgit.kernel.org/stable/c/d19385624bdfb577db9c94bb8879992fd5e17bcd

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89443?

CVE-2026-89443 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 7.1 (HIGH).

How severe is CVE-2026-89443?

This vulnerability has a CVSS 3.1 base score of 7.1, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-89443?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-89443?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89443 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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