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CVE-2026-89588

8.4 · HIGH

In the Linux kernel, the following vulnerability has been resolved: ACPI: APEI: GHES: fix ARM section length accounting after header In ghes_handle_arm_hw_error(), after skipping the cper_sec_pro…

Published Sep 11, 2026EPSS 0.18%

Overview

CVE-2026-89588 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical description

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

ACPI: APEI: GHES: fix ARM section length accounting after header

In ghes_handle_arm_hw_error(), after skipping the cper_sec_proc_arm

header with (err + 1), the remaining length was reduced by sizeof(err)

(pointer size) instead of sizeof(*err) (structure size).

That overestimates the bytes left for cper_arm_err_info records and can

let the parser read past the CPER section when err_info_num is large

enough relative to error_data_length.

Use sizeof(*err) so the length accounting matches the pointer advance

and the earlier sizeof(*err) size check.

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/452eb28e03015abec6d4bf6488ee567706ade4e1Refgit.kernel.org/stable/c/5ff385e9403e87ae33f65b8c38698d3b1e92cfdeRefgit.kernel.org/stable/c/903308ea40adf0577d82eab69882faf8836326ceRefgit.kernel.org/stable/c/b48b613073c3d652cb1823c15d16f7067cf4cee4

How CyberStrike helps

Frequently asked questions

What is CVE-2026-89588?

CVE-2026-89588 is a high-severity vulnerability. It was published on September 11, 2026 and has a CVSS 3.1 base score of 8.4 (HIGH).

How severe is CVE-2026-89588?

This vulnerability has a CVSS 3.1 base score of 8.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-89588?

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-2026-89588?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-89588 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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