# CVE-2026-89588

## Summary

- **CVE ID:** CVE-2026-89588
- **Severity:** HIGH
- **CVSS Score:** 8.4 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 13, 2026

## 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.

## Affected Products

- Linux — Linux (242c652849d979d0133c315a42d9acea0ff88390)
- Linux — Linux (136093ba4161e0080088abff48273f6830a47766)
- Linux — Linux (87880af2d24e62a84ed19943dbdd524f097172f2)
- Linux — Linux (db103b8bd3a4aca69b1b5fe8831a6ed75ac4b3bd)
- Linux — Linux (6.12.75)
- Linux — Linux (6.18.16)
- Linux — Linux (6.19.6)
- Linux — Linux (7.0)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/5ff385e9403e87ae33f65b8c38698d3b1e92cfde)
- [CNA](https://git.kernel.org/stable/c/452eb28e03015abec6d4bf6488ee567706ade4e1)
- [CNA](https://git.kernel.org/stable/c/b48b613073c3d652cb1823c15d16f7067cf4cee4)
- [CNA](https://git.kernel.org/stable/c/903308ea40adf0577d82eab69882faf8836326ce)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.18%
- **EPSS Percentile:** 8.1

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._