---
title: "CVE-2026-89731: Linux Kernel - Out-of-Bounds Read"
description: "Linux kernel contains an out-of-bounds read vulnerability in cxl_rch_get_aer_info() caused by reading beyond the physical AER register block due to struct size mismatch, letting attackers cause out-of-bounds memory access, exploit requires local code execution."
url: https://panop.io/threat-heartbeat/CVE-2026-89731/
---

# CVE-2026-89731 Linux Kernel - Out-of-Bounds Read

Linux kernel contains an out-of-bounds read vulnerability in cxl\_rch\_get\_aer\_info() caused by reading beyond the physical AER register block due to struct size mismatch, letting attackers cause out-of-bounds memory access, exploit requires local code execution.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.16% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89731)

## Details

Type

Out-of-Bounds Read

Impact

Information Disclosure, Denial Of Service

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for cxl\_rch\_get\_aer\_info() out-of-bounds read.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-89731](https://nvd.nist.gov/vuln/detail/CVE-2026-89731)
- [https://git.kernel.org/stable/c/7f5a2a330dde8e8aa2dd80e1f3e05b6ada049607](https://git.kernel.org/stable/c/7f5a2a330dde8e8aa2dd80e1f3e05b6ada049607)
- [https://git.kernel.org/stable/c/29458e62d0829cbc99435f3e44fd560f9bbf1da7](https://git.kernel.org/stable/c/29458e62d0829cbc99435f3e44fd560f9bbf1da7)
- [https://git.kernel.org/stable/c/8bd3523df1319edc61cd391e695c84a4618516df](https://git.kernel.org/stable/c/8bd3523df1319edc61cd391e695c84a4618516df)
- [https://git.kernel.org/stable/c/8e3d9dbb25d3ddbe72b4542ec4f7c4e622fe0ced](https://git.kernel.org/stable/c/8e3d9dbb25d3ddbe72b4542ec4f7c4e622fe0ced)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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