---
id: CVE-2026-109587
title: Incorrect authorization in the Arm Cortex-R82 MPU port in FreeRTOS-Kernel
summary: >-
  Incorrect authorization in the Arm Cortex-R82 (Armv8-R AArch64) MPU port in
  FreeRTOS-Kernel V11.3.0 and V11.3.1 might allow an unprivileged task on
  MPU-enabled builds to read and write privileged kernel memory outside the
  regions assigne…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-863
vendor: FreeRTOS
product: FreeRTOS-Kernel
affected:
  - FreeRTOS-Kernel >= 11.3.0 <= 11.3.1
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:16:01.447Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-109587'
references:
  - url: 'https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.2'
  - url: 'https://aws.amazon.com/security/security-bulletins/2026-138-aws/'
  - url: >-
      https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-pv9j-rq42-3fjc
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.831Z'
epss: 0.00138
epssPercentile: 0.02811
---

## Overview

Incorrect authorization in the Arm Cortex-R82 (Armv8-R AArch64) MPU port in FreeRTOS-Kernel V11.3.0 and V11.3.1 might allow an unprivileged task on MPU-enabled builds to read and write privileged kernel memory outside the regions assigned to it, via a buffer argument passed to an MPU system call.



To remediate this issue, users should upgrade to version V11.3.2 or later.

## Affected

- `FreeRTOS-Kernel >= 11.3.0 <= 11.3.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.