# CVE-2026-109587: Incorrect authorization in the Arm Cortex-R82 MPU port in FreeRTOS-Kernel

> CVE-2026-109587: Incorrect authorization in the Arm Cortex-R82 MPU port in FreeRTOS-Kernel. CVSS 8.8 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2026-109587
Last updated: 2026-10-20T16:17:00Z

- Published: 2026-10-16 17:08 UTC · Updated: 2026-10-20 16:17 UTC · Assigner: AMZN
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- EPSS: 0.14%, 3th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-863

## Description

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 vendors and products

- FreeRTOS: FreeRTOS-Kernel

## Tracked companies

- [Amazon Web Services](https://rewindex.com/company/aws.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-109587)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-109587)
- [https://aws.amazon.com/security/security-bulletins/2026-138-aws/](https://aws.amazon.com/security/security-bulletins/2026-138-aws/)
- [https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.2](https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.2)
- [https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-pv9j-rq42-3fjc](https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-pv9j-rq42-3fjc)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2026-109587 · Markdown: https://rewindex.com/cve/CVE-2026-109587.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-109587 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:12:05.714Z