CVE-2026-109588

HIGH 8.8

Numeric truncation in the MPU buffer authorization check in FreeRTOS-Kernel

CVSS Score

8.8

EPSS Score

0.0%

EPSS Percentile

0th

Numeric truncation of the buffer length in the MPU buffer authorization check in FreeRTOS-Kernel V11.3.0 and V11.3.1 on the Arm Cortex-R82 (Armv8-R AArch64) MPU port might allow, under certain conditions, an unprivileged task on MPU-enabled builds to read or write privileged kernel memory beyond the validated buffer window, via a stream buffer system call. To remediate this issue, users should upgrade to version V11.3.2 or later.

CWE	CWE-197 CWE-787 CWE-125
Vendor	freertos
Product	freertos-kernel
Published	Oct 16, 2026
Last Updated	Oct 16, 2026

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CVSS v3 Breakdown

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

FreeRTOS / FreeRTOS-Kernel

11.3.0 ≤ 11.3.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.2 aws.amazon.com: https://aws.amazon.com/security/security-bulletins/2026-138-aws/ github.com: https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-qf4j-6f5j-876g

Credits

Ada Logics Ltd Anthropic