CVE-2026-109588

CVSS 9.3 (critical) · published 2026-10-16

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.

Weakness: CWE-125, CWE-197, CWE-787

Source: NVD CVE-2026-109588

References

• 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/security/advisories/GHSA-qf4j-6f5j-876g

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