CVE-2026-109588: Freertos Freertos-Kernel

High severity, CVSS 8.8. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Freertos Freertos-Kernel: from 11.3.0, up to and including 11.3.1

Published 2026-10-16. Last modified 2026-10-16.