Description
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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| FreeRTOS | FreeRTOS-Kernel | 11.3.0 – ≤ 11.3.1 | — |
References
- https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.2 release-notes patch
- https://aws.amazon.com/security/security-bulletins/2026-138-aws/ vendor-advisory
- https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-qf4j-6f5j-876g third-party-advisory