CVE-2026-109588
HighCVSS 8.8Summary
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.
Risk Assessment
An unprivileged task can access privileged kernel memory, leading to privilege escalation and potential system compromise. This poses a serious threat to the integrity and confidentiality of the embedded system.
Recommendation
Upgrade FreeRTOS-Kernel to version V11.3.2 or later. Until patched, consider restricting unprivileged tasks on MPU-enabled builds.
Other vulnerabilities in FreeRTOS-Kernel
See all- CVE-2026-109587High
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.
- CVE-2026-77237Medium
Missing queue-set type validation in xQueueAddToSet() in the FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports with configUSE_QUEUE_SETS=1 to read privileged kernel memory. To remediate this issue, users should upgrade to version 11.3.1 or later.
- CVE-2026-77236High
FreeRTOS-Kernel before version 11.3.1 lacks minimum size validation in secure context allocation, which might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter.
- CVE-2026-77235High
FreeRTOS-Kernel before version 11.3.1 lacks privilege verification in the secure context cleanup handler, which might allow local users to cause a use-after-free condition in secure-world memory via the SVC handler for secure context deallocation.
- CVE-2026-77234High
FreeRTOS-Kernel before version 11.3.1 has improper input validation, which might allow an unprivileged task on MPU-enabled ports to execute code in privileged kernel context.
Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS