What’s Vulnerable › Vulnerabilities

CVE-2026-109587: Incorrect authorization in the Arm Cortex-R82 MPU port in FreeRTOS-Kernel

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-16 · updated 2026-10-20
• Weakness: CWE-863

Description

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. To remediate this issue, users should upgrade to version V11.3.2 or later.

Affected products

• FreeRTOS-Kernel: from 11.3.0 through 11.3.1

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-pv9j-rq42-3fjc

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