CVE-2026-109588
Numeric truncation in the MPU buffer authorization check in FreeRTOS-Kernel
- State
- Published
- Severity
- 9.3 Critical
- Published
- Oct 16, 2026
- Updated
- Oct 20, 2026
- Reserved
- Oct 12, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H | AMZN |
| 3.1 | 8.8 High | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H | AMZN |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
FreeRTOS-KernelFreeRTOS |
|
References
- https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.2release-notespatch
- https://aws.amazon.com/security/security-bulletins/2026-138-aws/vendor-advisory
- https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-qf4j-6f5j-876gthird-party-advisory
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