CVE-2026-109588

critical · 9.3

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.

9.3

CVSS

0.2%

EPSS (exploit prob.)

5th

EPSS percentile

2026-10-16

Published

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE-125CWE-197CWE-787

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-qf4j-6f5j-876g

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-109588