{"id":"CVE-2026-109588","state":"PUBLISHED","title":"Numeric truncation in the MPU buffer authorization check in FreeRTOS-Kernel","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.\n\n\n\nTo remediate this issue, users should upgrade to version V11.3.2 or later.","publishedAt":"2026-10-16T17:09:51.788Z","updatedAt":"2026-10-20T18:08:02.113Z","severity":{"score":9.3,"label":"Critical","version":"4.0","vector":"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","source":"AMZN"},"assigner":"AMZN","products":["FreeRTOS 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