CVE-2026-109588CWE-125CWE-197CWE-787

CVE-2026-109588

High · published October 16, 2026

CVSS v3.1
8.8
EPSS
0%
Percentile
1.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v4.0
9.3 · 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
EPSS
0.00121 · 1.8th percentile
Weaknesses
CWE-125 · Out-of-bounds Read; CWE-197 · Numeric Truncation Error; CWE-787 · Out-of-bounds Write
Published
2026-10-16T22:17Z
References (3)
https://aws.amazon.com/security/security-bulletins/2026-138-aws/ · ff89ba41-3aa1-4d27-914a-91399e9639e5https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.2 · ff89ba41-3aa1-4d27-914a-91399e9639e5https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-qf4j-6f5j-876g · ff89ba41-3aa1-4d27-914a-91399e9639e5
EPSS history
Timeline
  • 18 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 16 OCT 17:09Z
    Numeric truncation in the MPU buffer authorization check in FreeRTOS-Kernel
    cvelistv5
  • 16 OCT 17:09Z
    Numeric truncation in the MPU buffer authorization check in FreeRTOS-Kernel
    cvelistv5