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8.4

FreeRTOS Kernel allows unprivileged task to tamper with protected memory

CVE-2026-109587 · published 12 days ago
Summary

A bug in FreeRTOS Kernel version 11.3.0 and 11.3.1 can let a low‑privilege task read or change kernel memory it should not access. This could let malicious code compromise the system’s core functions. Upgrade to FreeRTOS Kernel version 11.3.2 or newer to fix the problem.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
freertos freertos-kernel <= 11.3.1
Original advisory text
Incorrect authorization in the Arm Cortex-R82 MPU port in FreeRTOS-Kernel
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.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
8.4 High
Exploitation
<1% chance of attack within 30 days
Type
CWE-863Incorrect Authorization
Timeline
Published16 Oct 2026
Updated26 Oct 2026
First seen16 Oct 2026
Sources
CVE-2026-109587 · NVD
CVE-2026-109587 · MITRE
CVE-2026-109587 · OSV
GHSA-pv9j-rq42-3fjc · GHSA
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