Numeric Truncation Error in FreeRTOS - CVE-2026-109588
Published: November 9, 2026
Vulnerability identifier: #VU162912
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-109588
CWE-ID: CWE-197
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker with low privileges to bypass MPU-enforced task isolation and escalate privileges in FreeRTOS-Kernel.
The vulnerability exists due to buffer-length truncation in the Arm Cortex-R82 MPU authorization check when an unprivileged task invokes a stream buffer system call with configENABLE_MPU=1. A local attacker with low privileges can supply a buffer extending beyond the validated window to read or write privileged kernel memory.
Affected software
FreeRTOS
How to mitigate CVE-2026-109588
Install security update from vendor's website.
FreeRTOS - update to 11.3.2