CVE-2026-109587 Incorrect authorization in the Arm Cortex-R82 MPU port in FreeRTOS-Kernel
An unprivileged task can read and write privileged kernel memory via a buffer argument in MPU-enabled builds, requiring an upgrade to fix.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109587?
CVE-2026-109587 is a critical missing authorization vulnerability in FreeRTOS-Kernel, published on 16 Oct 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-863
Which versions are affected by CVE-2026-109587?
How do I fix CVE-2026-109587?
No fix has been published for CVE-2026-109587 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-109587 being exploited?
There is no known exploitation of CVE-2026-109587 in the wild and no public exploit code.
Sources
Also known as GHSA-pv9j-rq42-3fjc.