CVE-2026-77234 Improper input validation in FreeRTOS-Kernel timer command handling
An unprivileged task can execute code in privileged kernel context on MPU-enabled FreeRTOS ports due to improper input validation.
- 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-2026-77234?
CVE-2026-77234 is a critical vulnerability in FreeRTOS-Kernel, published on 21 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Improper input validation in FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports to execute code in privileged kernel context. To remediate this issue, users should upgrade to version 11.3.1 or later.
Weakness: CWE-863
Which versions are affected by CVE-2026-77234?
It affects 1 product.
Products include Amazon Freertos.
How do I fix CVE-2026-77234?
No fix has been published for CVE-2026-77234 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-77234 being exploited?
There is no known exploitation of CVE-2026-77234 in the wild and no public exploit code.
Other vulnerabilities in FreeRTOS-Kernel
- CVE-2021-32020 Memory corruption in n/a
- CVE-2021-31571 Integer overflow in n/a
- CVE-2021-31572 Integer overflow in n/a
- CVE-2024-28115 Privilege Escalation in FreeRTOS Kernel ARMv7-M MPU ports and ARMv8-M ports with MPU support enabled
- CVE-2026-77235 Missing privilege check in SecureContext_FreeContext in FreeRTOS-Kernel