CVE-2026-77236 Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel
Local attackers can corrupt secure-world heap metadata via out-of-bounds write in FreeRTOS-Kernel, potentially leading to code execution or privilege escalation.
- 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-2026-77236?
CVE-2026-77236 is a high-severity memory corruption 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
Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate this issue, users should upgrade to version 11.3.1 or later.
Weakness: CWE-787
Which versions are affected by CVE-2026-77236?
It affects 1 product.
Products include Amazon Freertos.
How do I fix CVE-2026-77236?
No fix has been published for CVE-2026-77236 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-77236 being exploited?
There is no known exploitation of CVE-2026-77236 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-2026-77234 Improper input validation in FreeRTOS-Kernel timer command handling
- CVE-2024-28115 Privilege Escalation in FreeRTOS Kernel ARMv7-M MPU ports and ARMv8-M ports with MPU support enabled