CVE-2026-77235 Missing privilege check in SecureContext_FreeContext in FreeRTOS-Kernel
Local attackers can trigger a use-after-free in secure memory via the SVC handler, potentially leading to code execution or privilege escalation in FreeRTOS systems.
- 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-2026-77235?
CVE-2026-77235 is a high-severity use after free 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 privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might allow local users to cause a use-after-free condition in secure-world memory via the SVC handler for secure context deallocation. To remediate this issue, users should upgrade to version 11.3.1 or later.
Weakness: CWE-416
Which versions are affected by CVE-2026-77235?
It affects 1 product.
Products include Amazon Freertos.
How do I fix CVE-2026-77235?
No fix has been published for CVE-2026-77235 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-77235 being exploited?
There is no known exploitation of CVE-2026-77235 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