CVE-2026-77237 Missing type validation in xQueueAddToSet in FreeRTOS-Kernel
An unprivileged task can read privileged kernel memory due to missing type validation in FreeRTOS-Kernel when queue sets are enabled.
- 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-2026-77237?
CVE-2026-77237 is a high-severity missing authorization 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 queue-set type validation in xQueueAddToSet() in the FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports with configUSE_QUEUE_SETS=1 to read privileged kernel memory. To remediate this issue, users should upgrade to version 11.3.1 or later.
Which versions are affected by CVE-2026-77237?
It affects 1 product.
Products include Amazon Freertos.
How do I fix CVE-2026-77237?
No fix has been published for CVE-2026-77237 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-2026-77237 being exploited?
There is no known exploitation of CVE-2026-77237 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