Is CVE-2026-77235 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-77235 being exploited in the wild.

How severe is CVE-2026-77235?

High severity, with a CVSS score of 7.3, published 21 August 2026.

Which products and versions are affected?

Amazon FreeRTOS Kernel before 11.3.1.

Is there a fix for CVE-2026-77235?

A patch was published on 2026-08-21: Version 11.3.1 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-77235 attacked?

It is attacked with local access, in a software library.

Am I affected by CVE-2026-77235?

Check whether you run Amazon Freertos or Amazon FreeRTOS Kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-77235: FreeRTOS-Kernel missing privilege verification in secure context cleanup

CVE-2026-77235 · Severity: high · CVSS 7.3 · Published 2026-08-21

FreeRTOS-Kernel is a real-time operating system kernel used in embedded and IoT devices to manage task scheduling and system resources. A missing privilege check in the secure context cleanup handler allows local users to trigger a use-after-free vulnerability in secure memory, potentially leading to privilege escalation or system crashes that could disrupt device operations.

Technologies: Amazon Freertos, Amazon FreeRTOS Kernel. Vendors: Amazon.

Quick answers

Is CVE-2026-77235 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-77235 being exploited in the wild.
How severe is CVE-2026-77235?: High severity, with a CVSS score of 7.3, published 21 August 2026.
Which products and versions are affected?: Amazon FreeRTOS Kernel before 11.3.1.
Is there a fix for CVE-2026-77235?: A patch was published on 2026-08-21: Version 11.3.1 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-77235 attacked?: It is attacked with local access, in a software library.
Am I affected by CVE-2026-77235?: Check whether you run Amazon Freertos or Amazon FreeRTOS Kernel at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is a use-after-free condition in the ARMv8-M secure context cleanup handler due to missing privilege verification. The SVC handler for secure context deallocation (portSVC_FREE_SECURE_CONTEXT) was not validating whether the calling code was privileged before processing the deallocation request. An attacker with local code execution can invoke the SVC handler from unprivileged code to free a secure context that is currently in use, leaving running tasks referencing freed secure memory. The fix, released in version 11.3.1, adds privilege validation to ensure the calling program counter lies within the privileged functions section when MPU is enabled, and rejects requests from unprivileged code.

Affected products

Amazon FreeRTOS-Kernel before 11.3.1

Timeline

2026-08-21: disclosed
2026-08-21: patched: Version 11.3.1 released

References

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