# CVE-2026-119086: Amazon FreeRTOS-Kernel type validation bypass in xQueueSelectFromSet

Source: https://junglewise.ai/threats/cve-2026-119086-missing-type-validation-in-xqueueselectfromset-in-freertos  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-30. Updated: 2026-10-30  
License: CC BY 4.0 with a link back

CVE-2026-119086 · Severity: high · CVSS 6.5 · Published 2026-10-30

FreeRTOS-Kernel is a real-time operating system for embedded devices and microcontrollers. A missing type validation flaw in the queue-set selection path allows unprivileged tasks running on MPU-enabled systems to write beyond intended memory boundaries while the kernel executes in privileged mode, potentially corrupting kernel data and compromising system integrity.

Technologies: [Amazon AWS](https://junglewise.ai/threats/technologies/aws), [Amazon FreeRTOS Kernel](https://junglewise.ai/threats/technologies/freertos-kernel). Vendors: [Amazon](https://junglewise.ai/threats/vendors/amazon).

## Quick answers

**Is CVE-2026-119086 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-119086 being exploited in the wild.

**How severe is CVE-2026-119086?** High severity, with a CVSS score of 6.5, published 30 October 2026.

**Which products and versions are affected?** Amazon FreeRTOS Kernel V7.4.0 through V11.3.2 (MPU-enabled ports with configUSE_QUEUE_SETS=1).

**Is there a fix for CVE-2026-119086?** Yes: fixed in FreeRTOS-Kernel V11.3.3. Until then: This issue only affects MPU-enabled builds with queue sets enabled (configUSE_QUEUE_SETS=1). If queue sets are not in use, the application is not vulnerable. Disabling queue sets is an alternative to upgrading, though upgrading to the patched version is the recommended remediation. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-119086 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-119086?** Check whether you run Amazon AWS 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.

## How to fix

- Fixed in FreeRTOS-Kernel V11.3.3

This issue only affects MPU-enabled builds with queue sets enabled (configUSE_QUEUE_SETS=1). If queue sets are not in use, the application is not vulnerable. Disabling queue sets is an alternative to upgrading, though upgrading to the patched version is the recommended remediation.

## Technical details

The xQueueSelectFromSet function in FreeRTOS-Kernel does not properly validate that a referenced kernel object is actually a queue set before operating on it. On Memory Protection Unit (MPU)-enabled builds with queue sets enabled (configUSE_QUEUE_SETS=1), an unprivileged task can trigger an out-of-bounds write while the kernel executes in privileged context, violating the security boundary between unprivileged and privileged code. Applications built without queue sets are unaffected.

## Affected products

- Amazon FreeRTOS-Kernel V7.4.0 through V11.3.2 (MPU-enabled ports with configUSE_QUEUE_SETS=1)

## Timeline

- 2026-10-30: disclosed

## References

- [https://aws.amazon.com/security/security-bulletins/rss/2026-158-aws/](https://aws.amazon.com/security/security-bulletins/rss/2026-158-aws/)

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