Vulnerability · Published Oct 30, 2026 · Assigned by AMZN

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

Medium 6.5

In plain English

A medium-severity type confusion in FreeRTOS-Kernel from FreeRTOS. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 3.1)6.5Medium

Exploit odds (30 days)0.2%top 95.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
FreeRTOS	FreeRTOS-Kernel	7.4.0 – through 11.3.2

Weakness: CWE-843, CWE-121 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

References

https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.3 release-notes, patch
https://aws.amazon.com/security/security-bulletins/2026-158-aws/ vendor-advisory
https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-56j9-g43f-8g6v third-party-advisory