FreeRTOS Kernel up to 11.3.2 Queue Set Selection queue-set selection system call stack-based overflow

Summaryinfo

A vulnerability identified as very critical has been detected in FreeRTOS Kernel up to 11.3.2. This affects the function queue-set selection system call of the component Queue Set Selection. This manipulation causes stack-based overflow. This vulnerability is tracked as CVE-2026-119086. The attack is restricted to local execution. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in FreeRTOS Kernel up to 11.3.2 and classified as very critical. Affected by this vulnerability is the function queue-set selection system call of the component Queue Set Selection. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-119086 since 10/29/2026. The exploitation appears to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/30/2026).

Upgrading to version 11.3.3 eliminates this vulnerability.

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Productinfo

Vendor

• FreeRTOS

Name

• Kernel

Version

• 11.3.0
• 11.3.1
• 11.3.2

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CPE 2.2info

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