CVE-2026-77236
Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate this issue, users should upgrade to version 11.3.1 or later.
CSIRTS triage
- What
- Four privilege escalation and memory safety issues in FreeRTOS-Kernel affecting MPU, ARM TrustZone, and queue set configurations.
- Who is affected
- Microcontroller and embedded systems deployments using affected FreeRTOS-Kernel versions with MPU, ARM TrustZone secure contexts, or queue sets enabled.
- Urgency
- High; privilege escalation in embedded real-time systems can compromise device security and control; applicable only to specific configurations.
- Action
- Upgrade to patched FreeRTOS-Kernel version from AWS; verify if your build uses affected features (MPU, TrustZone, queue sets).
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.11% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 1% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
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[](https://www.csirts.com/cve/CVE-2026-77236)