CVE-2026-77237
Missing queue-set type validation in xQueueAddToSet() in the FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports with configUSE_QUEUE_SETS=1 to read privileged kernel memory. 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.
⚡ Watch CVE-2026-77237
Get an email if CVE-2026-77237 is added to CISA KEV, gains public exploit code, or a new advisory cites it — max one per day, one-click unsubscribe.
Exploitation outlook
- Low exploitation risk0.12% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 2% of all EPSS-scored CVEs.
Advisory coverage (2)
External references
Embed the live status
— this badge updates automatically when the KEV or exploit status changes. How to embed it →
[](https://www.csirts.com/cve/CVE-2026-77237)