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9.3

FreeRTOS Kernel may let limited task act with full privileges

CVE-2026-77234 · published 2 months ago
Summary

Versions of the FreeRTOS operating system older than 11.3.1 can let a small program that is supposed to have limited access run as if it had full system rights. This could allow unexpected actions or damage to the device. Update the FreeRTOS kernel to version 11.3.1 or later to fix the issue.

What to do

The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.

Affected software
VendorProductAffected versions
freertos freertos-kernel <= 11.3.0
Original advisory text
Improper input validation in FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports to execute code in privileged kernel context. To remediate this issue, users should ...
Improper input validation in FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports to execute code in privileged kernel context. To remediate this issue, users should upgrade to version 11.3.1 or later.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.3 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-863Incorrect Authorization
Timeline
Published21 Aug 2026
Updated26 Oct 2026
First seen21 Aug 2026
Sources
CVE-2026-77234 · NVD
CVE-2026-77234 · MITRE
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