CVE-2026-77234

Description

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.

CVSS Metrics

• v4.0•CRITICAL•Score: 9.3CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
• v4.0•CRITICAL•Score: 9.3CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
• v3.1•HIGH•Score: 8.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Techniques & Countermeasures

• CWE-863•Incorrect Authorization

  The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Affected Systems

• freertos•freertos-kernel

  ≥ 7.0.0, ≤ 11.3.0

References (3)

• https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1
• https://aws.amazon.com/security/security-bulletins/2026-086-aws/
• https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-w3vr-pr75-5hc6