CVE-2026-77234

Improper input validation in FreeRTOS-Kernel timer command handling

State: Published
Severity: 9.3 Critical
Published: Aug 21, 2026
Updated: Aug 27, 2026
Reserved: Aug 20, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	9.3 Critical	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H	AMZN
3.1	8.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	AMZN

Weaknesses

CWE-863 Incorrect Authorization

Affected Products

Product	Versions
FreeRTOS-KernelFreeRTOS	7.0.0 through 11.3.0Affected

References

https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1patch
https://aws.amazon.com/security/security-bulletins/2026-086-aws/vendor-advisory
https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-w3vr-pr75-5hc6third-party-advisory

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