CVE-2026-77234

Improper input validation in FreeRTOS-Kernel timer command handling

Published: Aug 21, 2026Updated: Aug 27, 2026 Sources: CVE List NVDCWE-863

8.8HIGH

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.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:LAttack Vector

Local

AC:LAttack Complexity

Low

PR:LPrivileges Required

Low

UI:NUser Interaction

None

Scope

S:CScope

Changed

Impact

C:HConfidentiality

High

I:HIntegrity

High

A:HAvailability

High

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Weaknesses

CWE-863

Affected Products

FreeRTOS

oss-projectaka coremqtt, freertos-kernel, freertos-plus-tcp

FreeRTOS-KernelEmbedded

Operating Systems / rtos-embedded-os

amazon

commercial·US

freertosEmbeddedOS

ICS / OT / IoT

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

2 techniques

Initial Access

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References

https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1

github.com

https://aws.amazon.com/security/security-bulletins/2026-086-aws/

aws.amazon.com

https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-w3vr-pr75-5hc6

github.com

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