What’s Vulnerable › Vulnerabilities

CVE-2026-77234: Improper input validation in FreeRTOS-Kernel timer command handling

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-21 · updated 2026-10-14
• Weakness: CWE-863

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.

Affected products

• FreeRTOS-Kernel: from 7.0.0 before 11.3.1 — fixed in 11.3.1

How to fix

Upgrade to a fixed version: FreeRTOS-Kernel 11.3.1. Check the vendor advisory for mitigations.

References

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

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