CVE-2026-77236

Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel

State: Published
Severity: 8.3 High
Published: Aug 21, 2026
Updated: Aug 21, 2026
Reserved: Aug 20, 2026

Description

Missing minimum size validation in secure context allocation in FreeRTOS-Kernel before 11.3.1 might allow local users to corrupt secure-world heap metadata via an out-of-bounds write with an undersized stack size parameter. To remediate this issue, users should upgrade to version 11.3.1 or later.

Scores

CVSS	Score	Vector	Source
4.0	8.3 High	CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:H/SC:N/SI:H/SA:H	AMZN
3.1	7.3 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H	AMZN

Weaknesses

CWE-787 Out-of-bounds write

Affected Products

Product	Versions
FreeRTOS-KernelFreeRTOS	10.2.0 through 11.3.0Affected

References

https://aws.amazon.com/security/security-bulletins/2026-086-aws/vendor-advisory
https://github.com/FreeRTOS/FreeRTOS-Kernel/releases/tag/V11.3.1patch
https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-vq2f-9qj3-jj2mthird-party-advisory

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