CVE-2026-77236

high

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.

References

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

https://github.com/FreeRTOS/FreeRTOS-Kernel/security/advisories/GHSA-vq2f-9qj3-jj2m

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

Details

Source: Mitre, NVD

Published: 2026-08-21

Updated: 2026-08-21

Risk Information

CVSS v2

Base Score: 5.2

Vector: CVSS2#AV:L/AC:L/Au:S/C:N/I:P/A:C

Severity: Medium

CVSS v3

Base Score: 7.3

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:H

Severity: High

CVSS v4

Base Score: 8.3

Vector: 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

Severity: High

EPSS

EPSS: 0.00107