FreeRTOSKernel 11.3.0: Heap Metadata OOB via Undersized Stack
CVE-2026-77236 Published on August 21, 2026
Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel
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.
Vulnerability Analysis
CVE-2026-77236 is exploitable with local system access, and requires small amount of user privileges. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality, with no impact on integrity, and a high impact on availability.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-77236 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-77236
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Affected Versions
FreeRTOS-Kernel:- Version 10.2.0, <= 11.3.0 is affected.