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    CVE-2026-77236

    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.

    Published:Aug 21, 2026
    Last Modified:Aug 25, 2026
    EPS:Aug 21, 2026
    EPSS Score:0.00107
    CVSS Score:7.3

    Affected Products

    Vendor
    Amazon
    Product
    Freertos
    Vendor
    Freertos
    Product
    Freertos-kernel

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-787 Out-of-bounds Write

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-77237 (CVSS 8.2) — Missing queue-set type validation in xQueueAddToSet() in the FreeRTOS-Kernel before 11.3.1 might allow an unpr…
    CVE-2026-77235 (CVSS 8.3) — Missing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might al…
    CVE-2026-77234 (CVSS 9.3) — Improper input validation in FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled por…
    CVE-2025-5688 (CVSS 7.5) — We have identified a buffer overflow issue allowing out-of-bounds write when processing LLMNR or mDNS queries …
    CVE-2024-28115 (CVSS 8.8) — FreeRTOS is a real-time operating system for microcontrollers. FreeRTOS Kernel versions through 10.6.1 do not …
    CVE-2021-27504 (CVSS 7.4) — Texas Instruments devices running FREERTOS, malloc returns a valid pointer to a small buffer on extremely lar…
    CVE-2021-43997 (CVSS 7.8) — FreeRTOS versions 10.2.0 through 10.4.5 do not prevent non-kernel code from calling the xPortRaisePrivilege in…
    CVE-2021-32020 (CVSS 9.8) — The kernel in Amazon Web Services FreeRTOS before 10.4.3 has insufficient bounds checking during management of…
    CVE-2021-31572 (CVSS 9.8) — The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in stream_buffer.c for a stre…
    CVE-2021-31571 (CVSS 9.8) — The kernel in Amazon Web Services FreeRTOS before 10.4.3 has an integer overflow in queue.c for queue creation…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High