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CVE-2026-77236— Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel

Quick assessment

Affected

FreeRTOS FreeRTOS-Kernel

Exploitation

Public or AI PoC available; prioritize validation

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 FreeRTOS-Kernel 11.3.1 之前的版本中，安全上下文分配存在最小尺寸验证缺失的问题，本地用户可能通过提供一个不足大小的栈尺寸参数，导致越界写入，从而破坏安全世界的堆元数据。为修复此问题，用户应将系统升级至 11.3.1 或更高版本。

CVSS 7.3 · High EPSS 0.11% · P1 Updated Aug 22, 2026

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

Vendor	Product	Version Range	Status
FreeRTOS	FreeRTOS-Kernel	`10.2.0≤ 11.3.0`	affected

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Vulnerability Information

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Vulnerability Title

Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

跨界内存写

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
FreeRTOS	FreeRTOS-Kernel	10.2.0 ~ 11.3.0	-

II. Public POCs for CVE-2026-77236

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-77236

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Vendor Advisories for CVE-2026-77236 (2)

Vendor Pages for CVE-2026-77236 (1)

🔗 Release V11.3.1 · FreeRTOS/FreeRTOS-Kernel · GitHub patch

https://www.cve.org/CVERecord?id=CVE-2026-77236

Same Patch Batch · FreeRTOS · 2026-08-21 · 4 CVEs total

CVE-2026-77234	8.8 HIGH	Improper input validation in FreeRTOS-Kernel timer command handling
CVE-2026-77235	7.3 HIGH	Missing privilege check in SecureContext_FreeContext in FreeRTOS-Kernel
CVE-2026-77237	6.5 MEDIUM	Missing type validation in xQueueAddToSet in FreeRTOS-Kernel

IV. Related Vulnerabilities

Same product: FreeRTOS-Kernel

Same vendor: FreeRTOS

Same weakness: CWE-787

V. Comments for CVE-2026-77236

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2026-77236— Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel

Quick assessment

Possible ATT&CK Techniques 1 AI

Affected Version Matrix 1

I. Basic Information for CVE-2026-77236

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2026-77236

III. Intelligence Information for CVE-2026-77236

Vendor Advisories for CVE-2026-77236 (2)

Vendor Pages for CVE-2026-77236 (1)

Same Patch Batch · FreeRTOS · 2026-08-21 · 4 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2026-77236

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