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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

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.

FreeRTOS Kernel是FreeRTOS公司的一款提供任务调度与资源管理的操作系统内核。 FreeRTOS Kernel 11.3.1之前版本存在缓冲区错误漏洞，该漏洞源于安全上下文分配中缺少最小大小验证，可能导致本地用户通过过小的堆栈大小参数进行越界写入，从而破坏安全世界堆元数据。

CVSS 7.3 · High EPSS 0.16% · P5

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRTOS FreeRTOS-Kernel 10.2.0≤ 11.3.0 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-77236

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

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
Vulnerability Title
FreeRTOS Kernel 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
FreeRTOS Kernel是FreeRTOS公司的一款提供任务调度与资源管理的操作系统内核。 FreeRTOS Kernel 11.3.1之前版本存在缓冲区错误漏洞，该漏洞源于安全上下文分配中缺少最小大小验证，可能导致本地用户通过过小的堆栈大小参数进行越界写入，从而破坏安全世界堆元数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

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
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10953 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
100+ AI POC generations per month

III. Intelligence Information for CVE-2026-77236

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-77236 (2)

Vendor Pages for CVE-2026-77236 (1)

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

No comments yet

Leave a comment