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CVE-2026-77234— Improper input validation in FreeRTOS-Kernel timer command handling

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之前版本存在授权问题漏洞，该漏洞源于输入验证不当，可能导致支持MPU的端口上的非特权任务以特权内核上下文执行代码。

CVSS 8.8 · High EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRTOS FreeRTOS-Kernel 7.0.0≤ 11.3.0 affected
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I. Basic Information for CVE-2026-77234

Vulnerability Information
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Vulnerability Title
Improper input validation in FreeRTOS-Kernel timer command handling
Source: CVE Program / CVE List V5
Vulnerability Description
Improper input validation in FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports to execute code in privileged kernel context. 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:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
FreeRTOS Kernel 授权问题漏洞
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之前版本存在授权问题漏洞，该漏洞源于输入验证不当，可能导致支持MPU的端口上的非特权任务以特权内核上下文执行代码。
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 7.0.0 ~ 11.3.0 -

II. Public POCs for CVE-2026-77234

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 9048 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-2026-77234

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Vendor Advisories for CVE-2026-77234 (2)

Vendor Pages for CVE-2026-77234 (1)

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

CVE-2026-77236 7.3 HIGH Missing size validation in SecureContext_AllocateContext in FreeRTOS-Kernel
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-863

V. Comments for CVE-2026-77234

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