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CVE-2026-77235— Missing privilege check in SecureContext_FreeContext 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 版本之前，安全上下文清理处理程序中缺少特权验证。本地用户可能通过用于安全上下文释放的 SVC 处理程序，导致安全世界内存中发生 use-after-free 漏洞。 为解决此问题，建议用户升级至 11.3.1 或更高版本。

CVSS 7.3 · High EPSS 0.10% · P1

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRTOS FreeRTOS-Kernel 10.2.0≤ 11.3.0 affected
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I. Basic Information for CVE-2026-77235

Vulnerability Information
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Vulnerability Title
Missing privilege check in SecureContext_FreeContext in FreeRTOS-Kernel
Source: CVE Program / CVE List V5
Vulnerability Description
Missing privilege verification in the secure context cleanup handler in FreeRTOS-Kernel before 11.3.1 might allow local users to cause a use-after-free condition in secure-world memory via the SVC handler for secure context deallocation. 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
释放后使用
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-2026-77235

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 10017 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-77235

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Vendor Advisories for CVE-2026-77235 (2)

Vendor Pages for CVE-2026-77235 (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-2026-77236 7.3 HIGH Missing size validation in SecureContext_AllocateContext 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-416

V. Comments for CVE-2026-77235

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