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CVE-2026-77237— Missing type validation in xQueueAddToSet in FreeRTOS-Kernel

Quick assessment

Affected
FreeRTOS FreeRTOS-Kernel
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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xQueueAddToSet()函数缺少队列集类型验证，可能导致MPU启用端口上configUSE_QUEUE_SETS=1配置下的无特权任务读取特权内核内存。

CVSS 6.5 · Medium EPSS 0.18% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
FreeRTOS FreeRTOS-Kernel 7.4.0≤ 11.3.0 affected
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I. Basic Information for CVE-2026-77237

Vulnerability Information
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Vulnerability Title
Missing type validation in xQueueAddToSet in FreeRTOS-Kernel
Source: CVE Program / CVE List V5
Vulnerability Description
Missing queue-set type validation in xQueueAddToSet() in the FreeRTOS-Kernel before 11.3.1 might allow an unprivileged task on MPU-enabled ports with configUSE_QUEUE_SETS=1 to read privileged kernel memory. 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:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用不兼容类型访问资源(类型混淆)
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xQueueAddToSet()函数缺少队列集类型验证，可能导致MPU启用端口上configUSE_QUEUE_SETS=1配置下的无特权任务读取特权内核内存。
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 7.4.0 ~ 11.3.0 -

II. Public POCs for CVE-2026-77237

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III. Intelligence Information for CVE-2026-77237

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Vendor Advisories for CVE-2026-77237 (2)

Vendor Pages for CVE-2026-77237 (1)

Other References for CVE-2026-77237 (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-2026-77235 7.3 HIGH Missing privilege check in SecureContext_FreeContext in FreeRTOS-Kernel

IV. Related Vulnerabilities

Same product: FreeRTOS-Kernel
Same vendor: FreeRTOS
Same weakness: CWE-843

V. Comments for CVE-2026-77237

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