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CVE-2026-108952— RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver

Quick assessment

Affected
RT-Thread rt-thread
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.

RT-Thread 5.3.0 及以下版本中存在一个内存损坏漏洞，位于遗留的 USB CDC 虚拟串口驱动中。在 函数中， 被错误地别名为 Serial V2 的 。当连接的 USB 主机对 CDC 设备进行配置时，会触发向环形缓冲区之后写入数据，从而覆盖 结构体的成员，并在关闭连接时引发非法的 调用，最终导致服务拒绝（Denial of Service, DoS）攻击。

CVSS 4.6 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
RT-Thread rt-thread ≤ 5.3.0 affected
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I. Basic Information for CVE-2026-108952

Vulnerability Information
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Vulnerability Title
RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver
Source: CVE Program / CVE List V5
Vulnerability Description
RT-Thread through 5.3.0 contains a memory corruption vulnerability in the legacy USB CDC virtual COM port driver that aliases rx_ringbuffer as a Serial V2 rt_serial_rx_fifo in _function_enable(). A connected USB host configuring the CDC device triggers writes past the ring buffer into struct vcom members and an invalid rt_free() on close, causing denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
RT-Thread rt-thread 0 ~ 5.3.0 -

II. Public POCs for CVE-2026-108952

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III. Intelligence Information for CVE-2026-108952

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Patches & Fixes for CVE-2026-108952 (2)

Vendor Advisories for CVE-2026-108952 (1)

Other References for CVE-2026-108952 (2)

IV. Related Vulnerabilities

Same product: rt-thread
Same weakness: CWE-843

V. Comments for CVE-2026-108952

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