Memory Corruption Vulnerability in RT-Thread USB CDC Virtual COM Port Driver
CVE-2026-108952

5.1MEDIUM

Key Information:

Vendor

Rt-thread

Status
Rt-thread
Vendor
CVE Published:
12 October 2026

What is CVE-2026-108952?

A memory corruption vulnerability exists in the RT-Thread through version 5.3.0 due to improper handling in the legacy USB CDC virtual COM port driver. This flaw allows a connected USB host to trigger writes beyond the allocated ring buffer, resulting in corruption of struct vcom members. When the connection is closed with an invalid rt_free() operation, it can cause a denial of service, impacting the performance and availability of the RT-Thread system.

Affected Version(s)

rt-thread 0 <= 5.3.0

References

https://github.com/RT-Thread/rt-thread/issues/11739
issue-tracking
https://github.com/RT-Thread/rt-thread/pull/11770
issue-trackingpatch
https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd6...
patch

CVSS V4

Score:
5.1
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Physical
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jaeyeong Lee
Ijae Kim
Myeonghun Pak
Yuho Choi
Taegyu Kim
.