CVE-2026-108952

MEDIUM 4.6

RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver

CVSS Score

4.6

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-843
Vendor	rt-thread
Product	rt-thread
Published	Oct 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Physical

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

RT-Thread / rt-thread

0 ≤ 5.3.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/RT-Thread/rt-thread/issues/11739 github.com: https://github.com/RT-Thread/rt-thread/pull/11770 github.com: https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50 github.com: https://github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518 github.com: https://github.com/RT-Thread/rt-thread vulncheck.com: https://www.vulncheck.com/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-cdc-vcom-driver

Credits

Jaeyeong Lee Ijae Kim Myeonghun Pak Yuho Choi Taegyu Kim