CVE-2026-108952
MEDIUM
NVD
CVSS Score
4.6
Severity
MEDIUM
Published
Oct 12, 2026
Vendor
unknown
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.
References
- https://github.com/RT-Thread/rt-thread
- https://github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518
- https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50
- https://github.com/RT-Thread/rt-thread/issues/11739
- https://github.com/RT-Thread/rt-thread/pull/11770