Medium severity4.6NVD Advisory· Published Oct 12, 2026
CVE-2026-108952
CVE-2026-108952
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.
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Affected products
1Patches
Vulnerability mechanics
References
5- github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.cnvd
- github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50nvd
- github.com/RT-Thread/rt-thread/issues/11739nvd
- github.com/RT-Thread/rt-thread/pull/11770nvd
- www.vulncheck.com/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-cdc-vcom-drivernvd
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