{"id":"CVE-2026-108952","published":"2026-10-12T13:17:28.150","lastModified":"2026-10-16T19:18:44.867","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.","cvssScore":4.6,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwes":["CWE-843"],"vendors":[],"products":[],"references":[{"url":"https://github.com/RT-Thread/rt-thread","tags":[]},{"url":"https://github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518","tags":[]},{"url":"https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50","tags":[]},{"url":"https://github.com/RT-Thread/rt-thread/issues/11739","tags":[]},{"url":"https://github.com/RT-Thread/rt-thread/pull/11770","tags":[]},{"url":"https://www.vulncheck.com/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-cdc-vcom-driver","tags":[]}],"exploitRefs":[{"url":"https://github.com/RT-Thread/rt-thread","tags":[]},{"url":"https://github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518","tags":[]},{"url":"https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50","tags":[]},{"url":"https://github.com/RT-Thread/rt-thread/issues/11739","tags":[]},{"url":"https://github.com/RT-Thread/rt-thread/pull/11770","tags":[]}],"hasPoc":true,"ai":null}