{"id":"CVE-2026-108952","title":"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()","summary":"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 …","severity":"medium","cvss":4.6,"cvssVector":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cwe":["CWE-843"],"published":"2026-10-12","updated":"2026-10-12","sourceUpdated":"2026-10-12T13:17:28.150","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-108952","references":[{"url":"https://github.com/RT-Thread/rt-thread","label":"disclosure@vulncheck.com"},{"url":"https://github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518","label":"disclosure@vulncheck.com"},{"url":"https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50","label":"disclosure@vulncheck.com"},{"url":"https://github.com/RT-Thread/rt-thread/issues/11739","label":"disclosure@vulncheck.com"},{"url":"https://github.com/RT-Thread/rt-thread/pull/11770","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-cdc-vcom-driver","label":"disclosure@vulncheck.com"}],"tags":["nvd"],"ingestedAt":"2026-10-12T14:50:34.109Z","slug":"CVE-2026-108952","body":"## Overview\n\nRT-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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":25,"depthScoreParts":{"impact":25.3,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}