Vulnerability in Rt-Thread
CVE-2026-108952
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.
Published .
CVSS v3 metric
CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/RT-Thread/rt-thread/issues/11739 (issue-tracking)
- github.com/RT-Thread/rt-thread/pull/11770 (issue-tracking, patch)
- github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50 (patch)
- github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/co… (technical-description)
- github.com/RT-Thread/rt-thread (product)
- www.vulncheck.com/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-108952?
- CVE-2026-108952 is a medium-severity vulnerability in Rt-Thread, classified under Access of Resource Using Incompatible Type (Type Confusion). CVSS score: 4.6/10. Published 2026-10-12.
- How severe is CVE-2026-108952?
- Medium severity. CVSS v3 base score is 4.6 out of 10.