CVE-2026-108952
RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver
RT-Thread rt-thread
CVSS
5.1MediumExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 1
- rt-threadaffected: all versions through 5.3.0CVE List
References 6
- github.com/RT-Thread/rt-thread/pull/11770Fixvia CVE List
- github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50Fixvia CVE List
- vulncheck.com/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-cdc-vcom-driverAdvisoryvia CVE List
- github.com/RT-Thread/rt-thread/issues/11739Referencevia CVE List
- github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518Referencevia CVE List
- github.com/RT-Thread/rt-threadReferencevia CVE List