Medium 4.6Published Oct 12, 2026

CVE-2026-108952RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver

Updated under an hour ago (Oct 27, 2026, 4:30 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 4.6 MEDIUM (v3.1, CNA)CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-843
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Oct 13, 2026
First seen by InfoSec Signals: Oct 12, 2026

Affected products

Affected products

RT-Thread rt-thread rt_thread:rt_thread (from the name)	through 5.3.0	CNA record

References

References

https://github.com/RT-Thread/rt-thread/issues/11739	issue-tracking
https://github.com/RT-Thread/rt-thread/pull/11770	issue-tracking, patch
https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50	patch
https://github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518	technical-description
https://github.com/RT-Thread/rt-thread	product
https://www.vulncheck.com/advisories/rt-thread-through-5.3.0-memory-corruption-via-usb-cdc-vcom-driver	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.