CVE-2026-108952
RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver
- State
- Published
- Severity
- 5.1 Medium
- Published
- Oct 12, 2026
- Updated
- Oct 13, 2026
- Reserved
- Oct 11, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 5.1 Medium | CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 4.6 Medium | CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | VulnCheck |
Weaknesses
- CWE-843 Access of Resource Using Incompatible Type ('Type Confusion')
Affected Products
| Product | Versions |
|---|---|
rt-threadRT-Thread |
|
References
- https://github.com/RT-Thread/rt-thread/issues/11739issue-tracking
- https://github.com/RT-Thread/rt-thread/pull/11770issue-trackingpatch
- https://github.com/RT-Thread/rt-thread/commit/ceef6e0ccd646aef61b907aeb9f29269d1caba50patch
- https://github.com/RT-Thread/rt-thread/blob/99428a1e7f7447955aa860f7c969273a12095b8f/components/legacy/usb/usbdevice/class/cdc_vcom.c#L518technical-description
- https://github.com/RT-Thread/rt-threadproduct
- VulnCheck Advisory: RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driverthird-party-advisory
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