Answer in brief
CVE-2026-108952 records a Medium severity (CVSS 5.1) vulnerability in RT-Thread through 5.3.0 Memory Corruption via USB CDC VCOM Driver. The current sources do not mark it as known exploited. The current feed maps RT-Thread/rt-thread (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps RT-Thread/rt-thread (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| RT-Thread/rt-threadgeneric | >=0 <=5.3.0 | Not reported |
Published upstream
Oct 12, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 12, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 12, 2026
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.
Quoted source text, attributed separately from HOL analysis.