Is CVE-2026-108952 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-108952?

CVE-2026-108952 has a CVSS v3 severity of MEDIUM (4.6).

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CVE-2026-108952

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.