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

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.

The mintToken function of a smart contract implementation for Thread, an Ethereum token, has an integer overflow that allows the owner of the contract to set the balance of an arbitrary user to any value.