Serial port redirection from Windows to Linux with socat

My work computer is a Windows machine running several virtual machines with Linux and FreeBSD via VirtualBox. A part of my work requires developing software that interacts with hardware. Most of the time I have successfully used VirtualBox USB filtering to redirect USB devices to the virtual machines, but recently I got a USB device (CDC-ACM class) that refused to be forwarded to the VM.
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Gentoo on Banana Pi

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