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

Fatal error: Uncaught Error: Call to a member function id() on array in /usr/home/filo/domains/ Stack trace: #0 /usr/home/filo/domains/ CrayonFormatter::format_code('', Array, Object(CrayonHighlighter)) #1 [internal function]: CrayonFormatter::delim_to_internal(Array) #2 /usr/home/filo/domains/ preg_replace_callback('#()#msi', 'CrayonFormatter...', 'bootargs=earlyp...') #3 /usr/home/filo/domains/ CrayonFormatter::format_mixed_code('bootargs=earlyp...', Object(CrayonLang), Object(CrayonHighlighter)) #4 /usr/home/filo/domains/ CrayonHighlight in /usr/home/filo/domains/ on line 36