Does cPython use multiple cores for built-in functions such as sort, any, all?

Question

I understand that cPython has a GIL so that your script can't run on multiple cores without using the multiprocessing module. But is there anything to stop the built in functions such as sorting using multiple cores? I don't understand cPython structure but I think the question I'm asking is 'are builtin functions like sort, any and list comprehensions actually below the GIL?