What to put on my CV while I'm waiting to hear thesis committee's decision?
List your dates as each type of student, with PhD student as your current position. For the MSc, I would put the date you submitted your thesis, so it's clear that you have finished doing the work, and something like 'awaiting outcome' to say that you haven't been awarded the MSc yet.

Having said that, I'm curious why you need a CV right now at all. The main thing is that you should not imply that you have the MSc already, particularly if that's likely to influence whether you get whatever you're applying for.