Is there any?
No, there is no passing mark for the CFA. As long as you fill out the exam sheet, you’re good to go. Just kidding. There have been literally tons of posts on this very subject. I would encourage you to do a search for the existing discussions on the exam grading. Don’t expect to get a definitive answer, though. This question is probably a bigger unknown than “what’s the meaning of life”. Good luck.
Note: UTILIZE THE SEARCH FUNCTION!