Saif Ali Khan had a spinal fluid leak after knife attack: Is it dangerous?

Doctors at Lilavati Hospital said that Saif Ali Khan was stabbed six times and that he was leaking spinal fluid. He has since undergone surgery to remove the knife and repair the leak. But what is Cerebrospinal fluid? Why is it important?

Saif Ali Khan had a spinal fluid leak after knife attack: Is it dangerous?
Doctors at Lilavati Hospital said that Saif Ali Khan was stabbed six times and that he was leaking spinal fluid. He has since undergone surgery to remove the knife and repair the leak. But what is Cerebrospinal fluid? Why is it important?