Can one's professional degree (e.g. Masters, PhD, MD) be revoked on the basis of an academic offence committed during their undergraduate studies?
If the offense committed as an undergraduate was severe enough as to cause the undergraduate degree to be revoked, then it is possible to affect graduate enrollment under the guise of "fraudulent admission." (You shouldn't have been admitted because you knew you had committed an offense which would make you inadmissible, and therefore you are ineligible to enroll in the graduate program.)