While not entirely impossible, and it may have happened a time or two, it would be extremely unusual for a graduate degree to be rescinded for an activity that happened in undergraduate years. The person would have passed a lot of milestones since then.
A lot of undergraduate misbehavior is handled within the institution and sanctions applied, but almost always the details are kept private to the institution, even when known. And academic misconduct, rather than actual serious crimes, are typically handled as an internal matter.
I doubt that the scenario you describe would be treated as serious enough, if discovered much later, to even rescind the bachelor's degree.
Occasionally, a degree will be rescinded later when the person commits some serious crime (pedophilia) or the actual process of obtaining that degree is questioned (plagiarism). The former case is due to the fact that the association between the institution and the individual reflects badly on the institution. The latter situation is because the degree was obtained fraudulently.
But both of those are pretty rare. Honorary degrees, as opposed to earned degrees, are probably the more common situation, when the individual "honored" commits some public deed generally considered horrendous. Think Jeffrey Epstein, though I don't know if he is an example.
