Differential signals passing within 6 mils of ground vias?
It's generally frowned upon to break rules like that.  By "frowned upon" I mean you really need to have hyperlynx or a similar simulator to see what the effects are.  If this is part of a bus then I would be worried about the imbalance of this pair being earlier or later than the others on the bus.  If you are running some async diff pair at that speed then you will likely be in better shape.