The lock was banned for three weeks after being found guilty of dangerous play.
The committee found that the 33-year-old had acted recklessly when leading with an elbow that caught the head of an opponent.
There was a high degree of danger that led the committee to rule against Gray.
Gray won't be able to play for Glasgow.
The 3 December date with Zebre is in the Rugby Championship.
Scotland's assistant coach said there was no malicious intent.
The entry point for such an offence was reduced by three weeks because of Gray's good record.
Following news of the citing, Callum Hunter-Hill was called up to the squad, despite not having played in a game.
Gray played in Scotland's 31-23 defeat to the All Blacks after making his first start in five years against the Fijians.
His work outside set-piece as well as his leadership has been great for us. He has brought a lot to the table and it's been great to see him in such good shape.
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