Infinity Ward isn't taking your hacking shenanigans in Modern Warfare 3 lightly, and creative strategist Robert Bowling confirmed that the company is issuing 5,000-day bans--or permabans, really--to those who do "something bad."
And that "something bad" includes: Boosting, cheating, hacking, exploiting, inappropriate behavior (racial slurs, abusive language, etc.) or anything else that can be reported in-game, Bowling explained.
Those who know they are doing any one of the actions mentioned best cut it out immediately. That is, if you want to continue playing Modern Warfare 3 into next year.