Hmm, nothing looks odd enough to do that, except maybe the updated kernel... If I were you, I would copy ifcfg-eth0.bak to ifcfg-eth0. I think you would be safe to do so. Make sure to update that brand new ifcfg-eth0 file just incase....
And lastly, could you pastebin ifcfg-eth0 and ifcfg-eth0.bak?