I haven't dug too deeply into this, but a defamation claim under state law would probably be pre-empted by the Fair Credit Reporting Act. You mostly can't sue them unless you can prove they defamed you with malice or with willful intent.

https://www.law.cornell.edu/uscode/text/15/1681h

In this case, maybe you could have a shot by arguing that since the bureaus know that like half the population's information was stolen, they are acting with reckless disregard for whether their statements are true if they don't now do additional investigation to confirm the identity of the subject of their statements in order to mitigate the effects of the breach.