A temporary exemption for Fannie Mae and Freddie Mac mortgages is among the plethora of provisions contained within the Consumer Financial Protection Bureau’s long-awaited “qualified mortgage” rule issued last week. Even so, credit unions fear onerous GSE buyback requirements may be an unintended consequence of the new rule.Called for by the Dodd-Frank Act, the CFPB’s QM rule lists the characteristics of a qualified mortgage, or one that regulators will presume will be within a borrower’s ability to repay the loan.