Md. Code Ann., Real Prop. § 2-108

A covenant by the grantor in a deed “that he has the right to grant the land” has the same effect as if the grantor had covenanted that he has good right, full power, and absolute authority to grant the land to the grantee in the deed, in the manner in which the land is granted, or intended to be, by the deed, according to its true intent.