In this work a novel stability monitoring and adaptive stabilization control scheme is proposed for DC power distribution systems. For stability analysis and stabilization, the system bus impedance is needed. Conventionally, several lengthy measurement cycles are required to obtain the bus impedance. This work, instead, proposes a method for online estimation of the bus impedance using the voltage loop-gain of the source converter and the input impedance of the load converter. In this approach, all the needed information for system stability monitoring and adaptive stabilization are obtained in a single measurement cycle by injecting a wide-band perturbation in the source converter control platform.