Abstract In this work, we consider a generalized quantum fractional Sturm–Liouville–Langevin difference problem with terminal boundary conditions. The relevant results rely on Mönch’s fixed point theorem along theoretical method by terms of Kuratowski measure noncompactness (MNC) and the Banach contraction principle (BCP). Furthermore, two dynamical notions Ulam–Hyers (UH) (GUH) stability are a...