  We propose a minimal model based on lepton number symmetry (and violation),
to address a common origin of baryon asymmetry, dark matter and neutrino mass
generation. The model consists of a vector like fermion to constitute the dark
sector, three right handed neutrinos (RHN) to dictate leptogenesis and neutrino
mass, while an additional complex scalar is assumed to be present in the early
universe the decay of which produces both DM and RHN via lepton number
violating and lepton number conserving interactions respectively.
Interestingly, the presence of the same scalar helps in making the electroweak
vacuum stable till the Planck scale. The unnatural largeness and smallness of
the parameters required to describe correct experimental limits are attributed
to lepton number violation. The allowed parameter space of the model is
illustrated via a numerical scan.
