  We explore the possibility of having a successful leptogenesis through
oscillations between new sterile fermion states added to the Standard Model
field content in a well motivated framework, naturally giving rise to the
required mass splitting between the sterile states through a small total lepton
number violation. We propose a framework with only two sterile states forming a
pseudo-Dirac state, in which their mass difference as well as the smallness of
the neutrino masses are due to two sources of lepton number violation with
$\Delta L=2$, corresponding to an Inverse Seesaw framework extended by a Linear
Seesaw mass term. We also explore the pure Inverse Seesaw mechanism in its
minimal version, requiring at least four new sterile states in order to comply
with neutrino data. Our analytical and numerical studies reveal that one can
have a successful leptogenesis at the temperature of the electroweak scale
through oscillations between the two sterile states with a "natural" origin of
the strong degeneracy in their mass spectrum. We also revisit the analytical
expression of the baryon asymmetry of the Universe in the weak washout regime
of this framework.
