  Quantum steering is an asymmetric form of quantum nonlocality where one can
detect whether a measurement on one system can steer or change another distant
system. It is well-known that there are quantum states that are entangled but
unsteerable in the standard quantum steering scenario. Consequently, a
long-standing open problem in this regard is whether the steerability of every
entangled state can be activated in some way. In this work, we consider quantum
networks and focus on the swap-steering scenario without inputs and find linear
witnesses of network steerability corresponding to any negative partial
transpose (NPT) bipartite state and a large class of bipartite states that
violate the computable cross-norm (CCN) criterion. Furthermore, by considering
that the trusted party can perform tomography of the incoming subsystems, we
construct linear inequalities to witness swap-steerability of every bipartite
entangled state. Consequently, for every bipartite entangled state one can now
observe a form of quantum steering.
