Soria was born in Bahía Blanca in 1949, and was raised in a nearby rural town, General Daniel Cerri. His father, Ernesto Soria, was an outspoken Peronist, and was arrested shortly after the 1955 coup against President Juan Perón. Following his release several months later, the Sorias relocated to Bariloche. The elder Soria was again arrested amid a crackdown on Peronist protests during a state visit to Bariloche by U.S. President Dwight Eisenhower in March 1959, and was imprisoned in Bahía Blanca. He was released in April 1962 and the family settled in General Roca, Río Negro, where they opened a neighborhood store.