Kateb was born in Ivry-sur-Seine, France, to an Algerian actor, Malek-Eddine Kateb, and a French nurse of Czech and Italian origin.[1] He is a grandnephew of the Algerian writer Kateb Yacine. He grew up in Ivry-sur-Seine, in the Paris region, where he lived until 2011 before moving to Montreuil.
In June 2024, Katab signed a petition addressed to French President Emmanuel Macron demanding France to officially recognize the State of Palestine.[3]