From The Hollywood Reporter [1]:

Protests erupted last year after pirate copies of another film, “The Kabul Express,” which was seen as anti-Hazara, made their way into the multiethnic country that is struggling to emerge from decades of invasion and civil war.

The Afghan government, whose power does not extend much beyond the main cities, then banned the film, sending prices of pirated copies soaring.

“On the basis of the instruction of the Information and Culture Ministry, the ‘Kite Runner’ film’s depiction and import has been banned,” Latif Ahmadi, the head of state-run Afghan Film told Reuters late Monday.

“(The film has been banned) because some of its scenes are questionable and unacceptable for some people and would cause sensitiveness and would cause trouble for the government and people,” he added.