But it lifted shares of Chevron Corp CVX.N, Exxon Mobil Corp XOM.N and APA Corp APA.O between 1.2% and 3% in premarket trading. By Shreyashi Sanyal Oct 11 (Reuters) - U.S. stock index futures slipped on Monday as surging commodity prices added to inflation worries, which could cloud the earnings season set to start with Wall Street banks later this week. Rising raw material costs, labor shortages and other supply chain bottlenecks have raised concerns of elevated prices denting corporate profit.