Veteran investor Howard Marks said he doesn't see a widespread problem brewing in private credit, but warned that the sector's rapid expansion over the past 15 years could expose weaker lenders when markets eventually turn. "There's not a systemic problem with private credit," Marks, co-chairman and co-founder of Oaktree Capital, said Thursday on CNBC's " Money Movers ." The noted investor said that the risk stems from the pace of expansion in direct lending, which has ballooned to a market now