The International Monetary Fund (IMF) cut its outlook for global growth in 2015 and warned about the risks of rising geopolitical tensions and a financial-market correction as stocks reach "frothy" levels.

The world economy will grow 3.8 percent next year, compared with a July forecast for 4 percent, after a 3.3 percent expansion this year, the Washington-based IMF said. U.S. growth is helping lead a worldwide acceleration that's weaker than the fund predicted two and a half months ago, as the outlooks for the euro area, Brazil, Russia, and Japan deteriorate.

"In advanced economies, the legacies of the pre-crisis boom and the subsequent crisis, including high private and public debt, still cast a shadow on the recovery," the IMF said in its latest World Economic Outlook. "Emerging markets are adjusting to rates of economic growth lower than those reached in the pre-crisis boom and the post-crisis recovery."