By Samanda Dorger Prices in these 25 cities rose 10% in a year, the highest increase since 2007. Four U.S. cities are among the top five with the fastest-rising prices. Most people remember when the housing bubble burst in the U.S., leading to the financial crisis of 2007-2008. Bubbles occur when prices rise beyond a sustainable level, and they are a recurring phenomenon in real estate markets. But real estate prices pretty much always go up, and the existence of a bubble can’t really be proven until it bursts. One can only attempt to recognize the risk. A new 2022 annual report by global fina…