Warren Buffett's favorite stocks gauge is flashing red, markets guru John Hussman says

• Warren Buffett's namesake gauge is sounding the alarm on stocks, John Hussman says.
• The Buffett Indicator is "above every extreme prior to late-2020," the markets guru posted on X.
• The metric compares the total value of the US stock market to the size of the national economy.

Warren Buffett's go-to market gauge is ringing alarm bells for one of Wall Street's biggest bears.