Intel, Microsoft Deal With Widespread Computer-Chip Weakness

The world’s biggest chipmakers and software companies, including Intel Corp. and Microsoft Corp., are coming to grips with a vulnerability that leaves vast numbers of computers and smartphones susceptible to hacking and performance slowdowns.

Google researchers recently discovered that a feature, present in almost all of the billions of processors that run computers and phones around the world, could give cyberattackers unauthorized access to sensitive data -- and whose remedy could drag on device performance. News of the weakness, found last year and reported Tuesday by The Register technology blog, weighed on shares of Intel, the biggest semiconductor maker, while boosting rivals including Advanced Micro Devices Inc. Intel’s silence for most of Wednesday added to investors’ unease.