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Several recently-published research articles have demonstrated a new class of attacks (dubbed "Meltdown" and "Spectre") that work on most modern computer processors. At best, the vulnerability could be leveraged by malware and hackers to more easily exploit other security bugs. At worst, the hole flaw could be abused by programs and logged-in users to read the contents of your computer's memory (such as your password).
This is a deeply technical issue that mainly requires software and operating system providers to issue software updates to fix.
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