As of today, there are no known exploits in the wild impacting vulnerable Intel, AMD and ARM devices. Meltdown and Spectre processor vulnerabilities were disclosed last week. Experts say two vectors that exploit Spectre will be particularly challenging to immunize s ve exploited. Spectre is much more difficult to attack to carry out because it breaks the isolation between different applications, researchers say. Microsoft, Google and Microsoft have all provided patches for Meltdown, Spectre and Meltdown flaws.
Source: https://threatpost.com/experts-weigh-in-on-spectre-patch-challenges/129337/