Almost every processor designed since 1995 is affected by “Speculative Execution Side-Channel Attacks” as per the extensive research was done by the researchers of Google Project Zero. The vulnerabilities have been segregated into two categories viz. Meltdown and Spectre.
Computers, smartphones, tablets etc. with Windows, Linux, iOS, MacOS, tvOS, Android or any other operating systems are impacted by these vulnerabilities. Advisory issued by Microsoft can be accessed here, furthermore, users should enable Automatic updates. However, it yet unknown how smartphone device manufactures would be pushing the updates considering for a fact that every vulnerability addressed by Android takes a long time to be made available to the end-users by the device manufacturers. Apple/iOS traditionally have always been very quick in addressing the concerns and have been providing patches to its users at a much faster rate and this time around too, we expect Apple to provide a resolution for these issues.
Apple has issued a statement pertaining to Meltdown / Spectre and iOS / Mac users should expect updates to the Safari Browser in next few days.