Apple has released security updates to mitigate the effects of the Spectre vulnerability that affects processors deployed with Apple devices such as smartphones, tablets, and desktop computers. The patches mitigate two security bugs collectively referred to as Spectre. The company previously patched the Meltdown flaw (CVE-2017-5753) in December 2017 with the release of iOS 11.2.2, and Safari 11.0.2. Google disclosed the existence of these CPU flaws last week and Apple promised to release updates this week.
Source: https://www.bleepingcomputer.com/news/apple/apple-releases-security-updates-for-spectre-cpu-flaw/