A new vulnerability has been discovered in Webkit, the underlying engine that powers Safari on iPhone, iPad and macOS. A webpage with 15 lines of code in CSS can cause a kernel panic on an iPhone or iPad and force it to restart. Such a webpage can also cause Safari on Mac to crash, however, it will not restart macOS. Details of the security flaw and its source code were shared by Sabri (@pwnsdx on Twitter), who is a security researcher. The issue does not impact just Safari, but it effects all default and third-party apps on iOS that use WebKit,

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