A new vulnerability found in the bootrom of iPhones ranging from the iPhone 4S to the iPhone 8, 8 Plus, and X may pave a new path for a permanent jailbreak method. While no jailbreak method that exploits the vulnerability yet exists, the iPhone hacking community has hailed the discovery as a rebirth of the jailbreak.
https://www.notebookcheck.net/New-exploit-dubbed-checkm8-might-lead-to-permanent-jailbreak-for-multiple-iPhone-models.435681.0.html