zIVA is a kernel exploit that affects iOS 10.3.1 and previous versions. It allows an attacker to gain arbitrary RW (Read Write) and root access. Apple has addressed the eight vulnerabilities in a security patch it released in May. Zimperium researcher Adam Donenfeld is set to give a talk on the vulnerabilities tomorrow at the Hack In The Box – Singapore security conference. He said he “tried to investigate an area of the kernel that wasn t thoroughly researched before”””
Source: https://www.bleepingcomputer.com/news/security/researcher-releases-fully-working-exploit-code-for-ios-kernel-vulnerability/