Google’s Project Zero team, established two years ago as a task-force against zero day exploits, identified a coding exploit in the underlying kernel of Apple’s OSX and it’s mobile operating system iOS, which could allow for root-level escalation of privileges for an attacker in a non-updated version of the OS.
The exploit was reported to Apple in June by PZ member Ian Beer, after which Apple requested a 60-day period of grace to address the problem before it went public. Google initially refused the request, but eventually agreed a deadline of September 21st to disclose the exploit.
However, the fix that Apple created for the problem directly prior to disclosure was unsuccessful, and that deadline was allowed to pass. In effect Apple got nearly five months to address the issue – which it has now done, with this week’s release of OSX 10.12.1 and last week’s release of iOS 10.1, which also featured a remedy for the kernel vulnerability.