On mid Oct 2017, researchers revealed details of a new exploit called KRACK that takes advantage of vulnerabilities in Wi-Fi security to let attackers eavesdrop on traffic between computers and wireless access points.It takes advantage of several key management vulnerabilities in the WPA2 security protocol, the popular authentication scheme used to protect personal and enterprise Wi-Fi networks.
Google has already fixed the problem for customers running supported versions of Android version 5,6,7 and 8. The formal patches has already released in 2017-11-06 security patch.
The URL is:
And these patches are listed in chapter 2017-11-06 security patch, System section.
Please all i.mx series devices that use the security patch level earlier than 2017-11-06 must include all applicable patches to fix this wifi vulnerability on Android.