CUPERTINO, Calif. (AP)– Apple is prompting iPhone and iPad users to update their gadgets to fix security defects that might have been “actively made use of” by hackers.Apple made the software upgrades readily available Tuesday, adding a rare note suggesting it was a severe hazard. The business credited confidential researchers for pointing out the vulnerability but supplied little information about the nature of the threat.The business stated among the vulnerabilities affects the “kernel,” the nerve center of Apples os, iOS. 2 others affect WebKit, the web browser engine utilized by Safari and other apps. The upgrade is for several generations of gadgets, beginning with the iPhone 6. Complete Coverage: Technology.