Apple

Apple is urging iPhone and iPad users to update their devices to fix security flaws that might have been “actively exploited” by hackers.

Apple made the software upgrades available last Tuesday, adding a rare note suggesting it was a serious threat.

The company credited anonymous researchers for pointing out the vulnerability but provided little details about the nature of the threat.

The company said one of the vulnerabilities affects the “kernel,” the nerve center of Apple’s operating system, iOS. Two others affect WebKit, the web browser engine used by Safari and other apps.

The upgrade is for several generations of devices, starting with the iPhone 6.

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