From: Apple Product Security
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APPLE-SA-2016-01-19-1 iOS 9.2.1

iOS 9.2.1 is now available and addresses the following:

Disk Images
Available for:  iPhone 4s and later,
iPod touch (5th generation) and later, iPad 2 and later
Impact:  A local user may be able to execute arbitrary code with
kernel privileges [...]