Apple is rolling out iOS 12.4.4 for older iOS devices. These are devices that are not compatible with iOS 13 but are still being updated to patch them with the latest security fixes. The list of iPhones being updated includes the iPhone 6s, the iPhone 6 and the iPhone 5s. The iPads include the iPad Air (1st generation), iPad mini 2 and iPad mini 3. Lastly, the update is also available for the iPod touch 6. The change log doesn't say much other than this being an important security update and that it is recommended for all. We suggest you take Apple's advice seriously and download...
Source: https://www.gsmarena.com/apple_releases_ios_1244_for_the_iphone_6s_6_and_5s-news-40526.php