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Apple releases macOS Catalina 10.15.5 supplemental update

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Apple has released a supplemental update to macOS Catalina 10.15.5, just a week after its release. In its release notes, Apple explained that the supplemental update is a simple security update.

The release notes are as follows:

  • macOS Catalina 10.15.5 supplemental update provides important security updates and is recommended for all users.
  • Some features may not be available for all regions, or on all Apple devices. For detailed information about the security content of this update, please visit: https://support.apple.com/en-us/HT211215

The update patches a kernel exploit that allows an application to execute arbitrary code. The support article also makes a direct reference to the unc0ver exploit that has been used to jailbreak iOS devices.

Apple also released a security update for macOS High Sierra 10.13.6.

macOS Catalina 10.15.5 introduces Battery Health Management to support devices, a feature designed to improve the lifespan of a MacBook’s battery. The utility not just reports the status of a MacBook battery but also attempts to reduce the rate at which the battery ages but monitoring its temperature history and charging patterns.

This feature is similar to the iOS 13 feature which optimises battery charging, not fully charging the phone unless necessary.


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Vernon is the founder and chief editor of Vernonchan.com. A graphic designer by profession, he has a deep love for technology, cars, gadgets, food, and travel. He tweets too much and is also known as a caffeine bacterium ("life's too short for bad coffee"). Bleeds Blue (go Chelsea FC!) and considers BMW, Porsche, Alfa Romeo cars to have in the garage--for true petrolheads, that is.