Apple today released macOS Big Sur 11.2.1 to the public. The update, the third update to Apple’s latest macOS operating system that launched in November, comes a little more than a week after the release of macOS 11.2.
The macOS Big Sur 11.2.1 update is free and can be downloaded on all compatible Macs using the Software Update section of System Preferences.
The macOS Big Sur 11.2.1 release notes are as follows:
macOS Big Sur 11.2.1 addresses an issue that may prevent the battery from charging in some 2016 and 2017 MacBook Pro models.
Some features may not be available for all regions, or on all Apple devices.
For more detailed information about this update, please visit: https://support.apple.com/kb/HT211896
For detailed information about the security content of this update, please visit: https://support.apple.com/kb/HT201222
In addition to a fix for battery charging issues on the affected MacBook Pro models, the update also fixes a sudo security vulnerability that could allow an attacker to gain root access to a Mac.
According to an Apple security support document, the bug, CVE-2021-3156, was addressed in the update by updating to sudo version 1.9.5p2. The bug is also fixed in Supplemental Updates made available for macOS Catalina 10.15.7 and macOS Mojave 10.14.6.
The updates also include fixes for two bugs that could allow an app to execute arbitrary code with kernel privileges.