: Fixed an issue where the play count or last played date might not update in the library.
: Apple stated they were aware of reports that this issue may have been actively exploited in the wild.
: This was a "surprise" security patch released just five days after version 11.5.
: Available for all Macs compatible with Big Sur, including MacBook (2015+), MacBook Air (2013+), and iMac (2014+).
: An application could potentially execute arbitrary code with kernel privileges.
: This security fix was released simultaneously with iOS 14.7.1 and iPadOS 14.7.1 to address the same vulnerability. macOS 11.5.1 - Apple Wiki | Fandom
While 11.5.1 was security-focused, it carries over the bug fixes introduced in 11.5 (20G71), including:
