In enforceDumpPermissionForPackage of ActivityManagerService.java, there is a possible way to determine if a package is installed due to side channel information disclosure. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation. Product: Android; Versions: Android-11; Android ID: A-166667403.
https://source.android.com/security/bulletin/2021-01-01
https://source.android.com/security/bulletin/2021-01-01
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-0321