In OpRecordAudioMonitor::onFirstRef of AudioRecordClient.cpp, there is a possible way to record audio from the background due to a missing flag. This could lead to local escalation of privilege with User execution privileges needed. User interaction is not needed for exploitation.
https://source.android.com/security/bulletin/2023-12-01
https://android.googlesource.com/platform/frameworks/base/+/b0f6558fb36eb76df35c516ec5a65030a34a8734
https://android.googlesource.com/platform/frameworks/av/+/5f401fc9f214789d691798620fea60015962370a
https://android.googlesource.com/platform/frameworks/av/+/148aeea373febc959c429f2cabd8323508c38ad8