systemui/statusbar/phone/QuickStatusBarHeader.java in the System UI Tuner in Android 7.0 before 2016-09-01 does not prevent tuner changes on the lockscreen, which allows physically proximate attackers to gain privileges by modifying a setting, aka internal bug 30107438.

References

• https://nvd.nist.gov/vuln/detail/CVE-2016-3886
• https://android.googlesource.com/platform/frameworks/base/+/6ca6cd5a50311d58a1b7bf8fbef3f9aa29eadcd5
• http://source.android.com/security/bulletin/2016-09-01.html
• http://www.securityfocus.com/bid/92860
• http://www.securitytracker.com/id/1036763