In startAlwaysOnVpn of Vpn.java, there is a possible way to disable always-on VPN due to a logic error in the code. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
https://source.android.com/security/bulletin/2025-12-01
https://android.googlesource.com/platform/frameworks/base/+/cabbb7da639520633ad318655d1b5fe1c685c78e