CVE-2025-48594
📋 TL;DR
This vulnerability allows a malicious companion application to retain elevated privileges after being disassociated from a device, enabling local privilege escalation. It affects Android devices where companion apps can be installed. User interaction is required for exploitation.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
An attacker gains persistent elevated privileges on the device, potentially accessing sensitive data or performing unauthorized actions with system-level permissions.
Likely Case
A malicious companion app maintains privileges it should have lost after disassociation, allowing continued access to restricted functionality.
If Mitigated
With proper Android security updates, the vulnerability is patched and companion apps properly lose privileges upon disassociation.
🎯 Exploit Status
Requires user to install and interact with a malicious companion application, then trigger disassociation while the app retains privileges.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android December 2025 security update
Vendor Advisory: https://source.android.com/security/bulletin/2025-12-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > System update. 2. Install the December 2025 security update. 3. Restart the device after installation.
🔧 Temporary Workarounds
Disable companion app functionality
androidPrevent installation or use of companion applications on vulnerable devices
Restrict app installation sources
androidOnly allow app installations from trusted sources like Google Play Store
Settings > Security > Install unknown apps > Disable for all sources
🧯 If You Can't Patch
- Monitor for suspicious companion app behavior and review app permissions regularly
- Implement mobile device management (MDM) policies to control app installation and permissions
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android version > Security patch level. If before December 2025, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows 'December 1, 2025' or later in Settings > About phone > Android version.📡 Detection & Monitoring
Log Indicators:
- Unusual privilege retention by companion apps after disassociation events
- Companion app processes maintaining elevated permissions
Network Indicators:
- Companion apps communicating after being disassociated
SIEM Query:
Processes with companion app permissions AND disassociation events without permission revocation