CVE-2025-26421
📋 TL;DR
This CVE describes a lock screen bypass vulnerability in Android that allows local privilege escalation without user interaction. Attackers with physical access to a locked device could potentially bypass authentication mechanisms to access sensitive data or functionality. This affects Android devices with vulnerable versions of the lock screen implementation.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
An attacker with physical access could bypass the lock screen entirely, gaining unauthorized access to all device data, applications, and functionality as if they were the legitimate user.
Likely Case
Local attacker bypasses lock screen to access sensitive applications, personal data, or perform unauthorized actions on the device.
If Mitigated
With proper physical security controls and device encryption enabled, impact is limited to temporary unauthorized access without ability to decrypt protected data.
🎯 Exploit Status
Requires physical access to device and knowledge of specific bypass technique. No authentication required once physical access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Android Security Patch Level May 2025 or later
Vendor Advisory: https://source.android.com/security/bulletin/2025-05-01
Restart Required: No
Instructions:
1. Check for system updates in Settings > System > System update. 2. Install the May 2025 Android security patch. 3. Verify patch installation in Settings > About phone > Android security patch level.
🔧 Temporary Workarounds
Enable device encryption
allFull device encryption protects data even if lock screen is bypassed
Implement physical security controls
allEnsure devices are never left unattended in unsecured locations
🧯 If You Can't Patch
- Enable full device encryption if not already enabled
- Implement strict physical security policies for device storage and handling
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android security patch level. If before May 2025, device is likely vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify Android security patch level shows May 2025 or later in Settings > About phone > Android security patch level.📡 Detection & Monitoring
Log Indicators:
- Multiple rapid lock/unlock events
- Unusual authentication bypass patterns in system logs
Network Indicators:
- None - this is a local physical access vulnerability
SIEM Query:
Device logs showing lock screen bypass patterns or multiple authentication failures followed by successful access