CVE-2025-20779
📋 TL;DR
CVE-2025-20779 is a use-after-free vulnerability in display drivers caused by a race condition. This allows local attackers with System privilege to escalate privileges without user interaction. The vulnerability affects MediaTek devices using specific display components.
💻 Affected Systems
- MediaTek display components/drivers
📦 What is this software?
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root-level access, allowing installation of persistent malware, data theft, and disabling of security controls.
Likely Case
Local privilege escalation enabling attackers to bypass application sandboxes, access sensitive system resources, and maintain persistence.
If Mitigated
Limited impact if proper privilege separation and SELinux/app sandboxing are enforced, though kernel-level access remains possible.
🎯 Exploit Status
Race condition exploitation requires precise timing; System privilege prerequisite reduces attack surface.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to patch ID ALPS10184084 in vendor updates
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/January-2026
Restart Required: Yes
Instructions:
1. Check device manufacturer for security updates. 2. Apply firmware/OS updates containing patch ALPS10184084. 3. Reboot device after patching.
🔧 Temporary Workarounds
Restrict System Privilege Access
androidLimit applications and users with System privilege to reduce attack surface
Review and audit applications with android:sharedUserId="android.uid.system" in manifest
🧯 If You Can't Patch
- Implement strict SELinux policies to contain potential privilege escalation
- Monitor for unusual process behavior from System-privileged applications
🔍 How to Verify
Check if Vulnerable:
Check device firmware version against vendor patch notes; examine if patch ALPS10184084 is appliedCheck Version:
adb shell getprop ro.build.display.id (for Android devices)Verify Fix Applied:
Verify firmware version includes January 2026 or later security updates from device manufacturer📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs related to display drivers
- Unusual process privilege escalation from System UID
Network Indicators:
- None - local exploitation only
SIEM Query:
Process creation where parent process has System UID and child process gains elevated privileges