CVE-2025-20787
📋 TL;DR
This CVE describes a use-after-free memory corruption vulnerability in display components that could allow local privilege escalation. Attackers who already have System privilege could exploit this to gain higher privileges without user interaction. The vulnerability affects MediaTek devices with specific display drivers.
💻 Affected Systems
- MediaTek display drivers/components
📦 What is this software?
Android by Google
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root/kernel-level access, allowing attackers to install persistent malware, steal sensitive data, or disable security controls.
Likely Case
Local privilege escalation from System to higher kernel privileges, enabling attackers to bypass application sandboxes and access protected system resources.
If Mitigated
Limited impact if proper privilege separation and SELinux/app sandboxing are enforced, potentially containing the escalation within restricted contexts.
🎯 Exploit Status
Requires existing System privilege, making exploitation dependent on first gaining initial access through other means.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Refer to MediaTek patch ID ALPS10149879
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/January-2026
Restart Required: Yes
Instructions:
1. Check device chipset and firmware version. 2. Contact device manufacturer for updated firmware containing MediaTek patch ALPS10149879. 3. Apply firmware update following manufacturer instructions. 4. Reboot device after update.
🔧 Temporary Workarounds
Restrict System Privilege Access
linuxLimit which applications/services can obtain System privilege through SELinux policies and application sandboxing
# Review and tighten SELinux policies
# audit2allow -M mypolicy audit.log
# semodule -i mypolicy.pp
🧯 If You Can't Patch
- Implement strict application sandboxing to limit what System-privileged processes can access
- Deploy runtime memory protection solutions like ASLR, stack canaries, and control flow integrity where supported
🔍 How to Verify
Check if Vulnerable:
Check device chipset information and firmware version against MediaTek's affected list. Use: cat /proc/cpuinfo | grep -i mediatek && getprop ro.build.fingerprintCheck Version:
getprop ro.build.display.id && getprop ro.mediatek.version.releaseVerify Fix Applied:
Verify firmware version has been updated and check patch status via manufacturer update logs. Look for patch ID ALPS10149879 in update documentation.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs related to display drivers
- SELinux denials for display service privilege escalation
- Abnormal process spawning from display-related services
Network Indicators:
- Not applicable - local exploit only
SIEM Query:
source="kernel" AND ("use-after-free" OR "display" AND "panic" OR "oops") OR source="selinux" AND "avc: denied" AND "display"