CVE-2025-20796
📋 TL;DR
This vulnerability in imgsys allows an attacker with System privilege to perform an out-of-bounds write through improper input validation, potentially leading to local privilege escalation. Exploitation requires user interaction and affects MediaTek devices using the vulnerable imgsys component. The vulnerability enables attackers to gain higher privileges on already compromised systems.
💻 Affected Systems
- MediaTek devices with imgsys component
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root/kernel-level access, allowing persistent backdoors, data theft, and disabling of security controls.
Likely Case
Local privilege escalation from System to higher privileges, enabling installation of malware, credential harvesting, and lateral movement within the network.
If Mitigated
Limited impact due to proper privilege separation and minimal user interaction requirements, with potential for detection through monitoring.
🎯 Exploit Status
Requires System privilege and user interaction; out-of-bounds write vulnerabilities can be complex to exploit reliably.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patch ID: ALPS10314745
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/January-2026
Restart Required: Yes
Instructions:
1. Check device manufacturer for firmware updates. 2. Apply MediaTek patch ALPS10314745. 3. Reboot device after patch installation. 4. Verify patch application through version checks.
🔧 Temporary Workarounds
Restrict System Privilege Access
androidLimit which applications and users have System privilege to reduce attack surface
Review and modify SELinux/AppArmor policies
Audit applications with System privilege
User Education
allEducate users about risks of installing untrusted applications or clicking suspicious links
🧯 If You Can't Patch
- Implement strict application whitelisting to prevent malicious apps from obtaining System privilege
- Deploy endpoint detection and response (EDR) solutions to monitor for privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check device firmware version and compare against patched versions from manufacturer; look for imgsys component versionCheck Version:
adb shell getprop ro.build.fingerprint (for Android devices)Verify Fix Applied:
Verify patch ALPS10314745 is applied through device firmware version or security patch level📡 Detection & Monitoring
Log Indicators:
- Unusual privilege escalation attempts
- imgsys process crashes or abnormal behavior
- SELinux/AppArmor denials related to imgsys
Network Indicators:
- Not applicable - local exploitation only
SIEM Query:
process_name:"imgsys" AND (event_type:"privilege_escalation" OR event_type:"crash")