CVE-2025-36923
📋 TL;DR
This CVE describes a heap buffer overflow vulnerability in the NrmmDecoder component of Android's media framework. An attacker could exploit this to execute arbitrary code with elevated privileges on affected devices, potentially gaining full control. The vulnerability affects Android devices, particularly Google Pixel phones, and requires no user interaction for exploitation.
💻 Affected Systems
- Google Pixel phones
- Android devices using affected media framework
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Remote attacker gains full control of the device, installs persistent malware, accesses sensitive data, and uses the device as a pivot point in the network.
Likely Case
Attacker gains elevated privileges to install malicious apps, access device data, or use the device for further attacks within the local network.
If Mitigated
With proper network segmentation and device hardening, impact is limited to the compromised device only.
🎯 Exploit Status
No user interaction required, but exploitation requires sending specially crafted media files to the device.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: December 2025 Android security patch or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2025-12-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > System update. 2. Install the December 2025 security patch. 3. Reboot the device after installation.
🔧 Temporary Workarounds
Disable automatic media processing
androidPrevent automatic processing of media files from untrusted sources
Network segmentation
allIsolate Android devices on separate network segments to limit lateral movement
🧯 If You Can't Patch
- Segment Android devices on isolated network VLANs
- Implement strict firewall rules to limit device communication to trusted sources only
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android version. If patch level is earlier than December 2025, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows December 2025 or later in Settings > About phone > Android version.📡 Detection & Monitoring
Log Indicators:
- Crash logs from media server processes
- Unexpected privilege escalation attempts
- Suspicious media file processing
Network Indicators:
- Unusual network traffic from Android devices
- Media files being sent to devices from untrusted sources
SIEM Query:
source="android_logs" AND (process="mediaserver" OR process="media.codec") AND (event="crash" OR event="segfault")