CVE-2023-48421
📋 TL;DR
This vulnerability allows local attackers to write beyond allocated memory bounds in the Pixel GPU driver, potentially leading to kernel-level privilege escalation. It affects Google Pixel devices running vulnerable Android versions. No user interaction is required for exploitation.
💻 Affected Systems
- Google Pixel smartphones
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with kernel-level code execution, allowing complete device control and data access
Likely Case
Local privilege escalation to root/system privileges, enabling installation of persistent malware or data theft
If Mitigated
Limited impact if SELinux/AppArmor policies restrict the vulnerable component or if the device is fully patched
🎯 Exploit Status
Requires local access but no authentication; kernel driver vulnerabilities typically require specific memory manipulation expertise
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: December 2023 Android security patch level or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2023-12-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > System update. 2. Install December 2023 or later security patch. 3. Reboot device after installation.
🔧 Temporary Workarounds
Restrict GPU driver access
linuxUse SELinux policies to restrict access to the vulnerable GPU driver interface
🧯 If You Can't Patch
- Restrict physical access to devices and implement strict app installation policies
- Monitor for suspicious privilege escalation attempts using security monitoring tools
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android version. If patch level is before December 2023, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows December 2023 or later in Settings > About phone > Android version📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- SELinux denials for gpu_pixel processes
- Unexpected privilege escalation attempts
Network Indicators:
- None - this is a local vulnerability
SIEM Query:
source="android_kernel" AND ("gpu_pixel" OR "mali_kbase") AND ("buffer overflow" OR "OOB write")