CVE-2024-31333
📋 TL;DR
This CVE describes an integer overflow vulnerability in the Android kernel's memory management unit (MMU) that allows local privilege escalation. An attacker with local access can exploit this to execute arbitrary code with kernel privileges without needing user interaction. This affects Android devices running vulnerable kernel versions.
💻 Affected Systems
- Android
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise where an attacker gains kernel-level privileges, potentially installing persistent malware, accessing all user data, and bypassing all security controls.
Likely Case
Local privilege escalation allowing an attacker to elevate from a limited user or app context to full system access, enabling data theft, surveillance, or further system exploitation.
If Mitigated
Limited impact if SELinux/AppArmor policies restrict kernel module loading and system is isolated from untrusted local users.
🎯 Exploit Status
Exploitation requires local access but no authentication. The integer overflow in MMU allocation makes exploitation non-trivial but feasible for skilled attackers.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: August 2024 Android Security Patch or later
Vendor Advisory: https://source.android.com/security/bulletin/2024-08-01
Restart Required: Yes
Instructions:
1. Check for Android system updates in Settings > System > System update. 2. Apply the August 2024 or later security patch. 3. Reboot the device after installation completes.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and network access to devices to prevent local exploitation attempts
Enhanced SELinux policies
linuxImplement strict SELinux policies to limit kernel module loading and system call access
🧯 If You Can't Patch
- Isolate vulnerable devices from untrusted networks and users
- Implement application allowlisting to prevent unauthorized app execution
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android version. If patch level is earlier than August 2024, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows August 2024 or later in Settings > About phone > Android version.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- MMU allocation failure messages in dmesg
- Unexpected privilege escalation attempts
Network Indicators:
- None - this is a local exploit
SIEM Query:
Search for kernel panic events or privilege escalation patterns in system logs