CVE-2025-36903
📋 TL;DR
CVE-2025-36903 is a memory corruption vulnerability in Android's lwis_io_buffer_write function that allows local privilege escalation without user interaction. Attackers can exploit improper input validation to read/write out-of-bounds memory, potentially gaining elevated system privileges. This affects Android devices, particularly Google Pixel phones.
💻 Affected Systems
- Google Pixel phones
- Android devices with vulnerable kernel drivers
📦 What is this software?
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise with root/system-level access, allowing installation of persistent malware, data theft, and complete control over the device.
Likely Case
Local privilege escalation enabling attackers to bypass security restrictions, access sensitive data, and install malicious applications.
If Mitigated
Limited impact if devices are fully patched and have additional security controls like SELinux enforcement and app sandboxing.
🎯 Exploit Status
Exploitation requires local access but no user interaction. The vulnerability is in kernel-space code, making reliable exploitation moderately complex.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: September 2025 Android security patch level or later
Vendor Advisory: https://source.android.com/security/bulletin/pixel/2025-09-01
Restart Required: Yes
Instructions:
1. Check for system updates in Settings > System > System update. 2. Install the September 2025 security patch. 3. Reboot the device to apply the kernel patch.
🔧 Temporary Workarounds
Restrict local access
allLimit physical and remote local access to vulnerable devices through device management policies
🧯 If You Can't Patch
- Isolate vulnerable devices from sensitive networks and data
- Implement strict access controls and monitor for suspicious local privilege escalation attempts
🔍 How to Verify
Check if Vulnerable:
Check Android security patch level in Settings > About phone > Android version. If patch level is earlier than September 2025, device is vulnerable.Check Version:
adb shell getprop ro.build.version.security_patchVerify Fix Applied:
Verify security patch level shows 'September 5, 2025' or later in Settings > About phone > Android version.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- SELinux denials for lwis driver
- Unexpected privilege escalation in audit logs
Network Indicators:
- None - this is a local exploit
SIEM Query:
source="android_kernel" AND (event="segfault" OR event="oops") AND process="lwis"