CVE-2025-20671
📋 TL;DR
This CVE describes a local privilege escalation vulnerability in MediaTek thermal management components. An attacker with System privilege can exploit a race condition to perform out-of-bounds writes, potentially gaining elevated privileges. The vulnerability affects MediaTek-based devices and requires no user interaction for exploitation.
💻 Affected Systems
- MediaTek thermal management components
📦 What is this software?
Android by Google
Android by Google
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with root/kernel-level access, allowing installation of persistent malware, data theft, and bypassing all security controls.
Likely Case
Local privilege escalation from System to higher privileges (potentially root), enabling further lateral movement and persistence establishment.
If Mitigated
Limited impact if proper privilege separation and SELinux/apparmor policies are enforced to restrict System privilege access.
🎯 Exploit Status
Requires race condition exploitation and System privilege as prerequisite. No public exploit available at time of analysis.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patched in firmware updates containing ALPS09698599
Vendor Advisory: https://corp.mediatek.com/product-security-bulletin/May-2025
Restart Required: Yes
Instructions:
1. Check with device manufacturer for firmware updates. 2. Apply MediaTek-provided patch ALPS09698599. 3. Reboot device after patch installation. 4. Verify patch application through version checks.
🔧 Temporary Workarounds
Restrict System Privilege Access
linuxImplement strict SELinux/apparmor policies to limit what System-privileged processes can access.
# Review and tighten SELinux policies for thermal-related processes
# audit2allow -a to identify thermal policy violations
# semanage permissive -d thermal_t (if applicable)
🧯 If You Can't Patch
- Implement strict application sandboxing and privilege separation to limit System privilege access
- 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 thermal driver version information.Check Version:
# dmesg | grep -i thermal OR check device firmware version in settingsVerify Fix Applied:
Verify patch ALPS09698599 is applied through firmware version checks or thermal driver version verification.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs related to thermal driver
- SELinux/apparmor denials for thermal processes
- Unexpected privilege escalation attempts from System context
Network Indicators:
- None - this is a local privilege escalation
SIEM Query:
source="kernel" AND ("thermal" OR "race condition") AND ("panic" OR "oops" OR "privilege escalation")