CVE-2021-37089
📋 TL;DR
This vulnerability in Huawei smartphones running HarmonyOS involves incomplete cleanup of kernel resources, which could allow an attacker to cause a kernel panic and system restart. It affects Huawei smartphones with specific HarmonyOS versions. The vulnerability requires local access to exploit.
💻 Affected Systems
- Huawei smartphones
📦 What is this software?
Harmonyos by Huawei
⚠️ Risk & Real-World Impact
Worst Case
Persistent denial of service through repeated kernel restarts, potentially leading to device instability and data corruption.
Likely Case
Temporary denial of service causing device reboot, disrupting user operations and potentially causing data loss in unsaved applications.
If Mitigated
Minimal impact if patched or if device has restricted local access controls.
🎯 Exploit Status
Requires local access and specific conditions to trigger the incomplete cleanup. No public exploit code available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: HarmonyOS 2.0.0.230 and later
Vendor Advisory: https://device.harmonyos.com/en/docs/security/update/security-bulletins-202109-0000001196270727
Restart Required: Yes
Instructions:
1. Check current HarmonyOS version in Settings > About phone. 2. If version is before 2.0.0.230, go to Settings > System & updates > Software update. 3. Download and install available updates. 4. Restart device after update completes.
🔧 Temporary Workarounds
Restrict local app installations
allPrevent installation of untrusted applications that could exploit the vulnerability
Enable verified boot
allEnsure device only runs signed, verified software
🧯 If You Can't Patch
- Restrict physical access to devices
- Implement mobile device management (MDM) to control app installations
🔍 How to Verify
Check if Vulnerable:
Check HarmonyOS version in Settings > About phone. If version is earlier than 2.0.0.230, device is vulnerable.Check Version:
Not applicable - check through device settings interfaceVerify Fix Applied:
After update, verify HarmonyOS version is 2.0.0.230 or later in Settings > About phone.📡 Detection & Monitoring
Log Indicators:
- Unexpected kernel panics
- Frequent device reboots
- Kernel crash logs
Network Indicators:
- Not applicable - local vulnerability
SIEM Query:
Not applicable for typical enterprise SIEM as this is a mobile device vulnerability