Why Xiaomi’s security core is more important than you think
When it comes to security for Xiaomi smartphones, most users think of MIUIs, passwords, or fingerprints, but the real heart of security lies deeper in the Security Kernel, not just a set of features, but a whole system that works at the operating system and hardware level, controlling access to data, applications, and even hardware.
In 2026, Xiaomi is actively developing this direction, integrating the security core into all new models – from budget Redmi to flagship Xiaomi 14 Ultra. However, many owners do not even suspect that it exists until they encounter account locks, application rights restrictions or warnings about suspicious activity. In this article, we will examine how the security core works, how it differs from standard MIUI functions, and why its settings can save your data from leaks or viruses.
Spoiler: If you've ever seen the message, "This action is blocked by security policy," that's it, and today you'll learn how to manage these locks, not fight them.
What is Xiaomi’s security kernel and how did it come about?
Xiaomi Security Kernel is a proprietary development of the company that debuted in 2018 alongside MIUI 10, originally a response to criticism for poor data protection in early firmware, and today it is a full-fledged package that includes:
- 🔒 Hardware isolation – access control to memory chip, module NFC and biometric sensors.
- 🛡️ Behavioral Analysis – Monitoring Application Activity in Real Time.
- 🔑 Encryption key management – data protection even when physically accessing a device.
- 📱 Integration with MIUI — Connection with functions like “Secure Application” or “Second Space".
The main difference from classic antiviruses is that the kernel works at the Android kernel level (hence the name), not as a regular application, which means that it can block dangerous actions before they even begin to occur, for example, if an attacker tries to get root access through a vulnerability, the security kernel will intercept the attempt and block the process.
Interesting fact: in the Xiaomi 13/14 series and Redmi K60, the security core received hardware acceleration thanks to a specialized Surge G1 chip that handles cryptographic operations, which made protection not only more reliable, but also faster - without interface brakes.
The main functions of the security kernel: what it can do in practice
Let's look at specific scenarios where the security core is manifesting itself, and most users encounter it in the following situations:
| Function | How it works | Example of use |
|---|---|---|
| Blocking Uncertified Applications | Checks the digital signature APK-files before installation. | It prohibits the installation of modified WhatsApp from a third party site. |
| Protection against attacks via USB | Limits access to data when connecting to a PC in MTP mode. | Requires password confirmation to transfer files to your computer. |
| Control of the rights of the superuser | Blocks attempts to obtain root without an official unlocker. | The Magisk will be terminated if it is not installed through the Mi Unlock Tool. |
| Encrypting sensitive data | Stores passwords and biometrics in a protected memory area. | Even if the phone is stolen, the attacker will not be able to extract fingerprints. |
| Monitoring of network activity | Tracks suspicious app connections. | Blocks an application that tries to send an SMS to a paid number. |
The important thing is that the security kernel does not replace the antivirus, but complements it, and it does not scan files for viruses, but can block the actions of an infected application if they violate security policies.
One of the most useful uses is phishing protection, for example, if you type in a Mi Account password on a fake site, the kernel can recognize a suspicious domain and show a warning, which works even without an antivirus installed.
💡
If you frequently install APKs from unknown sources, add them to the whitelist in the security kernel settings (Settings → Password and Security → Security Core → Risk Management).
How to turn on, configure or disable the security core
By default, the security kernel is active on all Xiaomi devices with MIUI 12 and later. However, some features may be hidden or require additional configuration.
Open the Settings. → Password and security|Select the Security Core|Check the status of the protection (should be "Actively")|Set up exceptions for trusted applications|Enable the option to scan for system vulnerabilities"-->
To deactivate the kernel completely, you will need:
- Go to Settings → About Phone → MIUI version (click 7 times to activate the developer mode).
- Back to the settings → Additional → for developers.
- Find the option to Disable the Security Kernel (could be called Disable Security Kernel on global firmware).
- Confirm the action with a password from Mi Account.
⚠️ Warning: Disabling the security core deprives you of warranty support Xiaomi. In the event of theft or loss of the phone, it will be impossible to recover data - even through an official service center.
On some models (such as the POCO F5 or Redmi Note 12 Pro+), the security core is integrated with the Remote Lock feature, which means that if you lose your device, you can block it through the i.mi.com site, and an attacker will not be able to reset your settings without your password.
Distinguishing the security kernel from MIUI Protection and Google Play Protect
Many people confuse the core of security with other defense mechanisms.
- 📱 MIUI Protection is a set of features in the firmware interface (app lock, hidden albums, spam protection). Works at the application level, can be disabled by the user.
- 🛡️ Security core: A system component that cannot be completely removed without root access.
- 🤖 Google Play Protect is a service from Google that scans apps for viruses, does not have access to hardware modules and does not block system calls.
For example, if a malicious application tries to:
- Install from APK – it will be blocked by Google Play Protect.
- Accessing the camera without permission will prevent MIUI Protection.
- Intercept SMS or change system files – the security kernel will intervene.
Practical advice: For maximum protection, it is recommended to use all three layers simultaneously. The security core closes vulnerabilities at a low level, and MIUI Protection and Play Protect filter threats at the application level.
What happens if you turn off all levels of protection?
Security Core Problems and Errors: How to Solve Them
Despite the benefits, the core security sometimes creates problems, and here are the most common mistakes and solutions:
| Mistake. | Reason. | Decision |
|---|---|---|
| Security Kernel blocked this action | The application attempts to gain root access or change system files. | Add the app to the exceptions or update it to the official version. |
| Device is locked by security policy | The device is linked to a corporate account (e.g., via Android Enterprise). | Contact the account administrator or reset via fastboot. |
| Cannot connect to the PC in MTP mode | The security core blocks data transmission without confirmation. | Unlock your phone and confirm your trust in your computer. |
| Persistent password requests when installing APK | The option "Application Signature Verification" is enabled. | Turn it off in Settings → Security Core → Risk Management. |
If the security kernel starts to work incorrectly after the MIUI update (for example, it blocks legitimate applications), try:
- Clear the cache in Settings → Applications → Application Management → Security Core.
- Reset security settings to factory settings (Settings → Password & Security → Reset security settings).
- Update the firmware via fastboot if OTA-The update was made with errors.
⚠️ Note: Some models (e.g. Xiaomi) 12T) Resetting security settings will lock Mi Account for 72 hours.Be sure to remember your account password before the procedure!
The core of security in different models Xiaomi: what has changed
The functionality of the security kernel depends on the device model and the version of MIUI. Here are the key differences:
- 📱 Redmi and POCO (Budget segment: Security core simplified – no hardware acceleration, but basic features (root lock, installation control) APK) work.
On global firmware (MIUI Global) some kernel functions may be disabled at the request of local legislation. EU-There is no control over the traffic of applications due to the rules GDPR.
How to find out the security kernel version?
Go to Settings → About Phone → MIUI version and press 5 times on “Security Core” and a menu will appear with detailed information, including the module version and active policies list.
💡
On flagship models (Xiaomi 13 Ultra, MIX Fold 3), the security core is paired with a Surge C2 chip that handles neural networks, which allows AI to detect threats — for example, to recognize phishing sites by behavioral patterns.