Many smartphone users are faced with the need to check not just the operating version system, but the specific modification Linux kernelson which it is based. This information is often required when installing custom firmware, diagnosing hardware conflicts, or when trying to obtain root access. The standard settings menu does not always reveal the full picture, hiding technical details behind a beautiful interface.
Understanding which kernel is running in your device gives an idea of its optimization and security. Firmware developers often modify the base kernel to improve the autonomy or performance of a particular one. Knowing the exact version allows you to correctly select drivers and modules that may be incompatible with other assemblies. processor. Knowing the exact version allows you to correctly select drivers and modules that may be incompatible with other assemblies.
In this article we will look at all available methods: from simple settings in the menu to using debugging tools. You will learn to interpret version strings and understand why the kernel number may differ from the Android version.
Checking through the standard settings menu
The easiest and safest way to get basic information about the system is to use the built-in menu of your smartphone. However, it is worth considering that manufacturers often hide detailed data about the kernel deep in partitions. To find the necessary information, go to Settings → About phone.
In the menu that opens, look for the item "Software information" or directly the line "Kernel version". On some devices, such as Samsung or Xiaomi, this information may be hidden inside the Software Information section. By clicking on this item several times, you can see technical data that is usually not displayed.
⚠️ Attention: On smartphones with highly customized shells (MIUI, OneUI, ColorOS), the kernel number may be displayed in abbreviated form. To obtain the complete assembly string, you will need to use third-party utilities or ADB.
The interface may vary depending on the Android version and manufacturer. If you do not find an explicit link to the kernel, try clicking on the item Build numberseveral times in a row. This action will often activate developer mode or open a hidden menu with technical information, where the exact release will be indicated. Linux kernel.
If the menu shows only the kernel build date and not the version number, try copying the entire line - often the version number is encrypted at the end of this line in small print.
Using third-party applications for diagnostics
When the built-in tools are not enough, specialized utilities from the store come to the rescue. Google Play. These applications read data directly from system files /proc/version, providing the user with comprehensive information about the device configuration. They are especially useful if you need to know the processor architecture or support for specific instructions.
One of the most popular tools is the application CPU-Z. After launch, go to the System or Devicetab. There you will find a detailed description of the kernel, including its version, compilation date, and the compiler used (often Clang or GCC). This allows you to evaluate the freshness of the technologies used in the firmware.
Another powerful tool is AIDA64. This app provides deeper analytics including thermal sensors and real-time core frequencies. In the section Android you will see a line Kernel versionthat corresponds to the internal marking of the system. Such data is indispensable when comparing stock firmware and custom builds.
- 📱 CPU-Z —an easy tool for quickly checking the basic characteristics of the processor and core.
- 🛠️ AIDA64 —a professional combine for complete diagnostics of the hardware and software environment.
- 📊 DevCheck —a utility that shows the security status and kernel details in real time.
Receiving data via a computer and ADB
For advanced users involved in modding or deep debugging, the most accurate method is to use the interface ADB (Android Debug Bridge). This method allows you to get “raw” data from the system that is not filtered by the shell interface. You will need to install device drivers and platform tools on your PC.
Connect your smartphone to your computer via a USB cable and make sure that debugging permission is confirmed on the device screen. Open a command prompt or terminal on your computer. To get the kernel version, enter the following command:
adb shell uname -rThis command will display a short version of the kernel. If you need complete information, including the compilation string and GCC version, use the advanced query:
adb shell cat /proc/versionThe output of the command will show not only the version number, but also the name of the user who compiled the kernel, as well as the host machine of the build. This is critical for developers as it allows them to identify a specific source code branch. Errors in the command output may indicate problems with USB drivers or access rights.
☑️ Preparing to work with ADB
Deciphering the numbering of kernel versions
The Android kernel version line often looks like a set of incomprehensible numbers and letters, for example 4.14.117-g1234567. Understanding this structure helps assess the relevance of the device's protection and functionality. The first number indicates the major version of the Linux kernel on which the system is based.
The second number indicates a major release, and the third indicates minor bug fixes and security patches. A suffix after a hyphen (for example, -g...) often denotes a commit hash in the manufacturer's repository, which uniquely identifies the build for a specific smartphone model. This distinguishes the official kernel from the universal one.
| Android version | Typical kernel version | Features |
|---|---|---|
| Android 9 (Pie) | 4.4.x / 4.9.x / 4.14.x | Move to Project Treble |
| Android 10 | 4.9.x / 4.14.x / 4.19.x | Improved privacy |
| Android 11 | 4.14.x / 4.19.x / 5.4.x | Scoped Storage |
| Android 12-14 | 5.4.x / 5.10.x / 5.15.x | Project Mainline and modularity |
It is worth noting that Google requires manufacturers to use certain versions of the kernel to certify new versions of Android. However, many vendors remain on old kernel branches for the sake of compatibility with older hardware drivers. This creates a situation where a fairly old kernel can run on a new Android.
The kernel number does not always correlate with the Android version: Android 13 may have a 4.14 kernel if the manufacturer has not updated the chipset drivers.
Engineering menu and hidden codes
Some manufacturers leave access to technical information through special USSD codes or engineering menu. This method does not require connecting to a PC or installing applications, but does not work on all devices. Codes may differ depending on the brand and processor (MediaTek, Qualcomm, Exynos).
Try entering the code in the "Phone" application ##4636##. On many devices this opens the testing menu, where in the section "Information about the phone" you can find data about the software. For devices based on MediaTek the code often works ##3646633##, which opens a full engineering menu.
⚠️ Attention: Be extremely careful in the engineering menu Changing parameters in the
TelephonyorHardware Testingsections without understanding their purpose may result. to loss of connection or unstable operation of the device.
If standard codes do not work, the manufacturer may have blocked access to them in the stable version of the firmware. In this case, access can only be opened in engineering builds or after obtaining root access. Do not try to guess the codes from the Internet if they are not confirmed for your specific model.
What to do if the codes are not available. do they work?
If entering codes does not bring up a menu, try installing the "Engineering Mode Shortcut" application from the application store. It creates shortcuts to hidden system activities that are called by these codes. This works on most devices without root access.
Why kernel version is important for security
The Linux kernel is the foundation of the security of the entire operating system. Vulnerabilities in the kernel (for example, known exploits like Dirty COW or Pwn2Own) can allow attackers to gain full control of the device. Regular kernel updates close these holes, but smartphone manufacturers are often late in releasing them.
Checking the kernel version allows you to understand how protected your device is from known threats. If you see a very old kernel compilation date on a modern Android, this is a signal that the manufacturer may have neglected security patches. This is especially true for budget models and devices that have been discontinued.
Enthusiasts often install custom kernels to receive the latest security patches before the official release. However, such a procedure requires unlocking the bootloader and carries risks. Before installing any third-party kernel, make sure that it is compatible with your version bootloader and device partitions.
- 🔒 An old kernel is the main cause of data vulnerability even with an antivirus.
- 🚀 Custom kernels can speed up work, but often sacrifice stability for the sake of performance.
- 📉 Kernel support is stopped by the chipset manufacturer, after which security updates become impossible.
Is it possible to update the kernel without flashing the entire Android?
Usually no. The kernel is tightly coupled with the rest of the system and drivers. Updating the kernel requires flashing the entire image boot.img. The exception is projects like Google GKI (Generic Kernel Image) in new versions of Android, which allow you to update the kernel modularly, but this technology is still rarely found on mass devices.
Does the kernel version affect the operation of banking applications?
Yes, indirectly. Banking applications check the integrity of the system and the presence of root access. If you installed a custom kernel, the system may be marked as compromised (violation SafetyNet or Play Integrity), which will block applications. A stock kernel signed by the manufacturer usually passes tests without problems.
Where can I find the kernel source code for my phone?
According to the GPL license, manufacturers are required to publish the kernel source code. It is usually posted on the official brand support website in the developer section or on the GitHub of the manufacturer's organization (for example android_kernel_xiaomi_sm8250). The search should be carried out by the code name of the device or processor model.