Critical Vulnerability in Linux Kernel: Crash on GPIO Initialization
Summary
DEBIAN-CVE-2025-21783: In the Linux kernel, the following vulnerability has been resolved: gpiolib: Fix crash on error in gpiochip_get_ngpios() The gpiochip_get_ngpios() uses chip_*() macros to print messages. Affects linux versions < 6.12.16-1. Fixed in 6.12.16-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware management and system resources. It is widely used across various platforms, including servers, desktops, and embedded systems. The kernel's functionality includes process management, memory management, device drivers, and system calls. This vulnerability specifically affects the GPIO (General Purpose Input/Output) subsystem, which is responsible for controlling and managing GPIO pins on devices. A flaw in this subsystem can lead to system crashes, impacting the stability and reliability of the operating system.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the GPIO library that can lead to a crash during the initialization of GPIO chips. The function gpiochip_get_ngpios() uses chip_*() macros to print messages, which depend on the gpiodev being initialized. If this function is called during the bgpio_init() process, where gpiodev is not set, it results in a NULL pointer dereference, causing a system crash. This vulnerability can lead to denial of service, affecting the availability of the system and potentially leading to data loss or corruption.
How To Fix
Minimum fixed version
6.12.16-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the patch by updating to the fixed version of the Linux kernel.
Conclusion
The vulnerability identified in the Linux kernel's GPIO subsystem poses a significant risk, leading to potential system crashes and denial of service. It is crucial for users to update to the patched version 6.12.16-1 to mitigate this risk. Regular monitoring and timely updates are essential for maintaining system security.
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FAQ
The vulnerability can lead to a system crash, resulting in denial of service and potential data loss.
You can use Vulert, which monitors and alerts for open-source vulnerabilities. Visit Vulert Scanner to check if your application is affected.
Yes, the patched version of the Linux kernel is 6.12.16-1. Updating to this version will resolve the issue.
While there are no specific workarounds, it is advisable to monitor your system closely and plan for an update as soon as possible.
You can find detailed information in the Debian CVE database or through security advisories related to the Linux kernel.
References
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