Race Condition Vulnerability in configfs
Summary
GSD-2022-1000855: configfs: fix a race in configfs_{,un}register_subsystem(). Affects Kernel versions >= 7063fbf2261194f72ee75afca67b3b38b554b5fa, < a7ab53d3c27dfe83bb594456b9f38a37796ec39b. No fix is published. How to fix ↓
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Background
The Linux Kernel is an open-source monolithic Unix-like computer operating system kernel. It provides the essential services for the operating system, such as process management, memory management, and device drivers. The configfs subsystem in the Linux Kernel allows users to create a virtual file system for configuring kernel objects dynamically. It provides a way to organize and manage kernel objects in a hierarchical structure.
However, a race condition vulnerability has been discovered in the configfs subsystem. This vulnerability can be exploited by an attacker to cause a denial of service or potentially execute arbitrary code with kernel privileges.
Vulnerability Detail
The race condition vulnerability in the configfs subsystem occurs in the configfs_register_subsystem() and configfs_unregister_subsystem() functions. These functions are responsible for registering and unregistering a subsystem in the configfs virtual file system. The vulnerability arises due to a race condition between multiple threads attempting to register or unregister the same subsystem simultaneously.
An attacker can exploit this vulnerability by triggering the race condition, leading to inconsistent internal data structures. This can result in various consequences, such as a kernel crash, system instability, or even arbitrary code execution with kernel privileges.
The vulnerability was introduced in version 2.6.16 of the Linux Kernel and has been fixed in version 5.10.103.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable the configfs subsystem if it is not required for their system. This can be achieved by blacklisting the 'configfs' module or by configuring the kernel to exclude the 'configfs' subsystem during compilation. However, this workaround may impact the functionality of certain applications or features that rely on the configfs subsystem.
Conclusion
In conclusion, a race condition vulnerability has been identified in the configfs subsystem of the Linux Kernel. This vulnerability can be exploited by an attacker to cause a denial of service or execute arbitrary code with kernel privileges. It is recommended to update the Linux Kernel to version 5.10.103 or later to mitigate this vulnerability. If you have any further questions or need assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
Configfs is a virtual file system in the Linux Kernel that allows users to dynamically configure kernel objects. It provides a hierarchical structure for organizing and managing these objects.
A race condition vulnerability occurs when multiple threads or processes access shared resources concurrently, leading to unexpected and potentially harmful behavior. In this case, the race condition can result in inconsistent internal data structures in the configfs subsystem.
The potential consequences of this vulnerability include a denial of service, system instability, or arbitrary code execution with kernel privileges. An attacker can exploit the vulnerability to crash the kernel or gain unauthorized access to the system.
You can use tools like Vulert (https://vulert.com) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in the software.
Yes, a temporary workaround is to disable the configfs subsystem if it is not required for your system. This can be done by blacklisting the 'configfs' module or configuring the kernel to exclude the 'configfs' subsystem during compilation.
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