ext4: Avoid Cycles in Directory H-Tree Vulnerability in Kernel
Summary
GSD-2022-1002926: ext4: avoid cycles in directory h-tree. Affects Kernel versions < d5a16a6df2c16eaf4de04948553ef0089dee463f. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and interfaces with hardware devices. It manages system resources, facilitates communication between software and hardware, and ensures the stability and security of the system. The ext4 file system is widely used in Linux and offers improved performance and reliability compared to its predecessors. It utilizes a hierarchical tree structure (H-tree) to organize directory entries efficiently. However, a vulnerability has been discovered in the ext4 file system that allows the creation of cycles in the directory H-tree, leading to potential security risks.
Vulnerability Detail
The ext4 vulnerability involves the creation of cycles in the directory H-tree. An attacker can exploit this vulnerability by crafting a malicious directory structure that contains cycles, causing the file system to enter an infinite loop when traversing the directory tree. This can result in denial of service (DoS) conditions, system instability, or even arbitrary code execution. The vulnerability has been addressed in Linux Kernel version v5.17.14 by commit d5a16a6df2c16eaf4de04948553ef0089dee463f.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is essential to apply the patch or update the Linux Kernel to the fixed version as soon as possible.
Conclusion
The ext4 vulnerability in the Kernel allows the creation of cycles in the directory H-tree, leading to potential denial of service (DoS) conditions, system instability, or arbitrary code execution. It is recommended to update the Linux Kernel to version v5.17.14 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability allows an attacker to create directory structures that cause the ext4 file system to enter an infinite loop, leading to denial of service (DoS) conditions, system instability, or potential arbitrary code execution.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. It analyzes the manifest file (e.g., package-lock.json) of your application and provides real-time alerts for open-source vulnerabilities, including the ext4 vulnerability.
No, updating the Linux Kernel to the fixed version is the recommended solution. There is no known workaround for this vulnerability.
The vulnerability exists in versions of the Linux Kernel prior to v5.17.14. It has been fixed in Linux Kernel version v5.17.14 and later.
There is no information available regarding active exploitation of this vulnerability in the wild. However, it is crucial to apply the patch or update the Linux Kernel to ensure system security.
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