fbdev: defio: fix the pagelist corruption in Kernel
Summary
GSD-2022-1002803: fbdev: defio: fix the pagelist corruption. Affects Kernel versions >= 105a940416fc622406653b6fe54732897642dfbc, < 6a9ae2fe887042f76fd3d334349e64e8ab3c55a2. 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 functionality and interfaces with hardware devices. It manages system resources, including memory, processes, and input/output operations. The fbdev subsystem within the Kernel is responsible for supporting frame buffer devices, which are used for graphical output on displays. The defio module is a part of the fbdev subsystem and handles memory management for frame buffer devices. It is used to allocate and manage memory pages for frame buffers.
The vulnerability in the defio module can lead to pagelist corruption. This can potentially result in memory corruption, leading to system instability or unauthorized access to sensitive information. The corruption can occur due to a flaw in the implementation of pagelist handling in the defio module.
Vulnerability Detail
The vulnerability in the defio module of the fbdev subsystem allows for pagelist corruption. This can be exploited by an attacker to cause memory corruption, leading to system instability or unauthorized access to sensitive information. The pagelist corruption occurs due to a flaw in the implementation of pagelist handling in the defio module. The impact and attack plausibility of this vulnerability have not been proven yet.
The vulnerability was introduced in version v5.18 of the Linux Kernel by commit 105a940416fc622406653b6fe54732897642dfbc. It has been fixed in version v5.18.3 by commit 6a9ae2fe887042f76fd3d334349e64e8ab3c55a2.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround available for this vulnerability. The recommended approach is to apply the fix by updating the Linux Kernel to the latest version.
Conclusion
The vulnerability in the defio module of the fbdev subsystem in the Kernel can result in pagelist corruption, leading to memory corruption and potential unauthorized access to sensitive information. It is recommended to update the Linux Kernel to version v5.18.3 or later to fix this vulnerability. No specific workaround is available. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The fbdev subsystem in the Kernel is responsible for supporting frame buffer devices, which are used for graphical output on displays. It provides the necessary interfaces and functionality for managing frame buffers and interacting with graphics hardware.
The defio module is a part of the fbdev subsystem in the Kernel. It handles memory management for frame buffer devices, including the allocation and management of memory pages for frame buffers.
Pagelist corruption refers to the situation where the list of memory pages associated with a particular data structure becomes corrupted. This can lead to memory corruption and potentially cause system instability or unauthorized access to sensitive information.
An attacker can exploit this vulnerability by crafting malicious input that triggers the pagelist corruption in the defio module. This can lead to memory corruption, which can be further exploited to gain unauthorized access to sensitive information or disrupt the system's operation.
At the time of this report, there is no known proof of concept or exploit code available for this vulnerability. However, it is important to apply the recommended fix to mitigate the risk.
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