NFSv4: NULL pointer dereference in pnfs_mark_matching_lsegs_return()
Summary
GSD-2021-1000612: NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return(). Affects Kernel versions >= 2fafe7d5047f98791afd9a1d90d2afb70debc590, < f9890652185b72b8de9ebeb4406037640b6e1b53. 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, facilitates communication between software and hardware, and enables the execution of user programs. The NFSv4 (Network File System version 4) is a protocol within the Kernel that allows remote file access over a network. It provides a distributed file system that enables clients to access files on a server as if they were local. This vulnerability affects the NFSv4 implementation in the Kernel.
Vulnerability Detail
The vulnerability identified as GSD-2021-1000612 is a NULL pointer dereference in the pnfs_mark_matching_lsegs_return() function of the NFSv4 implementation. A NULL pointer dereference occurs when a program attempts to access or manipulate data through a null pointer, resulting in a crash or potential code execution. In this case, the vulnerability can be triggered when processing certain network file system requests, leading to a NULL pointer dereference and a system crash. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
The vulnerability GSD-2021-1000612 is a NULL pointer dereference in the pnfs_mark_matching_lsegs_return() function of the NFSv4 implementation in the Linux Kernel. It can lead to a system crash when processing certain network file system requests. To fix this vulnerability, it is crucial to update the Kernel to version v5.10.42 or later. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The impact of this vulnerability is a system crash due to a NULL pointer dereference. However, the actual attack plausibility and potential consequences have not been proven yet.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and the Vulert Playground will analyze it for open-source vulnerabilities, including GSD-2021-1000612.
There is no known exploit for this vulnerability at the moment. However, it is important to apply the recommended fix to mitigate any potential risks.
Yes, this vulnerability can be exploited remotely as it affects the NFSv4 protocol, which allows remote file access over a network.
The recommended solution is to update the Linux Kernel to the latest version. However, if updating is not feasible, you can consider implementing additional security measures such as network segmentation and access controls to mitigate the risk.
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