NFS Vulnerability in Linux Kernel

Kernel Updated 02 Oct 2025

Summary

04/06/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1000694: NFS: fix an incorrect limit in filelayout_decode_layout(). Affects Kernel versions >= 16b374ca439fb406e46e071f75428f5b033056f8, < b287521e9e94bb342ebe5fd8c3fd7db9aef4e6f1. No fix is published. How to fix ↓

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Background

The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and providing essential services. It is a critical part of the Linux ecosystem and widely used in various devices and servers. The NFS (Network File System) is a distributed file system protocol that allows remote file access over a network. It is implemented in the Linux Kernel and used for sharing files between systems. However, a vulnerability has been discovered in the NFS implementation that could potentially be exploited by attackers.

Vulnerability Detail

The vulnerability in the NFS implementation is related to an incorrect limit in the filelayout_decode_layout() function. This flaw could be exploited by an attacker to cause a denial-of-service (DoS) condition or potentially execute arbitrary code with elevated privileges. The vulnerability was introduced in version v2.6.37 of the Linux Kernel and has been fixed in version v4.9.271. 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

If updating the Linux Kernel is not immediately feasible, a possible workaround is to disable the NFS service or restrict access to NFS shares to trusted networks or hosts. This can be done by modifying the NFS configuration files and restarting the NFS service. However, it is important to note that this workaround may impact the functionality of NFS and should be considered temporary until the kernel update can be applied.

Conclusion

In conclusion, a vulnerability has been discovered in the NFS implementation in the Linux Kernel. It is important to update the Linux Kernel to the latest version to mitigate the risk of exploitation. If immediate kernel update is not possible, disabling the NFS service or restricting access to NFS shares can serve as a temporary workaround. For further support and assistance in vulnerability remediation, please contact DevNack.com.

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