NFSv4: Fix an Oops in pnfs_mark_request_commit() when doing O_DIRECT

Kernel Updated 02 Oct 2025

Summary

03/08/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1001192: NFSv4: Fix an Oops in pnfs_mark_request_commit() when doing O_DIRECT. Affects Kernel versions >= 9c455a8c1e146dac3a6d1405fe6a7096177b9546, < 7aec9f862411906f8c27071ba65a1e110ad7d2fd. No fix is published. How to fix ↓

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Background

The Kernel is an open-source software that serves as the core component of the Linux operating system. It provides essential functionalities, such as managing system resources, facilitating communication between hardware and software components, and enabling 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. The pnfs_mark_request_commit() function is a part of NFSv4 that handles marking requests for commit when using the O_DIRECT flag. O_DIRECT is a flag that allows direct I/O operations without involving the page cache.

Vulnerability Detail

The vulnerability identified as GSD-2021-1001192 in the Kernel's NFSv4 component occurs in the pnfs_mark_request_commit() function when performing O_DIRECT operations. This vulnerability can lead to an Oops, which is a kernel panic or crash, potentially resulting in a denial of service (DoS) condition. The issue was introduced in version v5.7 of the Linux Kernel and has been fixed in version v5.13.4. The impact and attack plausibility of this vulnerability have not been proven.

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 in the NFSv4 component of the Linux Kernel, identified as GSD-2021-1001192, can lead to a denial of service (DoS) condition. It is recommended to update the Kernel to version v5.13.4 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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