Vulnerability in btrfs Direct IO Write Path in Linux Kernel

Kernel Updated 02 Oct 2025

Summary

24/04/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1000990: btrfs: release correct delalloc amount in direct IO write path. Affects Kernel versions >= f0bfa76a11e93d0fe2c896fcb566568c5e8b5d3f, < a04d37ddfe4be431b9e52e8504490376ab0a39a4. No fix is published. How to fix ↓

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Background

The btrfs package is a file system for Linux that provides advanced features such as snapshots, pooling, and compression. It is widely used in various Linux distributions. The direct IO write path is responsible for handling direct input/output operations, bypassing the page cache. This vulnerability affects the btrfs package in the Linux Kernel.

Vulnerability Detail

The vulnerability in the btrfs direct IO write path results in an incorrect release of delalloc (delayed allocation) amount. Delalloc is a mechanism used by file systems to allocate disk space on-demand when a file is written. Due to the incorrect release of delalloc, it may lead to resource leaks and potential denial-of-service attacks. The vulnerability was introduced in version v5.17 of the Linux Kernel and is fixed in version v5.17.4.

How To Fix

No fixed version is published for this vulnerability.

To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.17.4 or later. This can be done by downloading the latest stable version of the Linux Kernel from the official repository and following the installation instructions provided. After updating the Kernel, the vulnerability should be resolved.

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Workaround

There is no specific workaround mentioned for this vulnerability.

Conclusion

The vulnerability in the btrfs direct IO write path can be fixed by updating the Linux Kernel to version v5.17.4 or later. For further support on vulnerability remediation, please contact DevNack.com.

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