Vulnerability in btrfs: fsync failure and transaction abort after writes to prealloc extents

Kernel Updated 02 Oct 2025

Summary

25/06/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1000817: btrfs: fix fsync failure and transaction abort after writes to prealloc extents. Affects Kernel versions < b37885cc013516f0412d7d2e99f043dd112c99a6. No fix is published. How to fix ↓

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Background

The btrfs package is a part of the Linux Kernel ecosystem and is responsible for providing support for the B-tree file system. It offers advanced features such as snapshots, pooling, and checksums, making it a popular choice for many Linux distributions. However, a vulnerability has been discovered in btrfs that can lead to fsync failure and transaction abort after writes to preallocated extents.

Vulnerability Detail

The vulnerability in btrfs occurs when there are writes to preallocated extents. This can result in fsync failure and transaction abort, potentially leading to data corruption or loss. The issue was introduced in an earlier version of the Linux Kernel and has been fixed in version v5.12.10. The impact and attack plausibility of this vulnerability have not been proven yet.

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 v5.12.10 or later. This can be done by applying the commit b37885cc013516f0412d7d2e99f043dd112c99a6. Updating the Kernel will ensure that the fsync failure and transaction abort issue is resolved.

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Workaround

There is no specific workaround mentioned for this vulnerability.

Conclusion

The vulnerability in btrfs that causes fsync failure and transaction abort after writes to preallocated extents can be resolved by updating the Linux Kernel to version v5.12.10 or later. It is important to apply the fix to prevent potential data corruption or loss. For further support on vulnerability remediation, you can reach out to DevNack.com.

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