Vulnerability in btrfs: do not BUG_ON in link_to_fixup_dir

Kernel Updated 02 Oct 2025

Summary

04/06/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

UVI-2021-1000625: btrfs: do not BUG_ON in link_to_fixup_dir. Affects Kernel versions < 0ed102453aa1cd12fefde8f6b60b9519b0b1f003. No fix is published. How to fix ↓

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Background

The btrfs package is a file system for the Linux kernel that provides advanced features such as snapshots, pooling, and checksums. It is designed to be a modern and scalable file system for both local and networked storage. However, a vulnerability has been discovered in the btrfs package that can lead to a denial-of-service (DoS) attack.

Vulnerability Detail

The vulnerability in the btrfs package occurs in the link_to_fixup_dir function. This function contains a BUG_ON statement that can cause the kernel to panic, resulting in a system crash. An attacker can exploit this vulnerability by creating a specially crafted file system image that triggers the BUG_ON statement, leading to a DoS condition. The impact of this vulnerability is limited to systems that have the btrfs file system enabled.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

There is no known workaround for this vulnerability. It is recommended to apply the fix by updating the Linux Kernel to the latest version.

Conclusion

The vulnerability in btrfs can lead to a DoS attack by causing the system to crash. It is crucial to update the Linux Kernel to version v5.4.124 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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