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-2021-1000652: btrfs: do not BUG_ON in link_to_fixup_dir. Affects Kernel versions < 6eccfb28f8dca70c9b1b3bb3194ca54cbe73a9fa. No fix is published. How to fix ↓

Free scan

Check if this vulnerability affects your application

Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.

Check my app free

No signup required · Results in about 60 seconds

Upload your dependency manifest or SBOM

Drag & drop your file here or Browse

Java Javascript PHP Python Go Rust Ruby Dart C/C++ Elixir CycloneDX SPDX

Upload a supported dependency manifest or SBOM. No installation or source-code access required.

See supported files and SBOM formats

SBOM sbom.json · bom.json · bom.xml · *.spdx.json · *.cdx.json · *.cdx.xml

Java pom.xml · gradle.lockfile · buildscript-gradle.lockfile

Javascript package-lock.json · yarn.lock · pnpm-lock.yaml

PHP composer.lock

Python poetry.lock · requirements.txt · Pipfile.lock

Go go.mod

Rust Cargo.lock

Ruby Gemfile.lock

Dart pubspec.lock

C/C++ conan.lock

Elixir mix.lock

Enter your work email to receive your report link.

Verify your email to view the full report and start 30 days of continuous monitoring. No credit card required.

Background

The btrfs package is a file system for Linux that provides advanced features such as snapshots, pooling, and checksums. It is widely used in various Linux distributions. However, a vulnerability has been discovered in the package that could potentially lead to security issues.

Vulnerability Detail

The vulnerability in btrfs arises from a BUG_ON statement in the link_to_fixup_dir function. This statement triggers a kernel panic when certain conditions are met, potentially allowing an attacker to crash the system or execute arbitrary code. The impact and attack plausibility of this vulnerability have not been proven yet.

How To Fix

No fixed version is published for this vulnerability.

Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →

Workaround

There is no known workaround for this vulnerability. It is recommended to apply the fix mentioned above.

Conclusion

In conclusion, a vulnerability has been discovered in the btrfs package that could potentially lead to system crashes or arbitrary code execution. It is recommended to update the Linux Kernel to version v4.19.193 or a later version to mitigate this vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.

See every vulnerability recorded for Kernel →