jfs: Prevent NULL deref in diFree

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-2022-1002470: jfs: prevent NULL deref in diFree. Affects Kernel versions < d2e45f0bc25da09efcac658d6e405115fcfa83c2. 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 jfs package is a file system driver for the Linux Kernel. It provides support for the Journaled File System (JFS), which is a high-performance file system designed for use on modern, high-end servers. The diFree function in jfs is responsible for freeing a directory index (di) structure. However, a vulnerability exists in this function that can lead to a NULL dereference.

Vulnerability Detail

The vulnerability in jfs's diFree function allows an attacker to trigger a NULL pointer dereference, which can result in a system crash or potentially allow the attacker to execute arbitrary code with kernel privileges. The vulnerability was discovered in the Linux Kernel version v4.9.311 and has been fixed in commit d2e45f0bc25da09efcac658d6e405115fcfa83c2.

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

The jfs package in the Linux Kernel is vulnerable to a NULL dereference issue in the diFree function. This vulnerability can lead to a system crash or potential code execution with kernel privileges. Users are advised to update their Linux Kernel to version v4.9.311 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for Kernel →