Vulnerability in Kernel: userfaultfd release page in error path to avoid BUG_ON

Kernel Updated 02 Oct 2025

Summary

31/05/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

UVI-2021-1000465: userfaultfd: release page in error path to avoid BUG_ON. Affects Kernel versions >= cb658a453b9327ce96ce5222c24d162b5b65b564, < 319116227e52d49eee671f0aa278bac89b3c1b69. No fix is published. How to fix ↓

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Background

The Kernel is a crucial component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities for the proper functioning of the system. However, a vulnerability has been identified in the Kernel related to the userfaultfd feature.

Vulnerability Detail

The userfaultfd vulnerability arises from a flaw in the release page process within the error path, which fails to avoid triggering a BUG_ON condition. This vulnerability was introduced in version v4.11 of the Linux Kernel and affects all subsequent versions until v4.14.233. While the exact impact and exploitability of this vulnerability have not been proven, it has the potential to be exploited by malicious actors to gain unauthorized access or disrupt system operations.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

No specific workaround has been provided for this vulnerability. It is advised to apply the recommended fix by updating the Linux Kernel to the patched version.

Conclusion

In conclusion, the userfaultfd vulnerability in the Kernel poses a potential risk to system security and stability. It is crucial to update the Linux Kernel to the patched version to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for Kernel →

FAQ

What is the impact of this vulnerability?

The exact impact of this vulnerability is yet to be determined. However, it has the potential to be exploited by attackers to gain unauthorized access or disrupt system operations.

How can I check if my system is affected by this vulnerability?

You can utilize the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your manifest file, such as package-lock.json, and the playground will provide real-time alerts for any open-source vulnerabilities, including this one.