Vulnerability in Kernel: userfaultfd release page in error path to avoid BUG_ON
Summary
GSD-2021-1000321: userfaultfd: release page in error path to avoid BUG_ON. Affects Kernel versions >= cb658a453b9327ce96ce5222c24d162b5b65b564, < 140cfd9980124aecb6c03ef2e69c72d0548744de. No fix is published. How to fix ↓
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Background
The Kernel is a critical 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. The userfaultfd feature in the Kernel allows user-space processes to handle page faults. However, a vulnerability has been discovered in the userfaultfd implementation that could lead to a BUG_ON error, potentially impacting system stability and security.
Vulnerability Detail
The vulnerability arises from a missing release of a page in the error path of the userfaultfd implementation. This omission can trigger a BUG_ON error, which may result in system crashes or other unexpected behavior. An attacker could potentially exploit this vulnerability to cause a denial-of-service (DoS) condition or execute arbitrary code with elevated privileges. The vulnerability was introduced in Kernel version 4.11 and has been fixed in version 5.10.38.
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 official fix by updating the Linux Kernel to the recommended version.
Conclusion
The vulnerability in the Kernel's userfaultfd implementation can lead to system instability and potential security risks. It is crucial to update the Linux Kernel to version 5.10.38 or later to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to system crashes, unexpected behavior, and potential privilege escalation, which may be exploited by attackers to cause a denial-of-service (DoS) condition or execute arbitrary code.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your manifest file (e.g., package-lock.json) to the playground, and it will provide real-time alerts for open-source vulnerabilities, including this one.
At the time of this report, no known exploits for this vulnerability have been disclosed. However, it is crucial to apply the recommended fix to mitigate any potential risks.
The vulnerability itself does not provide remote exploitation capabilities. However, if an attacker gains access to the affected system, they could potentially exploit this vulnerability to execute arbitrary code or cause a DoS condition.
If updating the Kernel is not immediately feasible, it is recommended to implement other security measures, such as network segmentation, access controls, and regular monitoring, to minimize the risk of exploitation.
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