Vulnerability in Kernel package: userfaultfd release page in error path to avoid BUG_ON
Summary
GSD-2021-1000407: userfaultfd: release page in error path to avoid BUG_ON. Affects Kernel versions >= cb658a453b9327ce96ce5222c24d162b5b65b564, < b3f1731c6d7fbc1ebe3ed8eff6d6bec56d76ff43. No fix is published. How to fix ↓
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Background
The Kernel package is a critical component of the Linux operating system. It provides the core functionality and acts as an interface between the hardware and software layers. The userfaultfd subsystem in the Kernel allows user-space processes to handle page faults, enabling efficient memory management. However, a vulnerability has been discovered in the userfaultfd subsystem that could potentially be exploited by attackers.
Vulnerability Detail
The vulnerability in the userfaultfd subsystem arises from a missing release of a page in the error path, which can lead to a BUG_ON condition. This vulnerability was introduced in version v4.11 of the Linux Kernel and has been fixed in version v5.4.120. If exploited, an attacker may be able to trigger a denial-of-service (DoS) condition or potentially execute arbitrary code with elevated privileges. It is important to note that the impact and attack plausibility of this vulnerability have not been proven.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can apply patches or backports provided by their Linux distribution's security team. These patches may address the specific vulnerability and can be applied without upgrading the entire Kernel. It is important to consult the documentation and support channels of the respective Linux distribution for guidance on applying patches or backports.
Conclusion
In conclusion, a vulnerability has been identified in the userfaultfd subsystem of the Kernel package. It is crucial to update the Linux Kernel to version v5.4.120 or later to mitigate the risk of exploitation. Applying patches or backports provided by the Linux distribution's security team can also serve as a temporary workaround. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The userfaultfd subsystem in the Kernel allows user-space processes to handle page faults, facilitating efficient memory management.
BUG_ON is a macro used in the Linux Kernel code to assert certain conditions. If a BUG_ON condition evaluates to true, it triggers a kernel panic, halting the system.
If exploited, this vulnerability could lead to a denial-of-service (DoS) condition or enable an attacker to execute arbitrary code with elevated privileges.
No, the impact and attack plausibility of this vulnerability have not been proven.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will provide real-time alerts for open-source vulnerabilities.
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