Vulnerability in Kernel: mm, thp: bail out early in collapse_file for writeback page
Summary
UVI-2021-1002194: mm, thp: bail out early in collapse_file for writeback page. Affects Kernel versions >= 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0, < 74c42e1baacf206338b1dd6b6199ac964512b5bb. 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 functions for memory management, process scheduling, and device drivers. The mm subsystem within the Kernel is responsible for managing memory, including transparent huge pages (thp). Transparent huge pages are a feature that improves memory efficiency by allowing the Kernel to use larger page sizes. However, a vulnerability has been discovered in the mm subsystem that affects the collapse_file function for writeback pages.
Vulnerability Detail
The vulnerability in the Kernel's mm subsystem occurs during the collapse_file process for writeback pages. The issue was introduced in version v5.4 of the Linux Kernel and is fixed in version v5.15. When collapsing file-backed pages, the Kernel may encounter a writeback page and fail to handle it correctly, leading to potential security vulnerabilities. The impact and attack plausibility of this vulnerability have not been proven yet. However, if successfully exploited, an attacker may be able to gain unauthorized access, escalate privileges, or cause denial-of-service conditions.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. However, users can mitigate the risk by applying the recommended fix and updating to the latest version of the Linux Kernel.
Conclusion
In conclusion, a vulnerability has been identified in the Kernel's mm subsystem that affects the collapse_file process for writeback pages. It is crucial to update the Linux Kernel to version v5.15 or later to mitigate the risk associated with this vulnerability. By following the recommended fix and keeping your system up to date, you can ensure the security and stability of your Linux-based systems. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
If successfully exploited, this vulnerability could allow an attacker to gain unauthorized access, escalate privileges, or cause denial-of-service conditions.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and Vulert will analyze it in real-time.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the recommended fix and keep your system up to date to mitigate any potential risks.
The specific prerequisites for exploiting this vulnerability have not been disclosed. However, it is always advisable to keep your system updated with the latest security patches and follow best practices for system hardening.
The discovery of this vulnerability is credited to an automated ID system. The actual impact and attack plausibility have not been proven yet.
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