Vulnerability in Linux Kernel: mm, thp: bail out early in collapse_file for writeback page
Summary
GSD-2021-1002125: mm, thp: bail out early in collapse_file for writeback page. Affects Kernel versions >= 99cb0dbd47a15d395bf3faa78dc122bc5efe3fc0, < 5e669d8ab30ab61dec3c36e27b4711f07611e6fc. No fix is published. How to fix ↓
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Background
The Linux Kernel is a critical component of the Linux operating system, responsible for managing system resources and providing an interface between hardware and software. It is widely used in various devices and servers. This vulnerability specifically affects the mm (memory management) subsystem and the thp (transparent huge pages) feature. Transparent huge pages allow the kernel to manage large memory pages efficiently, improving performance. However, a flaw in the collapse_file function can lead to a writeback page being mishandled, potentially resulting in security vulnerabilities.
Vulnerability Detail
The vulnerability arises from a flaw in the collapse_file function within the mm subsystem of the Linux Kernel. When collapsing a file, which involves merging adjacent memory areas, the function fails to handle writeback pages correctly. This flaw could be exploited by an attacker to trigger unexpected behavior, potentially leading to security issues such as privilege escalation or denial of service. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been mentioned for this vulnerability.
Conclusion
The vulnerability in the Linux Kernel's mm subsystem and thp feature has been identified and addressed in version v5.14.16. Users are advised to update their kernel to this version or a later one to mitigate the risk. For further support and assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
The Linux Kernel is a critical component of the Linux operating system, responsible for managing system resources and providing an interface between hardware and software.
The mm (memory management) subsystem is a part of the Linux Kernel that handles memory allocation, deallocation, and management.
Transparent huge pages (thp) is a feature in the Linux Kernel that allows the kernel to manage large memory pages efficiently, improving performance.
The collapse_file function is a part of the mm subsystem in the Linux Kernel. It is responsible for merging adjacent memory areas when collapsing a file.
The vulnerability could potentially be exploited by an attacker to trigger unexpected behavior, which may lead to security issues such as privilege escalation or denial of service.
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