Vulnerability in Linux Kernel: mm: don't try to NUMA-migrate COW pages that have other uses
Summary
GSD-2022-1000532: mm: don't try to NUMA-migrate COW pages that have other uses. Affects Kernel versions >= 09854ba94c6aad7886996bfbee2530b3d8a7f4f4, < d187eeb02d18446e5e54ed6bcbf8b47e6551daea. No fix is published. How to fix ↓
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Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for managing system resources, including memory management. One aspect of memory management involves NUMA (Non-Uniform Memory Access) migration, which aims to optimize memory allocation by moving pages between NUMA nodes. However, a vulnerability has been discovered in the Linux Kernel that affects the NUMA-migration of COW (Copy-On-Write) pages with other uses.
Vulnerability Detail
The vulnerability arises from an incorrect attempt to NUMA-migrate COW pages that have other uses. This can lead to potential security risks, although the exact impact and attack plausibility have not been proven. The vulnerability was introduced in Linux Kernel version v5.9 and has been fixed in version v5.16.11. The specific commit that addresses this issue is d187eeb02d18446e5e54ed6bcbf8b47e6551daea. For more technical details, please refer to the provided references.
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
In conclusion, a vulnerability has been identified in the Linux Kernel that involves the incorrect NUMA-migration of COW pages with other uses. It is crucial to update the Linux Kernel to version v5.16.11 or later to mitigate this vulnerability. For further support and assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
The Linux Kernel is an open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for managing system resources.
NUMA migration is a memory management technique in which pages are moved between NUMA nodes to optimize memory allocation.
COW (Copy-On-Write) pages are memory pages that are shared between multiple processes until one of the processes modifies the page. At that point, a copy of the page is created for the modifying process.
The exact impact and attack plausibility of this vulnerability have not been proven. However, it could potentially be exploited to gain unauthorized access or manipulate system memory.
You can use Vulert (https://vulert.com) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in software.
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