Critical Memory Management Vulnerability in Linux Kernel: CVE-2024-57883
Summary
CVE-2024-57883: In the Linux kernel, the following vulnerability has been resolved: mm: hugetlb: independent PMD page table shared count The folio refcount may be increased unexpectly through try_get_folio() by caller such as split_huge... Affects linux versions 5.10.103-1 – 6.9.9-1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing essential services for hardware and software interaction. It manages system resources, including memory, processes, and device drivers. The kernel's memory management subsystem is responsible for handling memory allocation and deallocation, ensuring efficient use of system resources. However, vulnerabilities in this subsystem can lead to serious security issues, such as memory leaks or unauthorized access to sensitive data. CVE-2024-57883 specifically affects the handling of HugeTLB pages, which are used for managing large memory pages in high-performance applications.
Vulnerability Detail
CVE-2024-57883 is a vulnerability in the Linux kernel's memory management system, specifically related to the handling of HugeTLB pages. The issue arises from an incorrect reference count check in the huge_pmd_unshare() function, which can lead to a page table leak. When the reference count is unexpectedly increased by functions like split_huge_pages, the kernel may treat a page table as shared when it is not, preventing proper memory deallocation. This can result in memory leaks and potentially allow unauthorized access to memory regions, leading to system instability and security risks. The vulnerability can be triggered by various kernel features, including damon, offline_page, and page_idle, which manipulate page table reference counts.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the patch as soon as it becomes available.
Conclusion
CVE-2024-57883 is a critical vulnerability in the Linux kernel that affects memory management, particularly with HugeTLB pages. Users are advised to update their kernel to the latest patched version to protect against potential memory leaks and unauthorized access. Utilizing tools like Vulert can help monitor and identify vulnerabilities in your software effectively.
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FAQ
CVE-2024-57883 is a vulnerability in the Linux kernel that affects memory management, specifically the handling of HugeTLB pages, leading to potential memory leaks.
You can use Vulert, which monitors open-source vulnerabilities in your software. By uploading your manifest file, such as package-lock.json, you can check for vulnerabilities without needing to install anything.
The risks include memory leaks, system instability, and potential unauthorized access to sensitive memory regions, which could compromise system security.
Yes, a patch has been developed and users are encouraged to update their Linux kernel to the latest version that includes the fix for CVE-2024-57883.
While there are no specific workarounds available, it is crucial to prioritize updating your kernel as soon as possible to mitigate the risks associated with this vulnerability.
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