Kernel Module Insertion Warning in Linux Kernel due to virtiofs Memory Allocation Issue
Summary
CVE-2024-53219: In the Linux kernel, the following vulnerability has been resolved: virtiofs: use pages instead of pointer for kernel direct IO When trying to insert a 10MB kernel module kept in a virtio-fs with cache disabled, the foll... 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 supports various functionalities, including process management, memory management, and device control. The vulnerability in question arises from the virtio-fs, a filesystem that allows sharing files between host and guest systems in virtualized environments. This vulnerability specifically affects the handling of large kernel module insertions, leading to potential system hangs and resource allocation failures.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the virtio-fs implementation related to memory allocation during kernel module insertion. When attempting to insert a large kernel module (10MB) with cache disabled, a warning is triggered due to excessive memory allocation requests. The issue originates from the way virtio-fs handles direct I/O operations, leading to an infinite hang during the finit_module() syscall. The root cause is the allocation of a large buffer that exceeds the maximum page order, causing kmalloc() to fail and the module insertion process to stall indefinitely.
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. However, users can avoid inserting large kernel modules while using virtio-fs with cache disabled to prevent triggering the warning.
Conclusion
The vulnerability CVE-2024-53219 in the Linux kernel highlights a critical issue in the virtio-fs implementation that can lead to system hangs during kernel module insertion. Users are advised to update their systems to the latest patched versions to mitigate this risk. Additionally, utilizing tools like Vulert can aid in monitoring and managing open-source vulnerabilities effectively.
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FAQ
The vulnerability can cause the kernel module insertion process to hang indefinitely, potentially leading to system instability.
You can use Vulert, which monitors open-source vulnerabilities in your software. By uploading your manifest file like package-lock.json, you can check for vulnerabilities in real-time.
While there are no specific workarounds, avoiding the insertion of large kernel modules with cache disabled can help prevent the issue.
All versions of the Linux kernel prior to the fixed version 6.12.3-1 for Debian 13 are affected.
Vulert uses a manifest file to monitor and alert users in real-time for open-source vulnerabilities, ensuring that developers are aware of potential risks without needing to access the code directly.
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