Critical Vulnerability in Linux Kernel: NFSv4.2 READ_PLUS Scratch Buffer Double-Free
Summary
CVE-2023-53360: In the Linux kernel, the following vulnerability has been resolved: NFSv4.2: Rework scratch handling for READ_PLUS (again) I found that the read code might send multiple requests using the same nfs_pgio_header, but nfs4_... Affects linux versions < 6.1.55-1. Fixed in 6.1.55-1. 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 management. It is known for its performance, security, and flexibility, making it a popular choice for servers, desktops, and embedded systems. This vulnerability affects the NFSv4.2 protocol within the kernel, which is responsible for network file system operations, particularly in handling read requests.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the NFSv4.2 implementation related to the handling of scratch buffers during READ_PLUS operations. The issue arises when the read code sends multiple requests using the same nfs_pgio_header, leading to a potential double-free of the scratch buffer. This can result in a NULL pointer being set with a non-zero length, causing a system crash (oops) during the decoding of read replies. The vulnerability can compromise system stability and data integrity, particularly when handling specific read requests.
How To Fix
Minimum fixed version
6.1.55-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, no specific workarounds are provided for this vulnerability. The best course of action is to apply the available patches as soon as possible.
Conclusion
The CVE-2023-53360 vulnerability in the Linux kernel poses a significant risk to systems utilizing the NFSv4.2 protocol. Users are strongly advised to update their kernel to the patched versions to mitigate this risk. Regular monitoring for vulnerabilities using tools like Vulert can help maintain system security.
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FAQ
CVE-2023-53360 is a vulnerability in the Linux kernel related to the NFSv4.2 protocol, specifically concerning the handling of scratch buffers during read operations.
This vulnerability can lead to system crashes and instability when handling specific read requests, potentially compromising data integrity.
If you are using an affected version of the Linux kernel (prior to the patched versions), your system may be vulnerable. You can check your system's kernel version using the command 'uname -r'.
You can use tools like Vulert, which monitors and alerts for open-source vulnerabilities in your software using a manifest file like package-lock.json. You can check your application for vulnerabilities without requiring access to the code or installation.
More information can be found in the official CVE database or by visiting the provided source link for CVE-2023-53360.
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