Critical Vulnerability in Linux Kernel: nfsd Proc Registration Failure
Summary
DEBIAN-CVE-2025-22026: In the Linux kernel, the following vulnerability has been resolved: nfsd: don't ignore the return code of svc_proc_register() Currently, nfsd_proc_stat_init() ignores the return value of svc_proc_register(). Affects linux versions < 6.12.25-1. Fixed in 6.12.25-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It provides essential services such as process management, memory management, and device control. The kernel is modular, allowing for various functionalities to be added or removed as needed. This vulnerability specifically affects the nfsd (Network File System daemon) component, which enables file sharing over a network. The issue arises from the improper handling of return codes during the registration of proc files, potentially leading to system instability.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified where the nfsd_proc_stat_init() function fails to properly handle the return value of svc_proc_register(). This oversight can lead to warnings when the kernel attempts to remove a proc file entry that was never successfully created. The svc_proc_register() function can fail due to issues such as inability to allocate a dentry or the existence of an identical dentry. If this failure occurs, it can result in memory allocation errors, impacting the stability and reliability of the nfsd service.
How To Fix
Minimum fixed version
6.12.25-1
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, there are no specific workarounds mentioned for this vulnerability. It is recommended to apply the patch as soon as it is available to avoid potential issues.
Conclusion
The identified vulnerability in the Linux kernel's nfsd component highlights the importance of proper error handling in system processes. Users are urged to update their systems to the patched version to maintain stability and security. Utilizing tools like Vulert can further enhance monitoring for vulnerabilities in open-source software.
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FAQ
The vulnerability involves the improper handling of return codes in the nfsd component of the Linux kernel, which can lead to system warnings and instability.
You can use tools like Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
Failure to address this vulnerability may lead to system warnings and potential instability in the nfsd service, impacting file sharing capabilities.
While the vulnerability primarily affects system stability, it is advisable to apply the patch to prevent any unforeseen issues that could arise.
It is recommended to regularly check for updates and patches for your software packages to ensure you are protected against known vulnerabilities.
References
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