Critical Vulnerability in Linux Kernel: Early Initialization of nfsd_info.mutex
Summary
DEBIAN-CVE-2024-42078: In the Linux kernel, the following vulnerability has been resolved: nfsd: initialise nfsd_info.mutex early. Affects linux versions < 6.9.8-1. Fixed in 6.9.8-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, providing the essential interface between hardware and software. It is responsible for managing system resources, enabling hardware communication, and ensuring system stability. The kernel is widely used across various distributions, including Debian. This vulnerability specifically affects the nfsd (Network File System daemon), which allows file sharing over a network. The issue arises from improper initialization of the nfsd_info.mutex, which can lead to system instability.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified where the nfsd_info.mutex is not initialized early enough. This can lead to a situation where the mutex is dereferenced by the svc_pool_stats_start() function immediately after a new network namespace is created, potentially triggering a system crash (oops). This vulnerability can compromise system reliability and may be exploited in environments where NFS is used extensively.
How To Fix
Minimum fixed version
6.9.8-1
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 advisable to apply the patch as soon as it is available to mitigate potential risks.
Conclusion
The vulnerability in the Linux kernel regarding the early initialization of nfsd_info.mutex poses a significant risk to system stability, particularly for NFS services. It is essential to apply the available patch promptly to mitigate the risks associated with this issue.
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FAQ
The vulnerability can lead to system crashes, affecting the stability of applications that rely on the NFS service.
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.
Yes, a patch is available in version 6.9.8-1 for both Debian 13 and 14.
While there are no specific workarounds, it is crucial to plan for an update as soon as possible to avoid potential system instability.
Detailed information can be found in the Debian CVE database or through security advisories related to the Linux kernel.
References
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