Critical Vulnerability in Linux Kernel: NFS Compound Request Handling Flaw
Summary
CVE-2025-38430: In the Linux kernel, the following vulnerability has been resolved: nfsd: nfsd4_spo_must_allow() must check this is a v4 compound request If the request being processed is not a v4 compound request, then examining the cs... 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 is known for its stability, performance, and security features. However, like any complex software, it is susceptible to vulnerabilities that can compromise system integrity. This specific vulnerability affects the NFS (Network File System) daemon, which is responsible for handling file sharing over a network. The flaw arises in the handling of v4 compound requests, which can lead to undefined behavior if not properly checked.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the NFS daemon (nfsd) related to the handling of v4 compound requests. The function nfsd4_spo_must_allow() fails to verify whether the request being processed is indeed a v4 compound request. This oversight can result in undefined behavior when examining the cstate, potentially leading to system crashes or unauthorized access to resources. The vulnerability is critical as it can be exploited by attackers to disrupt services or gain unauthorized access to sensitive data.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, no specific workarounds have been provided for this vulnerability. The best course of action is to apply the available patches as soon as they are released.
Conclusion
The vulnerability CVE-2025-38430 in the Linux kernel poses significant risks related to NFS compound request handling. It is essential for users to stay informed about this issue and apply the necessary patches to maintain system security. Utilizing tools like Vulert can help in monitoring vulnerabilities effectively.
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FAQ
CVE-2025-38430 is a vulnerability in the Linux kernel's NFS daemon that affects the handling of v4 compound requests, potentially leading to undefined behavior.
Exploitation of this vulnerability can lead to system crashes, unauthorized access to files, or disruption of network services.
Yes, a patch is available for Debian 13 in version 6.12.35-1. Users of Debian 11 and 12 should check for the latest updates.
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.
While no specific workarounds are available, it is crucial to prioritize applying the patch as soon as possible to mitigate risks.
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