Race Condition Vulnerability in Linux Kernel Affecting NFSv4/pNFS
Summary
CVE-2025-38393: In the Linux kernel, the following vulnerability has been resolved: NFSv4/pNFS: Fix a race to wake on NFS_LAYOUT_DRAIN We found a few different systems hung up in writeback waiting on the same page lock, and one task wai... 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 interactions. It is known for its robustness and versatility, supporting a wide range of hardware architectures. However, like any complex software, it is susceptible to vulnerabilities. This specific issue affects the NFSv4/pNFS subsystem, which is responsible for network file system operations, particularly in managing file layouts across distributed systems.
Vulnerability Detail
In the Linux kernel, a race condition was identified in the NFSv4/pNFS implementation, specifically related to the handling of layout updates. This vulnerability can lead to system hangs during writeback operations, as multiple tasks may be waiting on the same page lock while the layout header's outstanding count is incorrectly reported as zero. This situation can severely impact system performance and reliability, especially in environments relying on NFS for file storage and access.
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 are encouraged to monitor their systems for unusual behavior and apply the patch as soon as it becomes available.
Conclusion
The CVE-2025-38393 vulnerability in the Linux kernel poses a significant risk due to a race condition in the NFSv4/pNFS subsystem. Users are strongly advised to update their systems to the patched version to ensure continued reliability and performance. Regular monitoring and prompt application of updates are crucial in maintaining system security.
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FAQ
CVE-2025-38393 is a vulnerability in the Linux kernel related to a race condition in the NFSv4/pNFS subsystem, which can lead to system hangs during file operations.
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.
The vulnerability can cause system hangs and degraded performance, particularly in environments that rely on NFS for file storage and access.
Yes, a patched version of the Linux kernel (6.12.37-1 for Debian 13) is available. Users should update their systems to this version to mitigate the vulnerability.
While there are no specific workarounds, it is essential to monitor your system for unusual behavior and plan to apply the patch as soon as possible.
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