NFS: Corruption of pg_bytes_written in nfs_do_recoalesce()
Summary
GSD-2021-1000557: NFS: Don't corrupt the value of pg_bytes_written in nfs_do_recoalesce(). Affects Kernel versions >= a7d42ddb3099727f58366fa006f850a219cce6c8, < 2fe1cac336b55a1f79e603e9ce3552c3623e90eb. No fix is published. How to fix ↓
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Background
The Kernel package is a crucial component of the Linux operating system. It provides the core functionality and acts as an interface between the hardware and software layers. The NFS (Network File System) is a distributed file system protocol that allows remote file access over a network. It is implemented within the Kernel package and is widely used for sharing files between systems. However, a vulnerability has been identified in the NFS module that can lead to corruption of the 'pg_bytes_written' value in the 'nfs_do_recoalesce()' function.
Vulnerability Detail
The vulnerability originates from a flaw in the 'nfs_do_recoalesce()' function within the NFS module. When certain conditions are met, this function can corrupt the value of 'pg_bytes_written', which represents the number of bytes written to a page. This corruption can have various consequences, such as data integrity issues, incorrect accounting of written bytes, and potential crashes or system instability. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
The NFS module within the Kernel package is vulnerable to corruption of the 'pg_bytes_written' value in the 'nfs_do_recoalesce()' function. This vulnerability has been fixed in Linux Kernel version v5.12.9. Users are advised to update their Kernel package to this version or a subsequent version that includes the fix. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The NFS (Network File System) module is a component within the Kernel package that enables remote file access over a network. It allows systems to share files and directories as if they were local.
'pg_bytes_written' is a value that represents the number of bytes written to a page. It is used for accounting purposes and tracking the amount of data written.
The vulnerability can lead to data integrity issues, incorrect accounting of written bytes, and potential crashes or system instability.
There is no evidence of this vulnerability being exploited in the wild. However, it is important to apply the fix to ensure system security.
To update your Kernel package, you can follow the instructions provided by your Linux distribution or consult the official documentation for the specific steps.
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