NFSv4: NULL pointer dereference in pnfs_mark_matching_lsegs_return()
Summary
UVI-2021-1000644: NFSv4: Fix a NULL pointer dereference in pnfs_mark_matching_lsegs_return(). Affects Kernel versions >= 6be0e4b59314e4a836495f6ffdc5d2c5b079deeb, < aba3c7795f51717ae316f3566442dee7cc3eeccb. No fix is published. How to fix ↓
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Background
The Kernel package is a fundamental component of the Linux operating system. It provides the core functionality and interfaces for the system's hardware and software components. The NFSv4 (Network File System version 4) is a protocol within the Kernel package that allows remote file access and sharing. It includes support for parallel NFS (pNFS) which improves performance by allowing data to be accessed in parallel from multiple servers. However, a vulnerability has been discovered in the pnfs_mark_matching_lsegs_return() function of NFSv4, which can lead to a NULL pointer dereference.
Vulnerability Detail
The vulnerability in pnfs_mark_matching_lsegs_return() function of NFSv4 occurs when a NULL pointer is dereferenced, causing the system to crash or potentially leading to arbitrary code execution. An attacker could exploit this vulnerability by sending a specially crafted request to a vulnerable system. The impact of this vulnerability includes denial of service (system crash) and potential privilege escalation if code execution is achieved. The vulnerability was introduced in Linux Kernel version v5.4.118 and has been fixed in version v5.4.124.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is recommended to apply the fix mentioned in the 'how_to_fix' section.
Conclusion
In conclusion, the NFSv4 vulnerability in the pnfs_mark_matching_lsegs_return() function of the Kernel package can lead to system crashes and potential privilege escalation. It is crucial to update the Linux Kernel to version v5.4.124 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The impact includes system crashes (denial of service) and potential privilege escalation if code execution is achieved.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and the playground will analyze it for vulnerabilities.
Yes, this vulnerability can be exploited remotely by sending a specially crafted request to a vulnerable system.
No, there is no known workaround. It is recommended to apply the fix mentioned in the 'how_to_fix' section.
The vulnerability was introduced in version v5.4.118 and fixed in version v5.4.124 of the Linux Kernel.
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