NFSD: Underflow Vulnerability in nfssvc_decode_writeargs()

Kernel Updated 02 Oct 2025

Summary

24/04/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1002139: NFSD: prevent underflow in nfssvc_decode_writeargs(). Affects Kernel versions < 65e21cc042f4c1518c8c55283f53bc725b78419d. No fix is published. How to fix ↓

Free scan

Check if this vulnerability affects your application

Upload a manifest or SBOM and we'll show whether you're affected, plus every other risky package in the same scan.

Check my app free

No signup required · Results in about 60 seconds

Upload your dependency manifest or SBOM

Drag & drop your file here or Browse

Java Javascript PHP Python Go Rust Ruby Dart C/C++ Elixir CycloneDX SPDX

Upload a supported dependency manifest or SBOM. No installation or source-code access required.

See supported files and SBOM formats

SBOM sbom.json · bom.json · bom.xml · *.spdx.json · *.cdx.json · *.cdx.xml

Java pom.xml · gradle.lockfile · buildscript-gradle.lockfile

Javascript package-lock.json · yarn.lock · pnpm-lock.yaml

PHP composer.lock

Python poetry.lock · requirements.txt · Pipfile.lock

Go go.mod

Rust Cargo.lock

Ruby Gemfile.lock

Dart pubspec.lock

C/C++ conan.lock

Elixir mix.lock

Enter your work email to receive your report link.

Verify your email to view the full report and start 30 days of continuous monitoring. No credit card required.

Background

The NFSD (Network File System Daemon) is a component of the Linux Kernel that provides support for the NFS (Network File System) protocol. It allows remote clients to access files and directories on a server over a network. The nfssvc_decode_writeargs() function is responsible for decoding write arguments in NFS requests. However, a vulnerability has been discovered in this function that could lead to underflow.

Vulnerability Detail

The vulnerability in nfssvc_decode_writeargs() arises from a lack of proper input validation. An attacker could exploit this flaw by sending a specially crafted NFS request, causing an underflow condition. This could potentially lead to memory corruption or arbitrary code execution on the affected system. The impact and attack plausibility of this vulnerability have not been proven yet.

How To Fix

No fixed version is published for this vulnerability.

The vulnerability has been fixed in the Linux Kernel version v5.10.110 by commit 65e21cc042f4c1518c8c55283f53bc725b78419d. To fix the vulnerability, it is recommended to update the Linux Kernel to this version or a later one.

Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →

Workaround

No specific workaround has been mentioned for this vulnerability.

Conclusion

The vulnerability in nfssvc_decode_writeargs() could potentially lead to memory corruption or arbitrary code execution. It is crucial to update the Linux Kernel to version v5.10.110 or a later one to mitigate this vulnerability. For further support on vulnerability remediation, you can reach out to DevNack.com.

See every vulnerability recorded for Kernel →