Vulnerability in iommu/vt-d: Fix sysfs leak in alloc_iommu()

Kernel Updated 02 Oct 2025

Summary

04/06/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1000643: iommu/vt-d: Fix sysfs leak in alloc_iommu(). Affects Kernel versions >= 39ab9555c24110671f8dc671311a26e5c985b592, < 044bbe8b92ab4e542de7f6c93c88ea65cccd8e29. 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 iommu/vt-d package is a component of the Linux Kernel that provides support for Input-Output Memory Management Units (IOMMUs) and Virtualization Technology for Directed I/O (VT-d). IOMMUs are hardware devices that manage memory access for input-output devices, while VT-d enables direct device assignment to virtual machines. These features enhance security and performance in virtualized environments. However, a vulnerability has been discovered in the alloc_iommu() function of the iommu/vt-d package, which can lead to a sysfs leak.

Vulnerability Detail

The alloc_iommu() function in the iommu/vt-d package suffers from a sysfs leak vulnerability. This vulnerability was introduced in version v4.11 of the Linux Kernel and has been fixed in version v5.4.124. An attacker could exploit this vulnerability to leak sensitive information from the sysfs filesystem, potentially leading to further security breaches. The impact and attack plausibility of this vulnerability have not been proven yet.

How To Fix

No fixed version is published for this vulnerability.

To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.4.124 or later. This fix can be obtained by updating the kernel source code from the official Linux Kernel repository: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/

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

Workaround

No workaround has been provided for this vulnerability.

Conclusion

The iommu/vt-d package in the Linux Kernel is vulnerable to a sysfs leak in the alloc_iommu() function. It is recommended to update the kernel to version v5.4.124 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for Kernel →