KVM: x86: Mark TSS busy during LTR emulation _after_ all fault checks

Kernel Updated 02 Oct 2025

Summary

17/09/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1005919: KVM: x86: Mark TSS busy during LTR emulation _after_ all fault checks. Affects Kernel versions >= e37a75a13cdae5deaa2ea2cbf8d55b5dd08638b6, < 68ba319b88889b76e0afcb83ee3f9a07d2ae5f1b. 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 Kernel package is a critical component of the Linux operating system. It provides the core functionality and interfaces for the system's hardware and software components. KVM (Kernel-based Virtual Machine) is a module within the Kernel that enables virtualization on x86-based systems. It allows multiple virtual machines to run concurrently on a single physical machine. The TSS (Task State Segment) is a data structure used by the processor to manage task switching and context switching in the x86 architecture.

Vulnerability Detail

The vulnerability in KVM's x86 implementation allows an attacker to bypass certain fault checks during LTR (Load Task Register) emulation. By exploiting this vulnerability, an attacker could potentially gain unauthorized access to sensitive information or execute arbitrary code within a virtual machine. The vulnerability was introduced in version v3.17 of the Linux Kernel and has been fixed in version v5.10.137.

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 v5.10.137 or later. This can be done by downloading the latest stable version of the Kernel from the official Git repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and following the installation instructions provided.

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

Workaround

There is no known workaround for this vulnerability.

Conclusion

The vulnerability in KVM's x86 implementation could allow an attacker to bypass fault checks during LTR emulation, potentially leading to unauthorized access or arbitrary code execution within a virtual machine. It is crucial to update the Linux Kernel to version v5.10.137 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for Kernel →