Out-of-Bounds Read Vulnerability in um Package

Kernel Updated 02 Oct 2025

Summary

28/06/2022

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2022-1003550: um: Fix out-of-bounds read in LDT setup. Affects Kernel versions >= 858259cf7d1c443c836a2022b78cb281f0a9b95e, < cf0dabc37446c5ee538ae7b4c467ab0e53fa5463. 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 um package is a component of the Linux Kernel, which is responsible for providing a virtual machine environment. It allows users to run multiple instances of Linux on a single physical machine. The um package utilizes the LDT (Local Descriptor Table) setup for managing memory segments within the virtual machine. However, a vulnerability has been discovered in the um package that leads to an out-of-bounds read during the LDT setup process.

Vulnerability Detail

The out-of-bounds read vulnerability in the um package occurs when setting up the LDT. An attacker could exploit this vulnerability to read memory outside the intended boundaries, potentially leading to the disclosure of sensitive information or the execution of arbitrary code. The vulnerability was introduced in version v2.6.15 of the Linux Kernel and has been fixed in version v5.10.121. 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 v5.10.121 or later. This update includes the necessary patch to address the out-of-bounds read issue in the um package.

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. It is essential to apply the provided fix by updating the Linux Kernel to the recommended version.

Conclusion

The out-of-bounds read vulnerability in the um package of the Linux Kernel can be mitigated by updating to version v5.10.121 or later. It is crucial to apply this fix to prevent potential information disclosure or arbitrary code execution. For further support on vulnerability remediation, please contact DevNack.com.

See every vulnerability recorded for Kernel →