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-2022-1003885: um: Fix out-of-bounds read in LDT setup. Affects Kernel versions >= 858259cf7d1c443c836a2022b78cb281f0a9b95e, < 3549ab4b962cf619e8c55484a0d870a34b3f845f. No fix is published. How to fix ↓

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Background

The um package is a component of the Linux Kernel, which is responsible for providing user-mode Linux functionality. It allows users to run multiple instances of Linux as user-space processes on a single host. The um package includes various features and modules that enable the execution of Linux in a virtualized environment. However, a vulnerability has been discovered in the um package that can lead to an out-of-bounds read during the setup of the Local Descriptor Table (LDT).

Vulnerability Detail

The vulnerability in the um package occurs during the setup of the LDT, where an out-of-bounds read can be triggered. This can potentially result in the disclosure of sensitive information or the execution of arbitrary code. The issue was introduced in version v2.6.15 of the Linux Kernel and has been present until version v4.19.247. The impact and attack plausibility of this vulnerability have not been proven yet.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

There is no specific workaround mentioned for this vulnerability. It is recommended to apply the fix by updating the Linux Kernel to the latest version.

Conclusion

In conclusion, the um package in the Linux Kernel is vulnerable to an out-of-bounds read during the setup of the LDT. To mitigate this vulnerability, it is crucial to update the Linux Kernel to version v4.19.247 or later. For further support and assistance in vulnerability remediation, please contact DevNack.com.

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