Out-of-bounds read vulnerability in um package
Summary
GSD-2022-1003305: um: Fix out-of-bounds read in LDT setup. Affects Kernel versions >= 858259cf7d1c443c836a2022b78cb281f0a9b95e, < 10995a382271254bd276627ec74136da4a23c4a6. 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 a virtual machine that runs on top of the host operating system. It allows users to run different Linux distributions within a single host environment. The um package utilizes the LDT (Local Descriptor Table) setup for managing memory and segment descriptors. This vulnerability affects the um package and can lead to an out-of-bounds read during the LDT setup process.
Vulnerability Detail
The vulnerability in the um package arises from an out-of-bounds read in the LDT setup. An attacker could exploit this vulnerability to read sensitive information from kernel memory or cause a denial-of-service condition. The vulnerability was introduced in version v2.6.15 of the Linux Kernel and has been fixed in version v5.15.46. 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.
Conclusion
The um package in the Linux Kernel is vulnerable to an out-of-bounds read in the LDT setup. To mitigate this vulnerability, it is crucial to update the Linux Kernel to version v5.15.46 or later. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The um package is a component of the Linux Kernel that provides a virtual machine environment for running different Linux distributions within a single host operating system.
LDT (Local Descriptor Table) setup is a mechanism used by the um package to manage memory and segment descriptors.
An out-of-bounds read vulnerability occurs when a program accesses memory outside the bounds of a defined buffer, potentially leading to the exposure of sensitive information or a denial-of-service condition.
This vulnerability can be exploited by an attacker to read sensitive information from kernel memory or cause a denial-of-service condition.
Yes, this vulnerability has been fixed in Linux Kernel version v5.15.46.
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