xen/x86: Fix PV Trap Handling on Secondary Processors in Linux Kernel
Summary
GSD-2021-1001502: xen/x86: fix PV trap handling on secondary processors. Affects Kernel versions >= f87e4cac4f4e940b328d3deb5b53e642e3881f43, < fda79676ed9a4ca142e60f91234a5e349b3206e5. No fix is published. How to fix ↓
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.
No signup required · Results in about 60 seconds
Background
The Linux Kernel is a critical component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It provides the foundation for various functionalities, including device drivers, process management, and file systems. The Xen hypervisor, which is integrated into the Linux Kernel, enables the virtualization of hardware resources and the creation of virtual machines (VMs). The Xen/x86 subsystem within the Linux Kernel specifically handles the virtualization of x86-based systems.
In the context of this vulnerability, the PV (Paravirtualization) trap handling mechanism on secondary processors within the Xen/x86 subsystem is flawed. This flaw could potentially be exploited by an attacker to execute arbitrary code or escalate privileges on a system running a vulnerable version of the Linux Kernel.
Vulnerability Detail
The vulnerability arises from a flaw in the PV trap handling mechanism on secondary processors within the Xen/x86 subsystem of the Linux Kernel. The specific technical details of the vulnerability have not been provided in the available information. However, it is mentioned that the vulnerability was introduced in version v2.6.23 of the Linux Kernel and fixed in version v4.4.286.
The impact and attack plausibility of this vulnerability have not been proven yet. Further analysis and testing are required to determine the potential ramifications and exploitability of the flaw.
How To Fix
No fixed version is published for this vulnerability.
Tip — Not sure whether your app is affected? Vulert can check the versions your app actually runs. Scan free →
Conclusion
The vulnerability in the Xen/x86 subsystem of the Linux Kernel, specifically related to PV trap handling on secondary processors, poses a potential security risk. To mitigate this vulnerability, it is crucial to update the Linux Kernel to version v4.4.286 or later. This update includes the necessary fix for the flaw. Users should follow the recommended update procedures for their respective distributions. For further assistance or support in addressing this vulnerability, please reach out to DevNack.com.
See every vulnerability recorded for Kernel →
FAQ
The Xen/x86 subsystem is a component of the Linux Kernel that handles the virtualization of x86-based systems. It integrates the Xen hypervisor, allowing for the creation and management of virtual machines.
PV trap handling refers to the mechanism employed in paravirtualized environments to handle exceptions or traps generated by guest operating systems. It ensures proper handling and control flow when a trap occurs.
The specific details of the vulnerability have not been disclosed. However, if successfully exploited, an attacker could potentially execute arbitrary code or escalate privileges on a system running a vulnerable version of the Linux Kernel.
The vulnerability was introduced in version v2.6.23 of the Linux Kernel. Systems running versions prior to v4.4.286 are considered vulnerable.
There is no information available regarding active exploitation of this vulnerability in the wild. However, it is important to apply the recommended updates to mitigate any potential risks.
Related vulnerabilities
Recent vulnerabilities recorded for Kernel.
