Linux Kernel AMDGPU VCN Poison IRQ Release Skipping Vulnerability

A vulnerability in the Linux kernel's AMDGPU driver for VCN version 2.5 has been addressed. The issue arose because virtual functions (VF) do not activate the VCN poison interrupt, leading to a call trace during the deinitialization process. The vulnerability was present in several different versions of the Linux kernel.

Impact

The vulnerability could cause a call trace during the deinitialization of the VCN hardware, potentially leading to a disruption in normal operations.

Reproduction

The vulnerability can be reproduced by unloading the AMDGPU module on a system running a Linux kernel version that includes this vulnerability. This can be done using the 'rmmod' command. The call trace warning indicates that the VCN poison IRQ release was not properly handled, which is the core of the vulnerability.

Remediation

Users can upgrade to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for downloading the latest kernel version can be found on the official Ubuntu or Linux kernel websites.