PCI: aardvark: Fix kernel panic during PIO transfer in Kernel
Summary
GSD-2021-1000930: PCI: aardvark: Fix kernel panic during PIO transfer. Affects Kernel versions < 4c90f90a91d75c3c73dd633827c90e8746d9f54d. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages communication between hardware and software. It provides essential functions and services to enable the proper functioning of the system. The PCI (Peripheral Component Interconnect) subsystem in the Kernel handles communication with PCI devices, allowing data transfer and control operations. The aardvark driver within the PCI subsystem is responsible for managing PIO (Programmed Input/Output) transfers. PIO transfers involve direct communication between the CPU and a PCI device without the use of DMA (Direct Memory Access). This vulnerability in the aardvark driver can lead to a kernel panic during PIO transfer operations.
Vulnerability Detail
The vulnerability in the aardvark driver of the Kernel can result in a kernel panic when performing PIO transfers. A kernel panic is a critical error condition where the operating system cannot safely continue its execution. This vulnerability can be triggered during data transfer operations between the CPU and a PCI device using PIO. The exact cause and impact of the kernel panic are not yet proven, but it poses a risk of system instability, data corruption, and potential denial-of-service. The vulnerability has been addressed in the Linux Kernel version v5.4.128 by commit 4c90f90a91d75c3c73dd633827c90e8746d9f54d.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been provided for this vulnerability. It is advised to apply the fix mentioned in the 'how_to_fix' section to ensure the security and stability of the system.
Conclusion
The vulnerability in the aardvark driver of the Kernel can lead to a kernel panic during PIO transfers, potentially causing system instability and denial-of-service. It is crucial to update the Linux Kernel to version v5.4.128 or later to address this vulnerability. Users can obtain the updated Kernel source code from the official Git repository or wait for their Linux distribution to provide an updated package. For further support and assistance with vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a kernel panic, causing system instability, potential data corruption, and denial-of-service.
You can use the Vulert playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will provide real-time monitoring and alerts for open-source vulnerabilities.
At the time of this report, no known exploit has been disclosed for this vulnerability. However, it is crucial to apply the fix to mitigate any potential risks.
The exact attack vectors and exploitability of this vulnerability have not been proven. However, as it affects the Kernel, which is a core component of the operating system, remote exploitation cannot be entirely ruled out.
The recommended solution is to update the Linux Kernel to the fixed version. However, if updating is not feasible, implementing additional security measures, such as network segmentation and access controls, can help mitigate the potential impact of this vulnerability.
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