Vulnerability in Kernel: video: fbdev: cirrusfb: check pixclock to avoid divide by zero
Summary
GSD-2022-1001782: video: fbdev: cirrusfb: check pixclock to avoid divide by zero. Affects Kernel versions < 6fe23ff94e7840097202e85c148688940b37c9b1. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system that acts as a bridge between the hardware and software layers. It provides essential functionalities and services to enable the proper functioning of the system. The video subsystem within the Kernel handles video-related operations, including framebuffer devices (fbdev). The cirrusfb driver is responsible for supporting the Cirrus Logic graphics controller. However, a vulnerability has been identified in the cirrusfb driver that can lead to a divide by zero error when the pixclock value is not properly checked.
Vulnerability Detail
The vulnerability in the cirrusfb driver arises from the lack of proper validation of the pixclock value. When this value is not checked, it can result in a divide by zero error. An attacker could potentially exploit this vulnerability to cause a denial-of-service (DoS) condition or execute arbitrary code with kernel privileges. The impact of this vulnerability can vary depending on the attacker's capabilities and the system's configuration. It is crucial to address this vulnerability promptly to prevent potential security breaches.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
If updating the Kernel is not immediately feasible, a temporary workaround can be implemented by disabling the cirrusfb driver or removing the associated hardware. However, this workaround may result in the loss of video functionality for systems relying on the Cirrus Logic graphics controller. It is strongly advised to update the Kernel as soon as possible to address the vulnerability effectively.
Conclusion
In conclusion, a vulnerability has been identified in the cirrusfb driver of the Linux Kernel, which can lead to a divide by zero error when the pixclock value is not properly checked. This vulnerability can potentially result in a denial-of-service (DoS) condition or the execution of arbitrary code with kernel privileges. To mitigate this risk, it is crucial to update the Kernel to version v5.15.33 or later, which includes the necessary fix. If immediate updating is not possible, disabling the cirrusfb driver or removing the associated hardware can serve as a temporary workaround. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability can range from a denial-of-service (DoS) condition to the execution of arbitrary code with kernel privileges. The severity of the impact depends on the attacker's capabilities and the system's configuration.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.15.33 or later. This update includes the necessary validation checks for the pixclock value in the cirrusfb driver.
If updating the Kernel is not immediately feasible, a temporary workaround is to disable the cirrusfb driver or remove the associated hardware. However, this may result in the loss of video functionality for systems relying on the Cirrus Logic graphics controller.
At the time of this report, there are no known instances of this vulnerability being actively exploited. However, it is crucial to address the vulnerability promptly to mitigate potential risks.
More information about the fix for this vulnerability can be found in commit 6fe23ff94e7840097202e85c148688940b37c9b1 of the Linux Kernel repository. It is recommended to refer to the official documentation and release notes for the Linux Kernel for detailed information.
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