Divide by Zero Vulnerability in Linux Kernel
Summary
GSD-2022-1002420: video: fbdev: cirrusfb: check pixclock to avoid divide by zero. Affects Kernel versions < 1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135. No fix is published. How to fix ↓
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Background
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The vulnerability in question affects the video subsystem of the Linux Kernel, specifically the cirrusfb driver used for handling the Cirrus Logic graphics controller. This driver is responsible for managing frame buffer devices and providing support for graphical output on systems utilizing Cirrus Logic graphics hardware.
Vulnerability Detail
The identified vulnerability in the cirrusfb driver arises from a failure to check the value of the 'pixclock' parameter, which can result in a divide by zero error. An attacker could potentially exploit this vulnerability by supplying a crafted input that triggers the divide by zero condition, leading to a system crash or potentially allowing for the execution of arbitrary code. The impact and attack plausibility of this vulnerability have not been proven yet, but it is crucial to address it to ensure the stability and security of affected systems.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As there is a fix available in the updated Linux Kernel, it is recommended to apply the patch rather than relying on workarounds. However, if immediate patching is not feasible, a temporary workaround could involve disabling the cirrusfb driver or removing the affected hardware from the system. This can be achieved by blacklisting the 'cirrusfb' module or modifying the kernel configuration to exclude support for Cirrus Logic graphics hardware. It is important to note that workarounds may have limitations and should only be considered as temporary measures until the patch can be applied.
Conclusion
The identified divide by zero vulnerability in the cirrusfb driver of the Linux Kernel poses a potential risk to affected systems. It is crucial to promptly update the Linux Kernel to version v4.14.276 or later, which includes the necessary fix. Users should follow standard procedures for kernel updates, ensuring proper testing and validation. If you require further assistance or support in addressing this vulnerability, please contact DevNack.com.
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FAQ
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software.
The cirrusfb driver is a component of the Linux Kernel's video subsystem, specifically designed for handling the Cirrus Logic graphics controller. It provides support for frame buffer devices and enables graphical output on systems utilizing Cirrus Logic graphics hardware.
The impact of this vulnerability is not yet proven, but it could potentially lead to a system crash or allow for the execution of arbitrary code. Addressing the vulnerability is crucial to ensure the stability and security of affected systems.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v4.14.276 or later, which includes the necessary fix. Users can obtain the updated kernel from the official Linux Kernel repository and follow standard procedures for kernel updates.
While it is recommended to apply the patch provided in the updated Linux Kernel, a temporary workaround involves disabling the cirrusfb driver or removing the affected hardware from the system. However, workarounds should only be considered as temporary measures until the patch can be applied.
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