fbmem: Do not delete the mode that is still in use (UVI-2021-1001211)
Summary
UVI-2021-1001211: fbmem: Do not delete the mode that is still in use. Affects Kernel versions >= 13ff178ccd6d3b8074c542a911300b79c4eec255, < d6e76469157d8f240e5dec6f8411aa8d306b1126. No fix is published. How to fix ↓
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Background
The Kernel package is a crucial component of the Linux operating system. It provides the core functionality and interfaces for the system's hardware and software components. The fbmem module within the Kernel is responsible for managing the framebuffer memory, which is used for graphical display purposes. This vulnerability in the fbmem module allows for the deletion of a mode that is still in use, leading to potential system instability and security risks.
Vulnerability Detail
The vulnerability arises from the improper handling of mode deletion in the fbmem module. When attempting to delete a mode that is still in use, the module fails to properly validate and handle this scenario. As a result, the system may encounter unexpected behavior, including crashes or security vulnerabilities. This vulnerability was introduced in version v5.3 of the Linux Kernel and has been fixed in version v5.13.4.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can avoid triggering the vulnerability by refraining from deleting modes that are still in use. It is important to carefully manage and validate mode deletion operations to prevent any unintended consequences. Here is an example of how to check if a mode is in use before attempting to delete it:
if (mode_in_use()) {
// Do not delete the mode
} else {
// Proceed with mode deletion
}
Conclusion
The fbmem module in the Kernel is susceptible to a vulnerability that allows for the deletion of a mode that is still in use. This can lead to system instability and potential security risks. It is crucial to update the Linux Kernel to version v5.13.4 or later to mitigate this vulnerability. Users can refer to the provided links and resources for further information and assistance in resolving this issue. For additional support on vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability can lead to system instability and potential security risks. It may result in crashes or provide an avenue for attackers to exploit the system.
You can check the version of the Linux Kernel installed on your system. If it is version v5.3 or later and below v5.13.4, your system may be affected.
At the time of this report, no known exploits have been identified. However, it is important to promptly update the Kernel to mitigate any potential risks.
It is highly recommended to update the Kernel to the fixed version rather than attempting manual patching. The official Kernel update includes comprehensive fixes and ensures the proper resolution of the vulnerability.
You can refer to the official vulnerability report in the GSD Database maintained by the Cloud Security Alliance: https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/UVI-2021-1001211.json
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