Vulnerability in Kernel - tty: Fix out-of-bound vmalloc access in imageblit
Summary
GSD-2021-1001739: tty: Fix out-of-bound vmalloc access in imageblit. Affects Kernel versions < 699d926585daa6ec44be556cdc1ab89e5d54557b. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and acts as an interface between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the stability and security of the system. The tty subsystem within the Kernel handles input and output operations for character-based devices, such as terminals and serial ports. The vulnerability identified in this report relates to the tty subsystem's imageblit function, which is responsible for copying image data to the terminal screen.
The vulnerability arises from an out-of-bound vmalloc access issue, which occurs when the imageblit function attempts to access memory beyond the allocated boundaries. This can lead to memory corruption, crashes, or potential exploitation by malicious actors.
Vulnerability Detail
The vulnerability in the Kernel's tty subsystem allows for out-of-bound vmalloc access in the imageblit function. This can be exploited by an attacker to corrupt memory or potentially execute arbitrary code with elevated privileges. The issue has been addressed in the Linux Kernel version v5.14.10 by commit 699d926585daa6ec44be556cdc1ab89e5d54557b. It is crucial to update to this version or a later one to mitigate the vulnerability.
The vulnerability's impact and attack plausibility have not been proven yet, but it is essential to address it proactively to ensure system security.
How To Fix
No fixed version is published for this vulnerability.
To fix the vulnerability, it is recommended to update the Linux Kernel to version v5.14.10 or a later release. This can be done by following the official update process provided by the Linux distribution being used. It is crucial to ensure that the updated Kernel version is compatible with the specific hardware and software environment to avoid any compatibility issues or regressions.
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Conclusion
The vulnerability in the Kernel's tty subsystem, allowing for out-of-bound vmalloc access in the imageblit function, poses a potential risk of memory corruption and potential exploitation. It is crucial to update the Linux Kernel to version v5.14.10 or a later release to mitigate this vulnerability. Regularly monitoring for open-source vulnerabilities using tools like Vulert Playground can help ensure the security of your system. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The vulnerability allows for out-of-bound vmalloc access in the Kernel's tty subsystem, which can lead to memory corruption, crashes, or potential exploitation by attackers.
There is no evidence of this vulnerability being exploited in the wild at the time of this report. However, it is crucial to address it proactively to mitigate potential risks.
You can use tools like Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert Playground allows you to analyze your application's manifest file, such as package-lock.json, and provides real-time alerts for open-source vulnerabilities.
At the time of this report, no specific workarounds have been identified for this vulnerability. It is recommended to update the Linux Kernel to the fixed version as soon as possible.
You can refer to the vulnerability details in the Open Source Vulnerability format provided by the Cloud Security Alliance's GSD database. The details include the vulnerability ID, affected package, fix commit, and relevant references.
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