Vulnerability in Kernel: Out-of-Bound Vmalloc Access in Imageblit
Summary
GSD-2021-1001518: tty: Fix out-of-bound vmalloc access in imageblit. Affects Kernel versions < 70aed03b1d5a5df974f456cdc8eedb213c94bb8b. 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 a bridge between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the overall stability and security of the system. This vulnerability specifically affects the Kernel's tty subsystem, which is responsible for handling input and output devices, such as terminals and serial ports. The vulnerability allows for out-of-bound vmalloc access in the imageblit function, potentially leading to unauthorized access, information disclosure, or system crashes.
Vulnerability Detail
The vulnerability arises from a flaw in the imageblit function within the tty subsystem of the Kernel. By exploiting this flaw, an attacker could trigger an out-of-bound vmalloc access, potentially leading to memory corruption or disclosure of sensitive information. The impact of this vulnerability can vary depending on the attacker's intent and the specific context in which the Kernel is deployed. Successful exploitation could result in privilege escalation, arbitrary code execution, or denial of service. It is important to note that the actual impact and attack plausibility have not yet been proven.
How To Fix
No fixed version is published for this vulnerability.
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Conclusion
The vulnerability in the Kernel's tty subsystem, allowing for out-of-bound vmalloc access in the imageblit function, has been addressed in the Linux Kernel version v4.9.285. Users are strongly advised to update their Kernel to this version or a subsequent release that includes the fix to mitigate potential risks. For further support and assistance regarding vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The impact of this vulnerability can vary depending on the attacker's intent and the specific context in which the Kernel is deployed. Successful exploitation could result in privilege escalation, arbitrary code execution, or denial of service.
No, the actual impact and attack plausibility have not yet been proven. However, it is crucial to address the vulnerability to mitigate potential risks.
To fix the vulnerability, users are advised to update their Kernel to version v4.9.285 or a subsequent release that includes the fix. Follow the official documentation and guidelines provided by the Linux Kernel development team for a secure update process.
No specific workaround has been mentioned for this vulnerability. It is recommended to apply the official fix provided by the Linux Kernel development team.
For more information about this vulnerability, you can refer to the source link provided in the vulnerability details section of the Open Source Vulnerability database.
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