Vulnerability in Kernel: Out-of-Bound Vmalloc Access in Imageblit
Summary
GSD-2021-1001661: tty: Fix out-of-bound vmalloc access in imageblit. Affects Kernel versions < d570c48dd37dbe8fc6875d4461d01a9554ae2560. 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 such as process management, memory management, and device drivers. The vulnerability in question affects the Kernel's tty subsystem, which is responsible for handling terminal input and output. The vulnerability allows for out-of-bound vmalloc access in the imageblit function, potentially leading to security breaches and system instability.
Vulnerability Detail
The vulnerability arises from a flaw in the imageblit function within the tty subsystem of the Kernel. It allows an attacker to access memory beyond the allocated buffer, potentially leading to information disclosure or privilege escalation. The impact and attack plausibility of this vulnerability have not been proven yet. However, it is crucial to address this issue promptly to ensure the security and stability of the system. The vulnerability has been fixed in Linux Kernel version v5.10.71 by commit d570c48dd37dbe8fc6875d4461d01a9554ae2560.
How To Fix
No fixed version is published for this vulnerability.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.10.71 or later. This can be done by obtaining the updated Kernel source code from the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and following the instructions provided for building and installing the Kernel. Alternatively, users can wait for their Linux distribution to release an updated package containing the fixed Kernel version.
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Conclusion
In conclusion, the vulnerability in the Kernel's tty subsystem poses a potential risk of out-of-bound vmalloc access in the imageblit function. It is crucial to update the Linux Kernel to version v5.10.71 or later to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability could potentially include information disclosure or privilege escalation, leading to unauthorized access or control over the affected system.
There is no evidence of this vulnerability being exploited in the wild at the time of discovery. However, it is crucial to apply the necessary fixes to mitigate any potential risks.
The vulnerability is present in versions of the Linux Kernel prior to v5.10.71. It has been addressed and fixed in the mentioned version and subsequent releases.
At the moment, there is no known workaround for this vulnerability. It is recommended to update to the fixed version of the Linux Kernel as soon as possible.
For more details about this vulnerability, including the technical aspects and the fix, you can refer to the source provided by the Cloud Security Alliance's GSD database: https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/GSD-2021-1001661.json
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