Null-Pointer-Dereference Vulnerability in tty: synclink_gt
Summary
GSD-2022-1004036: tty: synclink_gt: Fix null-pointer-dereference in slgt_clean(). Affects Kernel versions < 50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d. No fix is published. How to fix ↓
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Background
The tty: synclink_gt package is a component of the Linux Kernel, which is responsible for handling serial communication devices. It provides support for SyncLink GT serial adapters. These adapters are commonly used in industrial automation, telecommunications, and other applications that require reliable serial communication. The vulnerability in question is a null-pointer-dereference issue that exists in the slgt_clean() function of the synclink_gt driver.
Vulnerability Detail
The null-pointer-dereference vulnerability in slgt_clean() can be exploited by an attacker to cause a denial-of-service condition or potentially execute arbitrary code with kernel privileges. The vulnerability occurs when the driver attempts to clean up resources but fails to properly handle a null pointer, leading to a crash or potential code execution. This vulnerability has been assigned the ID GSD-2022-1004036 and is fixed in Linux Kernel version v4.9.318 by commit 50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can disable the synclink_gt driver if it is not required for their system. This can be done by blacklisting the driver module or removing it from the kernel configuration. However, this workaround should only be considered temporary, as it may impact the functionality of devices that rely on the synclink_gt driver.
Conclusion
The null-pointer-dereference vulnerability in tty: synclink_gt can lead to a denial-of-service condition or potential code execution with kernel privileges. It is crucial to update the Linux Kernel to version v4.9.318 or later to mitigate this vulnerability. Users can also use the Vulert Playground at https://vulert.com/scanner to check if their system is affected. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a denial-of-service condition or potential code execution with kernel privileges.
You can use the Vulert Playground at Vulert Scanner to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and Vulert will analyze it for any known vulnerabilities.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the necessary updates to mitigate the risk.
An attacker would need local access to a system with the vulnerable version of the Linux Kernel and the synclink_gt driver loaded.
More information about the fix can be found in the commit 50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d in the Linux Kernel repository: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=50c341f9a2adc4c32a8ad5a39eb99d9c4a419e0d
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