Vulnerability in Kernel: tty_buffer Softlockup Issue in flush_to_ldisc
Summary
UVI-2021-1002267: tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc. Affects Kernel versions < d491c84df5c469dd9621863b6a770b3428137063. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system, responsible for managing system resources and facilitating communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The vulnerability in the Kernel's tty_buffer module can lead to a softlockup issue in the flush_to_ldisc function. This function is responsible for flushing data from the line discipline buffer to the device driver. The vulnerability can potentially result in system instability and denial-of-service (DoS) conditions.
Vulnerability Detail
The vulnerability arises from a flaw in the tty_buffer module of the Kernel. When flushing data to the line discipline, a softlockup can occur due to improper handling of certain conditions. This can lead to a situation where the system becomes unresponsive or experiences significant delays. An attacker could potentially exploit this vulnerability to cause a DoS attack by repeatedly triggering the softlockup condition. The vulnerability has been addressed in Linux Kernel version v5.4.162 through commit d491c84df5c469dd9621863b6a770b3428137063.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround available for this vulnerability. It is essential to apply the patch or update the Kernel to the fixed version as soon as possible.
Conclusion
The vulnerability in the Kernel's tty_buffer module can lead to a softlockup issue, potentially causing system instability and denial-of-service conditions. It is crucial to update the Linux Kernel to version v5.4.162 or later to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can result in system instability and denial-of-service (DoS) conditions. An attacker could potentially exploit this vulnerability to cause a DoS attack by triggering the softlockup condition.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file to the playground, and it will analyze and alert you if the vulnerability is present.
As of now, there is no known exploit for this vulnerability. However, it is crucial to apply the patch or update the Kernel to mitigate the risk.
No, this vulnerability cannot be remotely exploited. An attacker would require local access to the system to trigger the softlockup condition.
If you cannot immediately update the Kernel, it is recommended to implement strict access controls and limit local access to the system. This can help reduce the risk of exploitation.
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