Vulnerability in Kernel: tty_buffer Softlockup Issue in flush_to_ldisc
Summary
UVI-2021-1002220: tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc. Affects Kernel versions < 0380f643f3a7a61b0845cdc738959c2ad5735d61. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages communication between hardware and software. It provides essential functions and services for the system's operation. The tty_buffer is a data structure used by the Kernel to handle input and output operations for terminal devices. It stores data received from the terminal and buffers data to be sent to the terminal. However, a vulnerability has been discovered in the tty_buffer implementation that can lead to a softlockup issue in the flush_to_ldisc function.
Vulnerability Detail
The vulnerability in the tty_buffer implementation can cause a softlockup issue in the flush_to_ldisc function. This can occur when flushing data from the tty_buffer to the line discipline (ldisc) layer. The issue can be triggered by a specific sequence of operations or inputs, causing the system to become unresponsive or stuck in a loop. An attacker may potentially exploit this vulnerability to disrupt the normal operation of the system or launch a denial-of-service attack. It is important to note that the impact and attack plausibility of this vulnerability have not been proven.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been provided for this vulnerability.
Conclusion
The vulnerability in the Kernel's tty_buffer implementation can lead to a softlockup issue in the flush_to_ldisc function. It is crucial to update the Kernel to the fixed version (v4.4.293) to mitigate this vulnerability. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
The impact of this vulnerability can result in a softlockup issue, causing the system to become unresponsive or stuck in a loop. This can disrupt the normal operation of the system or potentially lead to a denial-of-service attack.
You can use Vulert's playground at Vulert Scanner to check if your system is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation.
Yes, a patch has been released in Linux Kernel version v4.4.293 by commit 0380f643f3a7a61b0845cdc738959c2ad5735d61. Users should update their Kernel to the fixed version to mitigate the vulnerability.
The remote exploitability of this vulnerability has not been determined. However, it is always recommended to keep systems up to date with the latest security patches to minimize the risk of exploitation.
You can find more information about this vulnerability in the Open Source Vulnerability database maintained by the Cloud Security Alliance. The specific vulnerability ID is UVI-2021-1002220.
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