Vulnerability in Kernel: tty_buffer Softlockup Issue in flush_to_ldisc
Summary
GSD-2021-1002239: tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc. Affects Kernel versions < 4c1623651a0936ee197859824cdae6ebbd04d3ed. 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 services and functions for the proper functioning of the system. The tty subsystem in the Kernel handles input and output to and from terminal devices. The tty_buffer module is responsible for managing the input and output buffers for these devices. However, a vulnerability has been discovered in the flush_to_ldisc function of the tty_buffer module, which can lead to a softlockup issue.
Vulnerability Detail
The vulnerability in the flush_to_ldisc function of the tty_buffer module can cause a softlockup issue. This issue arises when a process gets stuck in a loop while trying to flush data to the line discipline (ldisc) layer. An attacker could exploit this vulnerability by sending specially crafted input to a terminal device, causing the affected system to become unresponsive. The impact of this vulnerability can range from denial of service to potential privilege escalation.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is essential to apply the provided fix by updating the Kernel to the recommended version.
Conclusion
In conclusion, the Kernel is vulnerable to a softlockup issue in the flush_to_ldisc function of the tty_buffer module. To mitigate this vulnerability, it is crucial to update the Kernel to version v4.14.256 or later. This fix addresses the issue and ensures the system is no longer susceptible to the softlockup problem. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a critical component of the Linux operating system that manages communication between hardware and software.
The tty subsystem in the Kernel handles input and output to and from terminal devices.
The tty_buffer module is responsible for managing the input and output buffers for terminal devices.
A softlockup issue occurs when a process gets stuck in a loop and becomes unresponsive.
The potential impacts of this vulnerability include denial of service and potential privilege escalation.
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