Vulnerability in Kernel: tty_buffer Softlockup Issue in flush_to_ldisc
Summary
GSD-2021-1002293: tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc. Affects Kernel versions < 77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41. 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 and services to enable the proper functioning of the system. One of its key components is the tty subsystem, which handles input and output devices, such as terminals and serial ports. The tty_buffer is responsible for managing the input and output data in the tty subsystem. However, a vulnerability has been discovered in the flush_to_ldisc function of the tty_buffer, which can lead to a softlockup issue.
Vulnerability Detail
The vulnerability in the flush_to_ldisc function of the tty_buffer can result in a softlockup issue. This issue arises when a process gets stuck in an infinite loop while trying to flush data to the line discipline (ldisc). An attacker could potentially exploit this vulnerability to cause a denial-of-service (DoS) condition by triggering the softlockup and rendering the affected system unresponsive. The vulnerability has been addressed in the Linux Kernel version v5.10.82 through the commit 77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41.
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 advised to apply the fix mentioned in the 'how_to_fix' section to ensure the system is protected against the softlockup issue.
Conclusion
The vulnerability in the flush_to_ldisc function of the tty_buffer in the Kernel can lead to a softlockup issue, potentially causing a denial-of-service (DoS) condition. It is crucial to update the Linux Kernel to version v5.10.82 or later to mitigate this vulnerability. For further assistance and support in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can lead to a softlockup issue, causing the affected system to become unresponsive and potentially resulting in a denial-of-service (DoS) condition.
An attacker can exploit this vulnerability by triggering the softlockup issue, which can be done by sending specially crafted input to the affected system's tty subsystem.
Yes, the vulnerability has been fixed in the Linux Kernel version v5.10.82 through the commit 77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41.
The vulnerability affects Linux Kernel versions prior to v5.10.82. Systems running older versions may be vulnerable and should be updated to the patched version.
More information about this vulnerability can be found in the vulnerability database maintained by the Cloud Security Alliance. The specific vulnerability ID is GSD-2021-1002293.
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