Deadlock Vulnerability in Linux Kernel
Summary
GSD-2022-1003764: tty: fix deadlock caused by calling printk() under tty_port->lock. Affects Kernel versions >= b6da31b2c07c46f2dcad1d86caa835227a16d9ff, < 3219ac364ac3d8d30771612a6010f1e0b7fa0a28. No fix is published. How to fix ↓
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Background
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and providing an interface for applications to interact with the hardware. It is widely used in various devices, including servers, desktops, and embedded systems. The vulnerability identified in this report affects the Linux Kernel and specifically impacts the tty subsystem, which handles terminal devices. The vulnerability arises from a deadlock caused by calling printk() under tty_port->lock, leading to potential system instability and denial of service.
Vulnerability Detail
The vulnerability in the Linux Kernel arises from a deadlock situation that can occur when printk() is called under tty_port->lock. This can lead to a system deadlock, where multiple processes are unable to proceed due to a circular dependency on the tty_port->lock. An attacker could potentially exploit this vulnerability to cause a denial of service by triggering the deadlock condition. The vulnerability was introduced in version v4.18 of the Linux Kernel and has been fixed in version v5.4.198. It is recommended to update to the fixed version to mitigate the risk.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability. The recommended approach is to update the Linux Kernel to the fixed version.
Conclusion
In conclusion, a vulnerability has been identified in the Linux Kernel that can lead to a system deadlock when calling printk() under tty_port->lock. This vulnerability can be exploited to cause a denial of service. It is crucial to update the Linux Kernel to version v5.4.198 or later to mitigate the risk. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and providing an interface for applications to interact with the hardware.
The tty subsystem in the Linux Kernel handles terminal devices, providing the necessary functionality for input and output operations.
A deadlock is a situation where multiple processes are unable to proceed because each is waiting for a resource that is held by another process in the deadlock cycle.
The vulnerability can lead to a system deadlock, causing system instability and denial of service.
To mitigate the risk, it is recommended to update the Linux Kernel to version v5.4.198 or later.
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