Vulnerability in Linux Kernel: wq: handle VM suspension in stall detection
Summary
GSD-2021-1000940: wq: handle VM suspension in stall detection. Affects Kernel versions < ad241cb1cffbe7f9d121ba728a381416e8540954. No fix is published. How to fix ↓
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Background
The Linux Kernel is a critical 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 across various devices and platforms. The wq (workqueue) subsystem is a part of the Linux Kernel that handles asynchronous work execution. It allows tasks to be offloaded to worker threads for parallel processing, improving system performance. However, a vulnerability has been discovered in the wq subsystem related to VM (Virtual Machine) suspension in stall detection.
Vulnerability Detail
The vulnerability in the wq subsystem of the Linux Kernel arises from a failure to handle VM suspension during stall detection. When a VM is suspended, the wq subsystem may not properly detect stalls, leading to potential performance issues or system instability. An attacker could exploit this vulnerability to cause a denial-of-service (DoS) condition or disrupt the normal functioning of the system. It is important to note that the impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
The vulnerability has been fixed in Linux Kernel version v5.10.44 by commit ad241cb1cffbe7f9d121ba728a381416e8540954. To rectify the vulnerability, it is recommended to update the Linux Kernel to the fixed version. This can be done by obtaining the updated kernel source code from the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and compiling it for the target system. Detailed instructions for building and installing the Linux Kernel can be found in the official documentation.
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Workaround
No specific workaround has been provided for this vulnerability.
Conclusion
In conclusion, a vulnerability has been identified in the wq subsystem of the Linux Kernel related to handling VM suspension in stall detection. It is recommended to update the Linux Kernel to the fixed version to mitigate the vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The Linux Kernel is a critical component of the Linux operating system, responsible for managing system resources and providing an interface for applications to interact with the hardware.
The wq (workqueue) subsystem is a part of the Linux Kernel that handles asynchronous work execution. It allows tasks to be offloaded to worker threads for parallel processing, improving system performance.
VM suspension refers to the process of pausing or freezing a virtual machine's execution. It is commonly used for saving the state of a VM and resuming it later.
The vulnerability could result in performance issues or system instability. An attacker could potentially exploit it to cause a denial-of-service (DoS) condition or disrupt the normal functioning of the system.
No, the impact and attack plausibility of this vulnerability have not been proven yet. Further analysis and testing may be required to assess the actual risk.
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