Vulnerability in Kernel: blk-mq Dispatch Work Cancellation
Summary
GSD-2021-1002549: blk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release(). Affects Kernel versions < e03513f58919d9e2bc6df765ca2c9da863d03d90. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides essential functionality and acts as an interface between hardware and software. It manages various resources and facilitates communication between different system components. The blk-mq (block multi-queue) subsystem within the Kernel is responsible for handling block I/O requests efficiently. It utilizes dispatch work to process these requests. However, a vulnerability has been identified in the Kernel's blk-mq subsystem, specifically in the cancellation of blk-mq dispatch work during the cleanup and release processes.
Vulnerability Detail
The vulnerability arises from the failure to cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release() functions. This oversight can lead to potential security risks. An attacker could exploit this vulnerability to execute arbitrary code, cause a denial-of-service (DoS) condition, or gain unauthorized access to sensitive information. The impact and attack plausibility of this vulnerability have not been proven yet. It is important to note that this vulnerability has been fixed in Linux Kernel version v5.15.6 by commit e03513f58919d9e2bc6df765ca2c9da863d03d90.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been mentioned for this vulnerability. It is advised to apply the fix by updating the Linux Kernel to the recommended version.
Conclusion
The vulnerability in the Kernel's blk-mq subsystem, related to the cancellation of blk-mq dispatch work, poses potential security risks. It is crucial to update the Linux Kernel to version v5.15.6 or later to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a critical component of the Linux operating system that provides essential functionality and acts as an interface between hardware and software.
blk-mq (block multi-queue) is a subsystem within the Kernel that efficiently handles block I/O requests.
The impact of this vulnerability could include arbitrary code execution, denial-of-service (DoS) attacks, or unauthorized access to sensitive information.
Yes, the vulnerability has been fixed in Linux Kernel version v5.15.6 by commit e03513f58919d9e2bc6df765ca2c9da863d03d90.
To update the Linux Kernel, obtain the latest release from the official Linux Kernel repository and follow the provided installation instructions.
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