Use After Free Vulnerability in dm btree remove
Summary
GSD-2021-1002673: dm btree remove: fix use after free in rebalance_children(). Affects Kernel versions < 501ecd90efdc9b2edc6c28852ecd098a4adf8f00. No fix is published. How to fix ↓
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Background
The dm btree remove vulnerability affects the Kernel package in the Linux ecosystem. The Kernel is the core component of the Linux operating system, responsible for managing system resources and providing an interface for applications. The dm btree remove function is part of the device-mapper subsystem, which allows for the creation of virtual block devices. This vulnerability specifically impacts the rebalance_children() function within dm btree remove.
Vulnerability Detail
The dm btree remove vulnerability is a use after free issue in the rebalance_children() function. This vulnerability occurs when the function attempts to rebalance the children of a btree node during a remove operation. Due to a programming error, a use after free condition can be triggered, potentially leading to a variety of issues such as crashes, privilege escalation, or information disclosure. The impact and attack plausibility of this vulnerability have not been proven, but it is considered a security risk.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround provided for this vulnerability. The recommended action is to update the Linux Kernel to the fixed version.
Conclusion
The dm btree remove vulnerability in the Kernel package has been addressed in Linux Kernel version v5.4.168. It is crucial to update the Kernel to the fixed version to mitigate the risk of exploitation. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The dm btree remove vulnerability is a use after free issue in the rebalance_children() function of the Kernel's device-mapper subsystem. It can lead to various security risks.
The impact of this vulnerability can include crashes, privilege escalation, or information disclosure, although the actual impact and attack plausibility have not been proven.
To fix this vulnerability, update your Linux Kernel to version v5.4.168 or later.
No specific workaround is provided. Updating the Kernel to the fixed version is the recommended action.
You can find more information about this vulnerability in the Open Source Vulnerability Database (OSVDB) or by contacting the Linux Kernel development team.
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