ovl: Fix Leaked Dentry in Kernel
Summary
GSD-2021-1000126: ovl: fix leaked dentry. Affects Kernel versions >= 6815f479ca90ee7fd2e28b2a420f796b974155fe, < cf3e3330bc5719fa9d658e3e2f596bde89344a94. 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 core functionality and acts as an interface between hardware and software. It manages system resources, facilitates communication between different software components, and ensures the security and stability of the system. The Overlay Filesystem (ovl) is a feature in the Kernel that allows multiple file systems to be layered on top of each other, providing a unified view of the files. However, a vulnerability has been discovered in the ovl module that can lead to a leaked dentry.
Vulnerability Detail
The ovl module in the Kernel has a flaw that can result in a leaked dentry. A dentry is a data structure used to represent directory entries in the file system. When a file or directory is accessed, the Kernel creates a dentry to store information about the entry. In the case of the ovl module, a dentry can be leaked, meaning it is not properly released after use. This can lead to resource leaks and potential memory corruption issues. An attacker may be able to exploit this vulnerability to gain unauthorized access, escalate privileges, or cause a denial-of-service condition.
How To Fix
No fixed version is published for this vulnerability.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.11.19 or later. The fix for this issue was implemented in commit cf3e3330bc5719fa9d658e3e2f596bde89344a94. Updating the Kernel will ensure that the leaked dentry issue is resolved and the system is protected against potential attacks.
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Workaround
There is no known workaround for this vulnerability. It is essential to update the Kernel to the fixed version to mitigate the risk.
Conclusion
The ovl module in the Linux Kernel has a vulnerability that can result in a leaked dentry. This can lead to resource leaks and potential memory corruption issues, allowing attackers to gain unauthorized access or escalate privileges. To mitigate this risk, it is crucial to update the Kernel to version v5.11.19 or later. No known workarounds are available for this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
A dentry is a data structure used to represent directory entries in the file system. It stores information about files and directories, such as their names, permissions, and other attributes.
An attacker may exploit this vulnerability to gain unauthorized access, escalate privileges, or cause a denial-of-service condition. By leveraging the leaked dentry, they can manipulate the file system and potentially execute arbitrary code.
At the time of this report, there are no known public exploits targeting this specific vulnerability. However, it is crucial to update the Kernel to the fixed version to prevent any potential exploitation.
No, this vulnerability was introduced in version v5.8 of the Linux Kernel. Versions prior to v5.8 are not affected. However, it is still recommended to update to the latest fixed version to ensure the system's security.
You can use Vulert's playground at Vulert Scanner to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in the software.
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