Vulnerability in Kernel: fid refcount leak in v9fs_vfs_atomic_open_dotl
Summary
GSD-2022-1004284: 9p: fix fid refcount leak in v9fs_vfs_atomic_open_dotl. Affects Kernel versions >= 6636b6dcc3db2258cd0585b8078c1c225c4b6dde, < 8bc5412ba1a45edfd1e451874c483c26a097af2b. 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 functionalities and acts as an interface between hardware and software. It manages system resources, facilitates communication between processes, and handles various system operations. The fid refcount leak vulnerability affects the Kernel's v9fs_vfs_atomic_open_dotl function, which is responsible for atomic file opening in the 9P protocol. This vulnerability can potentially lead to a refcount leak in the fid structure, causing resource exhaustion and potential denial-of-service attacks.
Vulnerability Detail
The fid refcount leak vulnerability in v9fs_vfs_atomic_open_dotl was introduced in version v5.11 of the Linux Kernel and fixed in version v5.18.8. When this vulnerability is exploited, it can result in a refcount leak in the fid structure, leading to resource exhaustion. An attacker could potentially trigger this vulnerability by performing a specially crafted operation, causing the fid structure's reference count to increment without decrementing it properly. This can result in the consumption of excessive system resources and potentially lead to a denial-of-service condition. 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.
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Workaround
No specific workaround has been provided for this vulnerability.
Conclusion
The fid refcount leak vulnerability in v9fs_vfs_atomic_open_dotl of the Kernel can lead to resource exhaustion and potential denial-of-service attacks. It is recommended to update the Linux Kernel to version v5.18.8 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability can potentially lead to resource exhaustion and denial-of-service attacks by causing a refcount leak in the fid structure.
You can use Vulert's playground at Vulert Scanner to check if your system is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the recommended fix to mitigate any potential risks.
No, only versions starting from v5.11 up to v5.18.7 are affected. The vulnerability has been fixed in version v5.18.8.
There is no evidence of active exploitation of this vulnerability at the time of this report. However, it is crucial to apply the recommended fix to ensure system security.
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