Use-after-free due to delegation race in nfsd
Summary
GSD-2021-1002520: nfsd: fix use-after-free due to delegation race. Affects Kernel versions < eeb0711801f5e19ef654371b627682aed3b11373. No fix is published. How to fix ↓
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Background
The nfsd package is a component of the Linux Kernel that provides support for the Network File System (NFS) protocol. It allows remote clients to access files and directories on a server over a network. The package implements the server-side of the NFS protocol and handles various operations requested by clients. However, a vulnerability has been discovered in nfsd that can lead to a use-after-free condition due to a delegation race.
Vulnerability Detail
The use-after-free vulnerability in nfsd occurs due to a race condition related to delegations. When multiple threads attempt to access and modify the same delegation object concurrently, it can result in a use-after-free scenario. An attacker could potentially exploit this vulnerability to execute arbitrary code or cause a denial-of-service condition on the affected system. 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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Conclusion
The use-after-free vulnerability in nfsd can potentially lead to security issues and system instability. It is recommended to update the Linux Kernel to the latest version to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
nfsd is a component of the Linux Kernel that implements the server-side of the Network File System (NFS) protocol. It allows remote clients to access files and directories on a server over a network.
A use-after-free vulnerability occurs when a program continues to use a memory object after it has been freed. This can lead to various security issues, including crashes, memory corruption, and potential code execution.
An attacker could potentially exploit this vulnerability by triggering the race condition in nfsd, leading to a use-after-free scenario. This could allow the attacker to execute arbitrary code or cause a denial-of-service condition on the affected system.
No, the impact and attack plausibility of this vulnerability have not been proven yet. However, it is still important to apply the fix to ensure the security and stability of the system.
To fix this vulnerability, users should update their Linux Kernel to version v5.10.85 or later. The fix can be obtained from the official Linux Kernel repository.
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