Critical Vulnerability in Linux Kernel: Uninitialized Memory in nfsd4_fattr_args.context
Summary
DEBIAN-CVE-2024-46697: In the Linux kernel, the following vulnerability has been resolved: nfsd: ensure that nfsd4_fattr_args.context is zeroed out If nfsd4_encode_fattr4 ends up doing a "goto out" before we get to checking for the security la... Affects linux versions < 6.10.9-1. Fixed in 6.10.9-1. How to fix ↓
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Background
The Linux kernel is the core component of the Linux operating system, responsible for managing hardware resources and providing essential services to applications. It is widely used in various environments, from servers to embedded systems. The kernel's functionality includes process management, memory management, device drivers, and system calls. This vulnerability affects the Linux kernel versions in Debian 13 and 14, specifically in the nfsd (Network File System daemon) component, which handles file sharing over a network.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the nfsd component where the nfsd4_fattr_args.context variable may contain uninitialized data from the stack. If the function nfsd4_encode_fattr4 exits prematurely (via a 'goto out' statement), the context variable is not properly initialized, leading to potential security risks. This uninitialized memory could be exploited to leak sensitive information or cause undefined behavior in the system, posing a significant threat to system integrity and security.
How To Fix
Minimum fixed version
6.10.9-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade linuxTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
Currently, there are no specific workarounds mentioned for this vulnerability. The best course of action is to apply the patch as soon as it is available.
Conclusion
The identified vulnerability in the Linux kernel's nfsd component poses a significant risk due to uninitialized memory usage. Users are strongly advised to update to the patched version to mitigate potential security threats. Regular monitoring and updates are essential for maintaining system integrity.
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FAQ
The vulnerability involves uninitialized memory in the nfsd4_fattr_args.context variable, which can lead to security risks if exploited.
The vulnerability affects the Linux kernel versions in Debian 13 and 14 prior to the fixed version 6.10.9-1.
You can use tools like Vulert to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check if your application is affected.
Exploitation of this vulnerability could lead to information leakage or undefined behavior, compromising system security.
Yes, a patch is available in the form of the Linux kernel version 6.10.9-1. Users should update their systems to this version.
References
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