Memory Leak Vulnerability in Linux Kernel CIFS Package
Summary
CVE-2022-50076: In the Linux kernel, the following vulnerability has been resolved: cifs: Fix memory leak on the deferred close xfstests on smb21 report kmemleak as below: unreferenced object 0xffff8881767d6200 (size 64): comm "xfs_io",... Affects linux versions < 6.0.2-1. Fixed in 6.0.2-1. 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. The CIFS (Common Internet File System) module allows for file sharing over a network, enabling users to access files on remote servers. This package is critical for systems that rely on network file sharing, making its security paramount. The vulnerability identified as CVE-2022-50076 pertains to a memory leak issue that can occur during the deferred close operation, potentially leading to resource exhaustion.
Vulnerability Detail
CVE-2022-50076 is a memory leak vulnerability in the CIFS module of the Linux kernel. The issue arises when the deferred close work is canceled without properly cleaning up the associated data structures, specifically the 'cifs_deferred_close' structure. This oversight can result in unreferenced memory objects persisting in the system, which may lead to increased memory usage and, ultimately, resource exhaustion. The vulnerability was detected during xfstests on smb21, where kmemleak reported unreferenced objects, indicating that memory allocated for certain operations was not released correctly. If exploited, this vulnerability could degrade system performance and stability.
How To Fix
Minimum fixed version
6.0.2-1
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
CVE-2022-50076 is a significant memory leak vulnerability in the CIFS module of the Linux kernel that can lead to resource exhaustion. It is essential to update to the patched version to ensure system stability and security. Monitoring tools like Vulert can assist in identifying vulnerabilities in your applications.
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FAQ
CVE-2022-50076 is a memory leak vulnerability in the CIFS module of the Linux kernel that can lead to resource exhaustion.
This vulnerability can cause increased memory usage, potentially leading to system performance degradation and instability.
Yes, a patch is available in version 6.0.2-1 of the Linux package. It is recommended to update to this version or later.
You can use Vulert, which monitors and alerts for open-source vulnerabilities in your software. You can check your application using the Vulert playground without any signup.
While there are no specific workarounds, it is crucial to prioritize applying the patch as soon as possible to mitigate the risk associated with this vulnerability.
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