Critical Vulnerability in Linux Kernel: Reference Count Issue in ksmbd Connection
Summary
DEBIAN-CVE-2024-49988: In the Linux kernel, the following vulnerability has been resolved: ksmbd: add refcnt to ksmbd_conn struct When sending an oplock break request, opinfo->conn is used, But freed ->conn can be used on multichannel. Affects linux versions < 6.11.4-1. Fixed in 6.11.4-1. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, including Debian. It manages system resources and hardware interactions, providing essential services for software applications. The kernel is crucial for system stability and performance. This vulnerability specifically affects the ksmbd (Kernel SMB Direct) module, which facilitates file sharing over the SMB protocol. The issue arises from improper handling of connection references, potentially leading to system instability.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the ksmbd module related to the handling of connection references. When sending an oplock break request, the opinfo->conn can reference a freed connection, particularly in multichannel scenarios. This flaw can lead to undefined behavior, including potential crashes or exploitation by malicious actors. The vulnerability has been assigned the identifier DEBIAN-CVE-2024-49988 and affects both Debian 13 and 14 versions of the Linux package.
How To Fix
Minimum fixed version
6.11.4-1
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 provided for this vulnerability. It is recommended to apply the patch as soon as it is available to mitigate any risks associated with this issue.
Conclusion
The identified vulnerability in the Linux kernel's ksmbd module poses significant risks to system stability and security. Users are strongly encouraged to update their Linux packages to the patched version 6.11.4-1 to mitigate these risks. Continuous monitoring for vulnerabilities using tools like Vulert can help maintain system integrity.
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FAQ
The vulnerability involves improper reference counting in the ksmbd connection structure, which can lead to the use of freed memory.
The vulnerability affects the Linux packages in Debian 13 and 14, specifically versions prior to 6.11.4-1.
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 system crashes, data corruption, or unauthorized access to system resources.
The best course of action is to apply the patch as soon as it is available. There are currently no known workarounds.
References
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