Race Condition Vulnerability in Linux Kernel's ksmbd Component
Summary
CVE-2023-32256: A flaw was found in the Linux kernel's ksmbd component. Affects linux versions < abcc506a9a71976a8b4c9bf3ee6efd13229c1e19. No fix is published. How to fix ↓
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Background
The Linux kernel is a core component of many operating systems, providing essential services and functionalities. The ksmbd component specifically facilitates SMB (Server Message Block) protocol support, allowing for file sharing and network communication. This component is critical for systems that rely on SMB for file access and sharing across networks. However, it is susceptible to vulnerabilities that can compromise system integrity and security.
Vulnerability Detail
A flaw was identified in the ksmbd component of the Linux kernel, where a race condition exists between the SMB2 close operation and logoff in multichannel connections. This race condition can lead to a use-after-free issue, potentially allowing an attacker to exploit the vulnerability to execute arbitrary code or crash the system. The vulnerability is classified with a CVSS score of 7.5, indicating a high severity level that necessitates immediate attention.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, consider disabling multichannel support in SMB configurations until the patch is applied. This can be done by modifying the smb.conf file and setting the 'server multi channel' option to 'no'.
Conclusion
CVE-2023-32256 represents a significant vulnerability in the Linux kernel's ksmbd component, with the potential for severe consequences if left unaddressed. It is crucial to apply the necessary updates to protect systems from exploitation. Utilizing tools like Vulert can help monitor and manage vulnerabilities effectively.
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FAQ
CVE-2023-32256 is a vulnerability in the Linux kernel's ksmbd component that can lead to a use-after-free condition due to a race condition.
The vulnerability can allow attackers to execute arbitrary code or crash the system, leading to data loss or unauthorized access.
You can use Vulert, which monitors open-source vulnerabilities in your software using a manifest file like package-lock.json. Visit Vulert Scanner to check your application without any signup.
Yes, patches are available for Debian 12 and 13. Ensure you update to the specified patched versions to mitigate the vulnerability.
If immediate patching is not possible, consider disabling multichannel support in your SMB configurations as a temporary workaround.
References
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