CIFS Open Info Data Vulnerability in Linux Kernel - CVE-2026-93801
Summary
DEBIAN-CVE-2026-93801: In the Linux kernel, the following vulnerability has been resolved: smb/client: zero-initialize stack-allocated cifs_open_info_data Stack-allocated cifs_open_info_data may contain random data. Affects linux versions 6.1.106-1 – 7.2~rc7-1~exp1. No fix is published. How to fix ↓
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Background
The Linux kernel is the core component of many operating systems, including Debian. It manages hardware resources and provides essential services for software applications. The kernel is crucial for system stability and performance. This vulnerability specifically affects the CIFS (Common Internet File System) client, which allows for file sharing over a network. The issue arises from stack-allocated data not being properly initialized, leading to potential security risks.
Vulnerability Detail
In the Linux kernel, a vulnerability has been identified in the CIFS client where the stack-allocated 'cifs_open_info_data' structure may contain uninitialized data. This can result in some fields holding incorrect values if they are not explicitly set later in the code. The origin of this vulnerability lies in the failure to zero-initialize the stack memory, which can lead to unpredictable behavior and potential exploitation by malicious actors. The ramifications include the possibility of unauthorized access or manipulation of shared files, posing a significant security threat.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
Currently, no specific workaround has been provided for this vulnerability. However, users are advised to monitor their systems for any unusual behavior and ensure that they are running the latest versions of all software.
Conclusion
The CVE-2026-93801 vulnerability in the Linux kernel poses significant risks due to uninitialized stack memory in the CIFS client. Users are encouraged to update their systems to the latest patched versions to mitigate these risks. Regular monitoring and updates are essential for maintaining system security.
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FAQ
CVE-2026-93801 is a vulnerability in the Linux kernel's CIFS client that involves uninitialized stack memory, potentially leading to incorrect data handling.
This vulnerability can lead to incorrect values being processed in file sharing operations, which may result in unauthorized access or data corruption.
Yes, a patched version of the Linux package is available. For Debian 14, the fixed version is 7.2.6-1.
You can use Vulert, which monitors open-source vulnerabilities in your software. Visit Vulert Scanner to check your application without needing to sign up.
While there is no specific workaround, it is crucial to monitor your system for any unusual activity and plan to update as soon as possible.
References
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