net/sched: tcindex: search key must be 16 bits - Kernel
Summary
GSD-2023-1002344: net/sched: tcindex: search key must be 16 bits. Affects Kernel versions >= becf55394f6acb60dd60634a1c797e73c747f9da, < 1cbb51d83f564305bfe93cdac8516233dc708483. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages system resources and provides an interface for applications to interact with the hardware. It is responsible for tasks such as process management, memory management, and device drivers. The tcindex module within the Kernel is used for traffic control and classification. It provides a mechanism for mapping packets to traffic classes based on a search key.
The vulnerability in the tcindex module arises from an incorrect implementation of the search key, which must be 16 bits in size. Due to this flaw, the search key can exceed the allowed size, leading to potential security vulnerabilities.
Vulnerability Detail
The vulnerability in the tcindex module of the Kernel allows for a search key that exceeds the required 16-bit size. This can result in various security issues, although the specific impact and attack vectors have not been proven yet. The vulnerability was introduced in version v5.15.95 of the Linux Kernel and has been fixed in version v5.15.95 by commit 1cbb51d83f564305bfe93cdac8516233dc708483.
To exploit this vulnerability, an attacker could potentially manipulate the search key to bypass traffic classification rules or cause denial-of-service conditions. However, the exact consequences depend on the specific usage of the tcindex module in the system.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can disable the tcindex module if it is not essential for their system's functionality. This can be achieved by removing or blacklisting the relevant kernel module or disabling the corresponding kernel configuration option during the compilation process.
Conclusion
The vulnerability in the tcindex module of the Kernel, which allows for a search key exceeding the required size, can have various security implications. It is crucial to update the Linux Kernel to version v5.15.95 or later to mitigate this vulnerability. Users can also utilize the Vulert Playground (https://vulert.com/scanner) to check if their system is affected and obtain further support for vulnerability remediation.
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FAQ
The impact of this vulnerability can vary depending on the specific usage of the tcindex module in the system. It could potentially allow attackers to bypass traffic classification rules or cause denial-of-service conditions.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. It analyzes the manifest file like package-lock.json to identify vulnerabilities in the software without requiring access to the code or installation.
Yes, a patch for this vulnerability is available in version v5.15.95 of the Linux Kernel. It is recommended to update to this version or a later one to fix the issue.
As a temporary mitigation, you can disable the tcindex module if it is not necessary for your system's functionality. However, it is strongly recommended to update the Kernel to the fixed version as soon as possible.
You can find more information about this vulnerability in the GSD-2023-1002344 entry of the GSD Database maintained by the Cloud Security Alliance. The entry can be accessed at https://github.com/cloudsecurityalliance/gsd-database/blob/main/2023/1002xxx/GSD-2023-1002344.json.
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