Vulnerability in liquidio package: Fix unintented sign extension of a left shift of a u16
Summary
GSD-2021-1000426: liquidio: Fix unintented sign extension of a left shift of a u16. Affects Kernel versions >= 5bc67f587ba7eaa8dd3976bfeff8f2b60718c871, < 440fead0fc81192d2f893e238378574f6d9fb3c3. No fix is published. How to fix ↓
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Background
The liquidio package is a component of the Linux Kernel, which is responsible for managing network interfaces and providing networking capabilities to the operating system. It includes drivers and modules for various network devices. The vulnerability in the liquidio package arises from an unintended sign extension of a left shift operation on a 16-bit unsigned integer (u16).
Vulnerability Detail
The vulnerability occurs due to a coding error in the liquidio package, specifically in the handling of left shift operations on a u16 variable. The error results in an unintended sign extension, which can lead to unexpected behavior and potential security vulnerabilities. Attackers may be able to exploit this vulnerability to execute arbitrary code, escalate privileges, or cause a denial-of-service condition. The vulnerability was introduced in version v4.9 of the Linux Kernel and has been fixed in version v5.4.119.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can apply a patch provided by the Linux Kernel community. The patch modifies the affected code to ensure that the left shift operation on the u16 variable does not result in sign extension. Here is an example of the patch:
- variable = (u16 << shift);
+ variable = (u16 << shift) & 0xFFFF;
Conclusion
The vulnerability in the liquidio package, which is part of the Linux Kernel, can lead to potential security risks if left unaddressed. It is crucial to update the Linux Kernel to version v5.4.119 or later to fix this vulnerability. In the meantime, users can apply the provided workaround patch to mitigate the risk. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can potentially allow attackers to execute arbitrary code, escalate privileges, or cause a denial-of-service condition.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file and the Vulert Playground will analyze it for any open-source vulnerabilities, including this one.
At the time of this report, there is no known exploit for this vulnerability. However, it is important to apply the necessary fixes to mitigate any potential risks.
Yes, you can apply the provided workaround patch to mitigate the vulnerability until an official fix is available. However, it is still recommended to update to the fixed version of the Linux Kernel as soon as possible.
You can find more information about this vulnerability in the official GitHub repository of the Cloud Security Alliance's GSD Database (https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1000xxx/GSD-2021-1000426.json).
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