Vulnerability in Kernel: iavf: free q_vectors before queues in iavf_disable_vf
Summary
GSD-2021-1002263: iavf: free q_vectors before queues in iavf_disable_vf. Affects Kernel versions >= 65c7006f234c9ede887d468f595f259a5c5cc552, < 926e8c83d4c1c2dac0026637eb0d492df876489e. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system that acts as a bridge between the hardware and software layers. It provides essential functionalities and services to enable the proper functioning of the system. This vulnerability specifically affects the iavf driver, which is responsible for managing Intel Ethernet Network Adapters. The vulnerability arises from a flaw in the iavf_disable_vf function, where q_vectors (queue vectors) are freed before the associated queues, leading to potential security issues.
Vulnerability Detail
The vulnerability in the iavf_disable_vf function of the iavf driver allows an attacker to exploit the freed q_vectors, potentially leading to security breaches. The flaw was introduced in version v4.13 of the Linux Kernel and was fixed in version v5.4.162. If left unpatched, an attacker could potentially manipulate the freed memory to execute arbitrary code or cause a denial-of-service (DoS) attack. It is important to note that the impact and attack plausibility of this vulnerability have not been proven.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can disable the iavf driver if it is not essential for their system's operation. This can be achieved by blacklisting the iavf module or removing it from the Kernel configuration. However, this workaround should only be considered if the iavf driver is not required, as it may impact the functionality of Intel Ethernet Network Adapters.
Conclusion
In conclusion, the vulnerability in the iavf driver of the Kernel could potentially lead to security breaches if left unpatched. It is crucial to update the Linux Kernel to version v5.4.162 or later to address this vulnerability. Alternatively, users can consider disabling the iavf driver if it is not necessary for their system's operation. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The iavf driver is responsible for managing Intel Ethernet Network Adapters in the Linux Kernel. It provides support for various features and functionalities specific to these network adapters.
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, such as package-lock.json, to identify and alert for open-source vulnerabilities in software without requiring code access or installation.
If exploited, this vulnerability could allow an attacker to execute arbitrary code or cause a denial-of-service (DoS) attack. However, the actual impact and attack plausibility have not been proven.
Yes, a patch for this vulnerability is available in the Linux Kernel version v5.4.162. It is recommended to update to this version or a later one to mitigate the risk.
Yes, as a temporary workaround, you can disable the iavf driver if it is not essential for your system's operation. This can be done by blacklisting the iavf module or removing it from the Kernel configuration.
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