Vulnerability in Kernel: net: mdio: unexport __init-annotated mdio_bus_init()
Summary
GSD-2022-1003260: net: mdio: unexport __init-annotated mdio_bus_init(). Affects Kernel versions >= 90eff9096c01ba90cdae504a6b95ee87fe2556a3, < 59fa94cddf9eef8d8dae587373eed8b8f4eb11d7. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionality and acts as an interface between hardware and software. It manages system resources, facilitates communication between different components, and ensures the security and stability of the system. The net/mdio subsystem in the Kernel is responsible for handling communication with Ethernet PHY devices using the Management Data Input/Output (MDIO) bus. The MDIO bus is commonly used to configure and monitor Ethernet PHY devices. However, a vulnerability has been discovered in the mdio_bus_init() function, which is part of the net/mdio subsystem.
Vulnerability Detail
The vulnerability, identified as GSD-2022-1003260, stems from the unexported __init-annotated mdio_bus_init() function in the net/mdio subsystem of the Kernel. This vulnerability was introduced in Kernel version v4.12 by commit 90eff9096c01ba90cdae504a6b95ee87fe2556a3 and affects all subsequent versions until v5.15.47, where it was fixed by commit 59fa94cddf9eef8d8dae587373eed8b8f4eb11d7. The impact and attack plausibility of this vulnerability have not been proven yet. However, it is crucial to address it to ensure the security and integrity of systems utilizing the affected Kernel versions.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As this vulnerability has been fixed in Kernel version v5.15.47, applying the latest Kernel update is the recommended solution. However, if immediate update is not feasible, users can consider implementing network-level mitigations such as firewall rules to restrict access to vulnerable systems or employing intrusion detection systems to detect potential exploitation attempts.
Conclusion
The vulnerability in the Kernel's net/mdio subsystem, identified as GSD-2022-1003260, can potentially pose security risks to systems running affected Kernel versions. It is recommended to update the Kernel to version v5.15.47 or later to mitigate this vulnerability. Users can also utilize Vulert's playground (https://vulert.com/scanner) to check if their systems are affected. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The impact of this vulnerability is currently unknown, as no specific attack scenarios or exploit techniques have been identified. However, it is essential to address this vulnerability to prevent potential security breaches or system compromises.
You can use Vulert's playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Vulert uses a manifest file like package-lock.json to monitor and alert in real-time for open-source vulnerabilities in software, without requiring access to the code or installation.
The remote exploitability of this vulnerability is currently unknown. However, it is always recommended to apply security updates promptly to mitigate potential risks.
While the recommended solution is to update the Kernel to the fixed version, users can implement network-level mitigations such as firewall rules or intrusion detection systems to reduce the risk of exploitation.
As of now, there is no evidence of active exploits targeting this vulnerability. However, it is crucial to stay vigilant and apply security updates to protect against potential future exploits.
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