mcb: Fix Error Handling in mcb_alloc_bus() - Kernel
Summary
UVI-2021-1001521: mcb: fix error handling in mcb_alloc_bus(). Affects Kernel versions >= 5d9e2ab9fea4cdf0a2522f5cbed2e7fbb220d757, < 8a558261fa57a6deefb0925ab1829f698b194aea. 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 functionalities and acts as a bridge between hardware and software. It manages system resources, facilitates communication between different components, and ensures the stability and security of the system. The mcb_alloc_bus() function is a part of the Kernel's MCB (Multichannel Buffered) subsystem, which is responsible for managing communication channels and buffers. This vulnerability specifically affects the mcb_alloc_bus() function within the Kernel.
Vulnerability Detail
The vulnerability in mcb_alloc_bus() arises from a lack of proper error handling. When this function encounters an error condition, it fails to handle it appropriately, potentially leading to unexpected behavior or system instability. Attackers may exploit this vulnerability to cause a denial-of-service (DoS) attack or execute arbitrary code with elevated privileges. The vulnerability was introduced in version v4.7 of the Linux Kernel and has been fixed in version v4.9.285.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a temporary workaround, users can disable or restrict access to the MCB subsystem by modifying the system configuration. This can be achieved by blacklisting the 'mcb' module or using kernel command-line parameters to prevent its loading. However, this workaround may limit the functionality of certain applications or components that rely on the MCB subsystem.
Conclusion
The vulnerability in mcb_alloc_bus() within the Kernel can potentially lead to a denial-of-service (DoS) attack or arbitrary code execution. It is crucial to update the Linux Kernel to version v4.9.285 or later to mitigate this vulnerability. Alternatively, users can apply a temporary workaround by restricting access to the MCB subsystem. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
This vulnerability can potentially lead to a denial-of-service (DoS) attack or allow attackers to execute arbitrary code with elevated privileges.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your manifest file (e.g., package-lock.json) 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 public exploit for this vulnerability. However, it is advisable to apply the recommended fix as soon as possible to mitigate any potential risks.
While updating the Kernel is the recommended approach, you can apply a temporary workaround by disabling or restricting access to the MCB subsystem. However, this may impact the functionality of certain applications or components that rely on the MCB subsystem.
For more detailed information about this vulnerability, including technical details and the specific commits that address it, you can refer to the vulnerability database entry at https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/UVI-2021-1001521.json.
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