Vulnerability in Kernel: isdn: mISDN: Fix sleeping function called from invalid context
Summary
GSD-2021-1001771: isdn: mISDN: Fix sleeping function called from invalid context. Affects Kernel versions < 6f95c97e0f9d6eb39c3f2cb45e8fa4268d1b372b. 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 interfaces with hardware devices. It manages system resources, facilitates communication between software and hardware, and ensures the stability and security of the system. The mISDN subsystem within the Kernel is responsible for handling ISDN (Integrated Services Digital Network) connections. ISDN is a telecommunications standard used for voice and data transmission over digital lines. The vulnerability in the mISDN subsystem allows a sleeping function to be called from an invalid context, potentially leading to system instability or crashes.
Vulnerability Detail
The vulnerability in the mISDN subsystem arises from a sleeping function being invoked from an invalid context. When a sleeping function is called from an invalid context, it can disrupt the normal execution flow and cause unexpected behavior. In the case of the mISDN subsystem, this vulnerability could potentially lead to system crashes or instability. An attacker may be able to exploit this vulnerability to trigger a denial-of-service (DoS) condition or execute arbitrary code with elevated privileges. The impact and attack plausibility of this vulnerability have not been proven yet. It is important to note that this vulnerability has been addressed in the Linux Kernel version v4.4.290 through commit 6f95c97e0f9d6eb39c3f2cb45e8fa4268d1b372b.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As this vulnerability has been fixed in the Linux Kernel version v4.4.290, there is no specific workaround available. However, users who are unable to immediately update to the fixed version can consider implementing additional security measures, such as network segmentation, access controls, and monitoring, to mitigate the potential impact of this vulnerability.
Conclusion
The vulnerability in the mISDN subsystem of the Kernel, which allowed a sleeping function to be called from an invalid context, has been addressed in the Linux Kernel version v4.4.290. It is crucial to update the Kernel to the fixed version or apply the necessary patches to ensure the security and stability of the system. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The mISDN subsystem is a component of the Linux Kernel that handles ISDN connections. It provides the necessary functionality to establish and manage ISDN-based communication channels for voice and data transmission.
The vulnerability in the mISDN subsystem could potentially lead to system crashes or instability. An attacker may be able to exploit this vulnerability to trigger a denial-of-service (DoS) condition or execute arbitrary code with elevated privileges.
No, the impact and attack plausibility of this vulnerability have not been proven yet. However, it is still important to apply the necessary updates to ensure the security and stability of the system.
To update the Linux Kernel, you can obtain the updated source code from the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and compile it for your system. Alternatively, you can check for available updates through your Linux distribution's package manager and apply the necessary patches.
As this vulnerability has been fixed in the Linux Kernel version v4.4.290, there is no specific workaround available. However, users who are unable to immediately update to the fixed version can consider implementing additional security measures, such as network segmentation, access controls, and monitoring, to mitigate the potential impact of this vulnerability.
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