Vulnerability in Linux Kernel: net: systemport: Add global locking for descriptor lifecycle
Summary
GSD-2021-1002706: net: systemport: Add global locking for descriptor lifecycle. Affects Kernel versions >= 80105befdb4b8cea924711b40b2462b87df65b62, < 6e1011cd183faae8daff275c72444edcdfe0d473. No fix is published. How to fix ↓
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Background
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and providing essential services to applications. It is a critical piece of software that enables the functioning of various hardware devices and software components. The net subsystem within the Linux Kernel handles network-related operations and protocols. One specific component of the net subsystem is the systemport, which manages the lifecycle of descriptors used for network communication.
The vulnerability identified in the systemport component of the Linux Kernel allows for a lack of global locking during the descriptor lifecycle. This can potentially lead to race conditions and inconsistent state management, which may result in various security issues and system instability. The vulnerability was introduced in version v3.16 of the Linux Kernel and has been fixed in version v5.10.88.
Vulnerability Detail
The vulnerability in the systemport component of the Linux Kernel arises from the absence of global locking during the descriptor lifecycle. Without proper synchronization, concurrent operations on descriptors can lead to race conditions, inconsistent state management, and potential security vulnerabilities. Attackers may exploit these vulnerabilities to gain unauthorized access, execute arbitrary code, or cause denial-of-service conditions. The impact and attack plausibility of this vulnerability have not been proven yet, but it is crucial to address it to ensure the stability and security of the Linux Kernel.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As this vulnerability has been fixed in the latest version of the Linux Kernel, applying the update is the recommended solution. However, if updating immediately is not feasible, a temporary workaround can be implemented by manually adding global locking for the descriptor lifecycle in the affected code. The following code snippet demonstrates an example of how the global locking can be added:
// Add global locking for descriptor lifecycle
// Acquire the global lock before performing any operations on descriptors
acquire_global_lock();
// Perform descriptor operations
...
// Release the global lock after completing descriptor operations
release_global_lock();
Please note that this workaround is not a permanent solution and should only be used until the Kernel update can be applied.
Conclusion
The vulnerability in the systemport component of the Linux Kernel, which resulted from the absence of global locking during the descriptor lifecycle, has been addressed in version v5.10.88. It is crucial to update the Linux Kernel to this version or later to ensure the stability and security of the system. Applying the provided workaround or seeking further assistance from DevNack.com can help mitigate the risk until the update can be applied.
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FAQ
The Linux Kernel is the core component of the Linux operating system, responsible for managing system resources and providing essential services to applications. It enables the functioning of various hardware devices and software components.
The net subsystem in the Linux Kernel handles network-related operations and protocols. It provides the necessary functionality for networking in the Linux operating system.
The systemport component in the net subsystem of the Linux Kernel manages the lifecycle of descriptors used for network communication. It ensures proper handling and management of descriptors during network operations.
The lack of global locking during the descriptor lifecycle can lead to race conditions, inconsistent state management, and potential security vulnerabilities. Attackers may exploit these vulnerabilities to gain unauthorized access, execute arbitrary code, or cause denial-of-service conditions.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.10.88 or later. This version includes the necessary fix for the lack of global locking during the descriptor lifecycle.
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