Vulnerability in Kernel: Disallow Extremely Large seq Buffer Allocations
Summary
GSD-2021-1001323: seq_file: disallow extremely large seq buffer allocations. Affects Kernel versions >= 058504edd02667eef8fac9be27ab3ea74332e9b4, < c1dafbb26164f43f2bb70bee9e5c4e1cad228ca7. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system that manages system resources and facilitates communication between hardware and software. It provides essential functionalities such as process management, memory management, and device drivers. The vulnerability in question affects the seq_file module, which is responsible for providing sequential access to data stored in kernel memory through the /proc file system. This vulnerability allows for the allocation of excessively large seq buffers, potentially leading to resource exhaustion and denial-of-service attacks.
Vulnerability Detail
The vulnerability arises from a lack of validation in the seq_file module, which allows for the allocation of extremely large seq buffers. An attacker could exploit this by crafting a malicious request that triggers the allocation of a large buffer, consuming excessive system resources and potentially leading to a denial-of-service condition. The impact of this vulnerability has not been proven, but it poses a risk of resource exhaustion and disruption of system functionality. The vulnerability was introduced in version v3.16 of the Linux Kernel and has been fixed in version v5.4.134.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround provided for this vulnerability. It is advised to apply the recommended fix by updating the Linux Kernel to the latest version.
Conclusion
The vulnerability in the Kernel that allowed for the allocation of extremely large seq buffers has been addressed in the latest version. It is crucial to update the Linux Kernel to version v5.4.134 or later to ensure the system is protected against potential exploitation. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a core component of the Linux operating system that manages system resources and facilitates communication between hardware and software.
The seq_file module provides sequential access to data stored in kernel memory through the /proc file system.
The impact of this vulnerability has not been proven, but it poses a risk of resource exhaustion and disruption of system functionality.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.4.134 or later.
Yes, this vulnerability has been fixed in Linux Kernel version v5.4.134.
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