Vulnerability in Kernel: blk-cgroup UAF by destroying blkg pd
Summary
GSD-2021-1001744: blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd. Affects Kernel versions < 7c2c69e010431b0157c9454adcdd2305809bf9fb. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system that manages communication between hardware and software. It provides essential services and functions, including device drivers, memory management, and process scheduling. The blk-cgroup subsystem within the Kernel is responsible for managing block devices and their associated control groups (blkcg). Control groups allow for resource allocation and control, enabling administrators to manage block I/O operations effectively. However, a vulnerability has been identified in the blk-cgroup subsystem that could lead to a use-after-free (UAF) issue when destroying the block group (blkg) per-device (pd) structure.
Vulnerability Detail
The vulnerability arises due to a lack of proper synchronization when destroying the blkg pd structure. Without acquiring the necessary blkcg lock, the destruction process can result in a use-after-free scenario. An attacker could potentially exploit this vulnerability to execute arbitrary code or cause a denial-of-service (DoS) condition. The impact and attack plausibility of this vulnerability have not been proven yet. It is important to note that this vulnerability has been fixed in Linux Kernel version v5.14.9 by commit 7c2c69e010431b0157c9454adcdd2305809bf9fb.
How To Fix
No fixed version is published for this vulnerability.
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Conclusion
In conclusion, a vulnerability has been identified in the Kernel's blk-cgroup subsystem that could lead to a use-after-free issue when destroying blkg pd structures. It is crucial to update the Linux Kernel to version v5.14.9 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a critical component of the Linux operating system that manages communication between hardware and software. It provides essential services and functions, including device drivers, memory management, and process scheduling.
The blk-cgroup subsystem is a part of the Kernel that manages block devices and their associated control groups (blkcg). Control groups allow for resource allocation and control, enabling administrators to manage block I/O operations effectively.
A use-after-free vulnerability occurs when a program continues to use a memory reference after it has been freed. This can lead to various security issues, including the execution of arbitrary code or a denial-of-service (DoS) condition.
The impact of this vulnerability is not yet proven. However, if successfully exploited, an attacker could execute arbitrary code or cause a denial-of-service (DoS) condition.
Yes, this vulnerability has been fixed in Linux Kernel version v5.14.9 by commit 7c2c69e010431b0157c9454adcdd2305809bf9fb.
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