regmap: set debugfs_name to NULL after it is freed
Summary
GSD-2021-1000463: regmap: set debugfs_name to NULL after it is freed. Affects Kernel versions >= 5b654b03007917f3f1015b2a5c288c1ea6ae8f65, < 2dc1554d5f0fdaf47cc5bea442b84b9226fea867. No fix is published. How to fix ↓
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Background
The regmap package is a part of the Linux Kernel ecosystem. It provides a framework for accessing and manipulating hardware registers in a device-independent manner. The package allows drivers to read from and write to registers, providing an interface between the hardware and the software running on the system. The debugfs_name attribute is used to assign a name to the debugfs entry associated with the regmap instance.
Vulnerability Detail
The vulnerability in the regmap package involves not setting the debugfs_name attribute to NULL after it is freed. This can lead to a use-after-free vulnerability, where an attacker can exploit the freed debugfs_name pointer to execute arbitrary code or cause a denial of service. The impact and attack plausibility of this vulnerability have not been proven yet.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround mentioned for this vulnerability.
Conclusion
The regmap package in the Linux Kernel is vulnerable to a use-after-free vulnerability related to the debugfs_name attribute. To mitigate this vulnerability, it is recommended to update the kernel to version v4.19.191 or later. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
Regmap is a package in the Linux Kernel ecosystem that provides a framework for accessing and manipulating hardware registers in a device-independent manner.
The debugfs_name attribute is used to assign a name to the debugfs entry associated with the regmap instance.
A use-after-free vulnerability occurs when a program continues to use a pointer after it has been freed, leading to potential security issues.
If an attacker can exploit the freed debugfs_name pointer, they may be able to execute arbitrary code or cause a denial of service.
No, the impact and attack plausibility of this vulnerability have not been proven yet.
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