mISDN: Use-after-free vulnerability in HFC_cleanup()
Summary
UVI-2021-1001398: mISDN: fix possible use-after-free in HFC_cleanup(). Affects Kernel versions < 5f2818185da0fe82a932f0856633038b66faf124. No fix is published. How to fix ↓
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Background
mISDN is a module in the Linux Kernel that provides support for ISDN (Integrated Services Digital Network) devices. It allows communication between computers and ISDN networks. The HFC_cleanup() function is responsible for cleaning up resources associated with the HFC (Hybrid Function Chip) device. However, a use-after-free vulnerability has been discovered in this function, which could potentially lead to security issues.
Vulnerability Detail
The use-after-free vulnerability in HFC_cleanup() occurs when the function attempts to access memory that has already been freed. This can result in a crash or potentially be exploited by an attacker to execute arbitrary code or escalate privileges. The vulnerability has been assigned the ID UVI-2021-1001398 and has been fixed in Linux Kernel version v4.19.198 by commit 5f2818185da0fe82a932f0856633038b66faf124.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no specific workaround available for this vulnerability. It is recommended to apply the fix mentioned in the 'how_to_fix' section.
Conclusion
The use-after-free vulnerability in HFC_cleanup() of the mISDN module can pose a security risk by potentially allowing attackers to execute arbitrary code or escalate privileges. It is crucial to update the Linux Kernel to version v4.19.198 or later to mitigate this vulnerability. For further assistance or support in vulnerability remediation, please contact DevNack.com.
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FAQ
mISDN is a module in the Linux Kernel that provides support for ISDN devices and enables communication between computers and ISDN networks.
A use-after-free vulnerability occurs when a program attempts to access memory that has already been freed. This can lead to crashes or potential security exploits.
HFC_cleanup() is a function in the mISDN module that is responsible for cleaning up resources associated with the HFC (Hybrid Function Chip) device.
The use-after-free vulnerability in HFC_cleanup() could potentially be exploited by an attacker to execute arbitrary code or escalate privileges on the affected system.
To fix this vulnerability, update the Linux Kernel to version v4.19.198 or later by pulling the latest changes from the official Linux Kernel repository and recompiling the kernel.
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