mISDN: Use-after-free vulnerability in HFC_cleanup()
Summary
GSD-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 be exploited by an attacker.
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 lead to a variety of issues, including crashes, memory corruption, and potentially remote code execution. An attacker could potentially exploit this vulnerability by carefully crafting a malicious input that triggers the use-after-free condition. 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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Conclusion
The use-after-free vulnerability in HFC_cleanup() in the mISDN module of the Linux Kernel can potentially lead to crashes, memory corruption, and remote code execution. It is recommended to update the Linux Kernel to version v4.19.198 or later to fix this vulnerability. For further support on 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, allowing communication between computers and ISDN networks.
HFC_cleanup() is a function in mISDN responsible for cleaning up resources associated with the HFC (Hybrid Function Chip) device.
A use-after-free vulnerability occurs when a program attempts to access memory that has already been freed. This can lead to crashes, memory corruption, and potentially remote code execution.
An attacker could potentially exploit this vulnerability by crafting a malicious input that triggers the use-after-free condition, leading to various issues including crashes and potentially remote code execution.
No, the impact and attack plausibility of this vulnerability have not been proven yet.
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