mISDN: Use-after-free vulnerability in HFC_cleanup()
Summary
GSD-2021-1001461: mISDN: fix possible use-after-free in HFC_cleanup(). Affects Kernel versions < 54ff3202928952a100c477248e65ac6db01258a7. 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 the computer and ISDN hardware, enabling various telephony services. 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 potential 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 mISDN has been addressed in the Linux Kernel version v4.9.276. It is crucial to update the kernel to the latest version to ensure the security of the system. 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 the computer and ISDN hardware.
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 potential security exploits.
The potential impacts of this vulnerability include crashes, memory corruption, and potential remote code execution if successfully exploited by an attacker.
To fix this vulnerability, users should update their Linux Kernel to version v4.9.276 or later.
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