mISDN: Use-after-free vulnerability in HFC_cleanup()
Summary
GSD-2021-1001356: mISDN: fix possible use-after-free in HFC_cleanup(). Affects Kernel versions < 3ecd228c636ee17c14662729737fa07242a93cb0. 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 potentially remote code execution. An attacker could exploit this vulnerability by carefully crafting a malicious input that triggers the use-after-free condition, allowing them to execute arbitrary code or crash the system.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is recommended to update the Linux Kernel to the fixed version as soon as possible.
Conclusion
The use-after-free vulnerability in HFC_cleanup() in mISDN can lead to crashes, memory corruption, and potentially remote code execution. It is crucial to update the Linux Kernel to version v5.4.133 or later to mitigate 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 the computer and ISDN hardware.
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 can exploit this vulnerability by crafting a malicious input that triggers the use-after-free condition, allowing them to execute arbitrary code or crash the system.
Yes, this vulnerability has been fixed in Linux Kernel version v5.4.133 by commit 3ecd228c636ee17c14662729737fa07242a93cb0.
There is no known workaround for this vulnerability. It is recommended to update the Linux Kernel to the fixed version.
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