mISDN: Use-after-free Vulnerability in HFC_cleanup()
Summary
GSD-2021-1001491: mISDN: fix possible use-after-free in HFC_cleanup(). Affects Kernel versions < 49331c07ef0f8fdfa42b30ba6a83a657b29d7fbe. No fix is published. How to fix ↓
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Background
mISDN is a Linux kernel subsystem that provides support for ISDN (Integrated Services Digital Network) devices. It allows communication between the Linux kernel and ISDN hardware. 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 various issues, including crashes, memory corruption, and potentially remote code execution. An attacker could exploit this vulnerability by carefully manipulating the memory layout to execute arbitrary code or cause a denial-of-service condition.
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. However, users can mitigate the risk by applying the recommended fix and updating their Linux Kernel to the patched version.
Conclusion
The use-after-free vulnerability in HFC_cleanup() of the mISDN subsystem can lead to crashes, memory corruption, and potential code execution. It is crucial to update the Linux Kernel to version v4.4.276 or later to fix this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
mISDN is a Linux kernel subsystem that provides support for ISDN devices, allowing communication between the Linux kernel 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 potential code execution.
An attacker can exploit this vulnerability by carefully manipulating the memory layout to execute arbitrary code or cause a denial-of-service condition.
Yes, a fix is available in the Linux Kernel version v4.4.276 or later. Updating the kernel to this version will address the use-after-free vulnerability.
While no specific workaround is mentioned, users can mitigate the risk by updating their Linux Kernel to the patched version.
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