mISDN: Use-after-free vulnerability in HFC_cleanup()
Summary
UVI-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 computers and ISDN networks. The HFC_cleanup() function in mISDN 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 to execute arbitrary code or escalate their privileges on a vulnerable system. The vulnerability has been assigned the ID UVI-2021-1001356 and has been fixed in Linux Kernel version v5.4.133.
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 essential to apply the patch provided in the updated Linux Kernel version to mitigate the risk of exploitation.
Conclusion
The use-after-free vulnerability in HFC_cleanup() of the mISDN module can be mitigated by updating the Linux Kernel to version v5.4.133 or later. It is crucial to apply this update to ensure the security and stability of systems utilizing ISDN devices. 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, enabling 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, memory corruption, and potential code execution.
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 allow an attacker to execute arbitrary code or escalate their privileges on a vulnerable system.
Yes, the vulnerability has been fixed in Linux Kernel version v5.4.133.
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