mISDN: Use-after-free vulnerability in HFC_cleanup()
Summary
GSD-2021-1001233: mISDN: fix possible use-after-free in HFC_cleanup(). Affects Kernel versions < ed7c3739d0a07e2ec3ccbffe7e93cea01c438cda. 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 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 a variety of issues, including crashes, privilege escalation, and 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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Workaround
There is no specific workaround available for this vulnerability. It is recommended to apply the fix mentioned in the 'how_to_fix' section by updating the Linux Kernel to the latest version.
Conclusion
The use-after-free vulnerability in HFC_cleanup() in the mISDN module of the Linux Kernel can potentially lead to crashes, privilege escalation, and remote code execution. It is recommended to update the Linux Kernel to the latest version to address 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 kernel and ISDN hardware.
HFC_cleanup() is a function in the mISDN module that is responsible for cleaning up resources associated with the HFC device.
A use-after-free vulnerability occurs when a program attempts to access memory that has already been freed. This can lead to crashes, privilege escalation, and remote code execution.
An attacker could potentially exploit this vulnerability by crafting a malicious input that triggers the use-after-free condition in the HFC_cleanup() function.
No, the impact and attack plausibility of this vulnerability have not been proven yet.
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