Vulnerability in Kernel: nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect
Summary
GSD-2021-1000734: nfc: fix NULL ptr dereference in llcp_sock_getname() after failed connect. Affects Kernel versions >= d646960f7986fefb460a2b062d5ccc8ccfeacc3a, < ffff05b9ee5c74c04bba2801c1f99b31975d74d9. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that provides core functionalities and interfaces with hardware devices. It is responsible for managing system resources, handling input/output operations, and facilitating communication between software and hardware components. The NFC (Near Field Communication) subsystem within the Kernel enables short-range wireless communication between devices. It allows devices to exchange data and establish connections by utilizing radio frequency identification (RFID) technology. However, a vulnerability has been identified in the NFC subsystem that can lead to a NULL pointer dereference in the llcp_sock_getname() function after a failed connection attempt.
Vulnerability Detail
The vulnerability arises from a NULL pointer dereference in the llcp_sock_getname() function within the NFC subsystem. When a connection attempt fails, the function fails to handle the NULL pointer properly, leading to a potential crash or system instability. An attacker could potentially exploit this vulnerability to cause a denial-of-service (DoS) condition or execute arbitrary code with elevated privileges. 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
As a workaround, you can disable the NFC subsystem if it is not essential for your system's functionality. This can be achieved by modifying the Kernel configuration or disabling relevant modules. However, disabling NFC may impact any applications or functionalities that rely on NFC communication. It is recommended to consult the official documentation or seek assistance from the Kernel community for guidance on disabling the NFC subsystem.
Conclusion
In conclusion, a vulnerability has been identified in the Kernel's NFC subsystem that can result in a NULL pointer dereference. This vulnerability can potentially lead to system crashes, instability, or even unauthorized code execution. It is crucial to update the Kernel to the fixed version and ensure proper configuration of the NFC subsystem. If the NFC subsystem is not essential, disabling it can serve as a temporary workaround. For further support and assistance in vulnerability remediation, please contact DevNack.com.
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FAQ
The Kernel is a critical component of the Linux operating system that provides core functionalities and interfaces with hardware devices.
NFC (Near Field Communication) is a technology that enables short-range wireless communication between devices using radio frequency identification (RFID).
A NULL pointer dereference occurs when a program attempts to access or manipulate memory using a pointer that points to a NULL value. This can lead to crashes or system instability.
A denial-of-service (DoS) attack is an attempt to disrupt the normal functioning of a system or network by overwhelming it with a flood of illegitimate requests or malicious activities.
To update the Linux Kernel, you can obtain the latest version from the official Linux Kernel repository and follow the installation instructions provided. It is recommended to consult the documentation or seek assistance from the Kernel community for detailed guidance.
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