NFC: digital: Fix Possible Memory Leak in digital_in_send_sdd_req()
Summary
GSD-2021-1001774: NFC: digital: fix possible memory leak in digital_in_send_sdd_req(). Affects Kernel versions >= 2c66daecc4092e6049673c281b2e6f0d5e59a94c, < 74569c78aa84f8c958f1334b465bc530906ec99a. No fix is published. How to fix ↓
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Background
The NFC (Near Field Communication) digital module is a component of the Linux Kernel, which provides support for NFC communication on compatible devices. It allows devices to establish short-range wireless communication for various applications, such as contactless payments, data transfer, and device pairing. The digital_in_send_sdd_req() function is responsible for sending a Secure Digital Device (SDD) request in the digital module. However, a potential memory leak has been identified in this function, which could lead to resource exhaustion and system instability.
Vulnerability Detail
The vulnerability, identified as GSD-2021-1001774, originates from a possible memory leak in the digital_in_send_sdd_req() function of the NFC digital module. If this memory leak occurs, it can gradually deplete system resources, potentially leading to system crashes or denial-of-service conditions. An attacker could potentially exploit this vulnerability to exhaust system memory intentionally, causing disruption or instability. The vulnerability was introduced in version v3.13 of the Linux Kernel and has been fixed in version v4.4.290 by commit 74569c78aa84f8c958f1334b465bc530906ec99a.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can consider disabling NFC functionality on their systems if it is not required. This can be achieved by modifying the system configuration or disabling relevant kernel modules. However, this workaround may not be applicable in scenarios where NFC functionality is essential for specific use cases.
Conclusion
In conclusion, the NFC digital module in the Linux Kernel is vulnerable to a memory leak in the digital_in_send_sdd_req() function. This vulnerability can result in resource exhaustion and system instability. It is crucial to update the Linux Kernel to version v4.4.290 or later to mitigate this vulnerability. Disabling NFC functionality can serve as a temporary workaround, but it may not be applicable in all scenarios. For further assistance and support in addressing this vulnerability, please contact DevNack.com.
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FAQ
NFC (Near Field Communication) is a short-range wireless communication technology that enables devices to exchange data over a distance of a few centimeters. It is commonly used for contactless payments, data transfer, and device pairing.
The digital module in the Linux Kernel provides support for NFC communication on compatible devices. It allows devices to establish short-range wireless communication for various applications.
The digital_in_send_sdd_req() function is responsible for sending a Secure Digital Device (SDD) request in the NFC digital module. It is a critical component for initiating communication with NFC devices.
If exploited, this vulnerability can lead to a gradual depletion of system resources, potentially causing system crashes or denial-of-service conditions. It can be used by attackers to exhaust system memory intentionally, leading to disruption or instability.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v4.4.290 or later. This update includes the necessary fix for the memory leak in digital_in_send_sdd_req(). Users should follow standard procedures for updating the kernel, ensuring compatibility and proper testing before deployment.
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