net: ll_temac: Fix TX BD buffer overwrite in Kernel
Summary
GSD-2021-1000932: net: ll_temac: Fix TX BD buffer overwrite. Affects Kernel versions >= 0c050d6554757f1be861b9f288406989c4053449, < b6c0ab11c88fb016bfc85fa4f6f878f5f4263646. No fix is published. How to fix ↓
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Background
The Kernel is a crucial component of the Linux operating system that provides core functionalities and acts as an interface between hardware and software. It includes various subsystems, including the network subsystem, which manages network communication. One of the network drivers in the Kernel is ll_temac, which is responsible for handling Ethernet communication for Xilinx devices. However, a vulnerability has been discovered in the ll_temac driver that can lead to a buffer overwrite in the transmit (TX) buffer descriptors (BD). This vulnerability can potentially be exploited by an attacker to manipulate network traffic or cause a denial-of-service (DoS) condition.
Vulnerability Detail
The vulnerability in the ll_temac driver arises from a buffer overwrite in the TX BD. When transmitting network packets, the driver uses a set of BDs to manage the buffers. Due to a coding error, it is possible for the driver to overwrite the buffer associated with a TX BD, leading to unexpected behavior and potential security issues. The exact impact of this vulnerability and the plausibility of an attack are yet to be proven. However, it is crucial to address this issue to ensure the integrity and security of network communication.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
As a workaround, users can consider disabling the ll_temac driver if it is not essential for their system's operation. However, this may impact the functionality of Xilinx devices that rely on this driver for Ethernet communication. It is advisable to consult the Xilinx documentation or support channels for guidance on alternative solutions or mitigations.
Conclusion
The ll_temac driver in the Linux Kernel is vulnerable to a buffer overwrite issue in the TX BD, which can have security implications for network communication. It is recommended to update the Kernel to the latest version to fix this vulnerability. Disabling the driver can be considered as a temporary workaround, but it may impact the functionality of Xilinx devices. For further support and assistance in vulnerability remediation, please reach out to DevNack.com.
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FAQ
The exact impact of this vulnerability is yet to be proven. However, it has the potential to allow an attacker to manipulate network traffic or cause a denial-of-service (DoS) condition.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.4.128 or later. This fix is implemented in commit b6c0ab11c88fb016bfc85fa4f6f878f5f4263646.
As a workaround, users can consider disabling the ll_temac driver if it is not essential for their system's operation. However, this may impact the functionality of Xilinx devices that rely on this driver for Ethernet communication.
At the time of this report, no known exploits for this vulnerability have been identified. However, it is crucial to address the issue promptly to mitigate any potential risks.
For more information about this vulnerability, you can refer to the source link provided in the database_specific section of the vulnerability details.
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