net: bridge: fix vlan tunnel dst null pointer dereference in Kernel
Summary
GSD-2021-1001089: net: bridge: fix vlan tunnel dst null pointer dereference. Affects Kernel versions >= 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd, < abb02e05cb1c0a30dd873a29f33bc092067dc35d. No fix is published. How to fix ↓
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Background
The Kernel is a fundamental component of the Linux operating system that provides essential services and functions to enable the system's operation. It manages system resources, facilitates communication between hardware and software components, and ensures the security and stability of the system. The net: bridge module in the Kernel is responsible for bridging network connections and handling VLAN tunneling. VLAN tunneling allows the encapsulation of VLAN-tagged packets within another VLAN, enabling the transmission of VLAN traffic across networks. However, a vulnerability has been discovered in the net: bridge module that can lead to a null pointer dereference when processing VLAN tunnel destinations.
Vulnerability Detail
The vulnerability in the net: bridge module arises from a null pointer dereference when handling VLAN tunnel destinations. This can occur when the module attempts to access a memory location that has not been properly initialized, resulting in a crash or potential code execution. An attacker could potentially exploit this vulnerability by sending specially crafted network packets to a vulnerable system, leading to a denial-of-service condition or the execution of arbitrary code. The impact and attack plausibility of this vulnerability have not been proven yet. The vulnerability was introduced in Kernel version v4.11 and has been fixed in version v5.12.13.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability at this time.
Conclusion
The net: bridge module in the Kernel is vulnerable to a null pointer dereference when handling VLAN tunnel destinations. This can potentially lead to a denial-of-service condition or the execution of arbitrary code. It is crucial to update the Kernel to version v5.12.13 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The net: bridge module in the Kernel is responsible for bridging network connections and handling VLAN tunneling. It allows the transmission of VLAN traffic across networks by encapsulating VLAN-tagged packets within another VLAN.
A null pointer dereference occurs when a program attempts to access a memory location that has not been properly initialized, resulting in a crash or potential code execution.
An attacker could potentially exploit this vulnerability by sending specially crafted network packets to a vulnerable system, leading to a denial-of-service condition or the execution of arbitrary code.
No, the impact and attack plausibility of this vulnerability have not been proven yet.
This vulnerability was introduced in Kernel version v4.11 and has been fixed in version v5.12.13.
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