Vulnerability in Linux Kernel: net: bridge: fix vlan tunnel dst null pointer dereference
Summary
GSD-2021-1000934: net: bridge: fix vlan tunnel dst null pointer dereference. Affects Kernel versions >= 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd, < a2241e62f6b4a774d8a92048fdf59c45f6c2fe5c. No fix is published. How to fix ↓
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Background
The Linux Kernel is a critical component of the Linux operating system, responsible for managing the system's core functionality. It provides various features and services, including process management, memory management, device drivers, and networking. The net: bridge module within the kernel handles bridging of network packets between different network interfaces. This vulnerability specifically affects the handling of VLAN tunnel destination (dst) in the bridge module.
Vulnerability Detail
The vulnerability in the net: bridge module of the Linux Kernel allows for a null pointer dereference when processing VLAN tunnel destination information. An attacker could exploit this vulnerability by sending specially crafted network packets, leading to a null pointer dereference and potentially resulting in a system crash or privilege escalation. The vulnerability was introduced in version v4.11 of the Linux Kernel and has been fixed in version v5.4.128.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
There is no known workaround for this vulnerability. It is essential to apply the fix by updating the Linux Kernel to a patched version.
Conclusion
The vulnerability in the net: bridge module of the Linux Kernel, which allows for a null pointer dereference when processing VLAN tunnel destination information, can have severe consequences if exploited. It is crucial to update the Linux Kernel to version v5.4.128 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
The vulnerability can potentially lead to a system crash or privilege escalation if exploited by an attacker.
You can use the Vulert Playground (https://vulert.com/scanner) to check if your system is affected by this vulnerability. Simply upload your package-lock.json file, and Vulert will analyze it for any known vulnerabilities.
Yes, this vulnerability can be exploited remotely by sending specially crafted network packets.
There is no evidence of this vulnerability being actively exploited at the moment. However, it is crucial to apply the fix to mitigate any potential risks.
You can find more information about this vulnerability in the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and the Cloud Security Alliance GSD database (https://github.com/cloudsecurityalliance/gsd-database).
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