Vulnerability in Linux Kernel: net: bridge: fix vlan tunnel dst refcnt when egressing
Summary
GSD-2021-1001090: net: bridge: fix vlan tunnel dst refcnt when egressing. Affects Kernel versions >= 11538d039ac6efcf4f1a6c536e1b87cd3668a9fd, < 25053a8404ba17ca48f5553d487afc1882e9f56c. No fix is published. How to fix ↓
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Background
The Linux Kernel is a widely used open-source operating system kernel that serves as the foundation for various Linux distributions. It provides essential functionality for managing system resources, device drivers, and network communication. The net/bridge module within the kernel is responsible for bridging network traffic between different interfaces. This vulnerability specifically affects the handling of VLAN tunnel destination reference counts during egress operations.
Vulnerability Detail
The vulnerability arises from an incorrect reference count management in the net/bridge module when processing VLAN tunnel traffic. This flaw could potentially be exploited by an attacker to cause a denial-of-service (DoS) condition or execute arbitrary code with elevated privileges. The issue was introduced in version 4.11 of the Linux Kernel and has been fixed in version 5.12.13.
How To Fix
No fixed version is published for this vulnerability.
To fix this vulnerability, it is recommended to update the Linux Kernel to version 5.12.13 or later. This can be done by obtaining the latest kernel source code from the official Linux Kernel repository (https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/) and compiling it for the target system. Alternatively, users can wait for their Linux distribution to provide an updated package containing the fixed kernel version.
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Workaround
No specific workaround has been mentioned for this vulnerability.
Conclusion
In conclusion, the Linux Kernel is affected by a vulnerability in the net/bridge module related to VLAN tunnel destination reference count management. This flaw could potentially lead to a denial-of-service (DoS) condition or enable arbitrary code execution. It is crucial to update the Linux Kernel to version 5.12.13 or later to mitigate the risk. For further support on vulnerability remediation, you can contact DevNack.com.
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FAQ
The vulnerability could potentially lead to a denial-of-service (DoS) condition or enable an attacker to execute arbitrary code with elevated privileges.
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 the playground will provide real-time alerts for open-source vulnerabilities.
Yes, the vulnerability has been fixed in Linux Kernel version 5.12.13. It is recommended to update to this version or a later one to mitigate the risk.
No specific temporary measures have been mentioned for this vulnerability. It is advisable to update to the fixed version as soon as possible.
You can refer to the vulnerability details in the GSD database (https://github.com/cloudsecurityalliance/gsd-database/blob/main/2021/1001xxx/GSD-2021-1001090.json) for more information.
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