Memory Leak in net: bridge: vlan
Summary
GSD-2022-1000634: net: bridge: vlan: fix memory leak in __allowed_ingress. Affects Kernel versions >= a580c76d534c7360ba68042b19cb255e8420e987, < 14be8d448fca6fe7b2a413831eedd55aef6c6511. No fix is published. How to fix ↓
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Background
The net: bridge: vlan package is a component of the Linux Kernel that handles VLAN functionality within network bridges. It allows for the creation and management of virtual LANs (VLANs) on a bridge device. VLANs are used to segment network traffic and improve network performance and security. However, a vulnerability has been discovered in this package that can lead to a memory leak.
Vulnerability Detail
The vulnerability in net: bridge: vlan is caused by a memory leak in the __allowed_ingress function. This function is responsible for handling ingress filtering for VLAN packets. Due to a coding error, memory allocated during the ingress filtering process is not properly freed, leading to a memory leak. An attacker could potentially exploit this vulnerability to exhaust system memory resources, resulting in a denial-of-service condition. The vulnerability was introduced in version v5.6 of the Linux Kernel and has been fixed in version v5.16.5.
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 recommended to apply the fix by updating the Linux Kernel.
Conclusion
The memory leak vulnerability in net: bridge: vlan can be mitigated by updating the Linux Kernel to version v5.16.5 or later. This will ensure that the __allowed_ingress function properly frees allocated memory, preventing potential memory exhaustion and denial-of-service attacks. For further support on vulnerability remediation, please contact DevNack.com.
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FAQ
Net: bridge: vlan is a component of the Linux Kernel that handles VLAN functionality within network bridges. It allows for the creation and management of virtual LANs (VLANs) on a bridge device.
A memory leak is a type of software bug where allocated memory is not properly freed, leading to a gradual loss of available memory resources. In this case, the memory leak occurs in the __allowed_ingress function of net: bridge: vlan.
The vulnerability can be exploited by an attacker to exhaust system memory resources, potentially leading to a denial-of-service condition.
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 Vulert Playground will analyze it for any open-source vulnerabilities, including this one.
Yes, the vulnerability has been fixed in version v5.16.5 of the Linux Kernel. It is recommended to update your system's Linux Kernel to this version or later.
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