Vulnerability in Kernel: Fix Underflow for the real_dev refcnt
Summary
GSD-2021-1002438: net: vlan: fix underflow for the real_dev refcnt. Affects Kernel versions >= 700602b662d7eaa816b1a3cb0abe7a85de358fd4, < 5e44178864b38dd70b877985abd7d86fdb95f27d. No fix is published. How to fix ↓
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Background
The Kernel is a critical component of the Linux operating system that manages communication between hardware and software. It provides essential functions and services to enable the proper functioning of the system. The vulnerability in question affects the Kernel's VLAN (Virtual Local Area Network) implementation. VLANs allow for the segmentation of a physical network into multiple virtual networks, improving network efficiency and security. However, a flaw in the VLAN code can lead to an underflow issue for the real_dev refcnt, potentially resulting in a security vulnerability.
Vulnerability Detail
The vulnerability arises from an underflow issue in the real_dev refcnt within the VLAN implementation of the Kernel. This underflow can be exploited by an attacker to trigger unexpected behavior or potentially execute arbitrary code. The impact and attack plausibility of this vulnerability have not been proven yet, but it is crucial to address it to ensure the integrity and security of the system. The vulnerability was introduced in Linux Kernel version v5.4.160 and has been fixed in version v5.4.163.
How To Fix
No fixed version is published for this vulnerability.
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Workaround
No specific workaround has been provided for this vulnerability. It is advised to apply the fix by updating the Linux Kernel to the recommended version.
Conclusion
The vulnerability in the Kernel's VLAN implementation, which caused an underflow issue in the real_dev refcnt, has been addressed in Linux Kernel version v5.4.163. It is crucial to update the Kernel to this version or later to mitigate the vulnerability and ensure the security of the system. For further support on vulnerability remediation, you can reach out to DevNack.com.
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FAQ
The impact of this vulnerability is not yet proven, but it has the potential to allow attackers to trigger unexpected behavior or execute arbitrary code.
You can use Vulert's playground at Vulert Scanner to check if your system is affected by this vulnerability. Vulert monitors and alerts in real-time for open-source vulnerabilities without requiring access to the code or installation.
No specific workaround has been provided for this vulnerability. It is recommended to update the Linux Kernel to the fixed version.
The vulnerability was introduced in Linux Kernel version v5.4.160 and has been fixed in version v5.4.163.
You can find more information about this vulnerability in the GSD-2021-1002438 entry of the GSD database at https://github.com/cloudsecurityalliance/gsd-database.
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