Unlimited Package Queueing Vulnerability in xen/netback

Kernel Updated 02 Oct 2025

Summary

27/12/2021

Disclosed on

N/A

Severity

No i

Fix available

Unrated

Severity

Not published

CVSS Score

GSD-2021-1002711: xen/netback: don't queue unlimited number of packages. Affects Kernel versions >= f48da8b14d04ca87ffcffe68829afd45f926ec6a, < 88f20cccbeec9a5e83621df5cc2453b5081454dc. No fix is published. How to fix ↓

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Background

The xen/netback package is a component of the Linux Kernel that provides network backend support for Xen virtualization. It allows virtual machines to communicate with the physical network interface. The package is responsible for handling incoming and outgoing network traffic for virtual machines. However, a vulnerability has been discovered in the package that allows an unlimited number of packages to be queued, potentially leading to resource exhaustion and denial of service.

Vulnerability Detail

The vulnerability in xen/netback arises from the package's failure to limit the number of packages that can be queued. This can be exploited by an attacker to overwhelm the system with a large number of network packages, causing resource exhaustion and potentially leading to a denial of service condition. The vulnerability was introduced in version v3.18 of the Linux Kernel and has been fixed in version v5.10.88. It is important to note that the impact and attack plausibility of this vulnerability have not yet been proven.

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 v5.10.88 or later. This update includes the necessary patch to limit the number of packages that can be queued in xen/netback. It is advisable to follow the official documentation and guidelines provided by the Linux Kernel development team for updating the Kernel.

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Workaround

There is no specific workaround mentioned for this vulnerability. The recommended approach is to apply the fix by updating the Linux Kernel to the latest version.

Conclusion

The xen/netback package in the Linux Kernel is vulnerable to an unlimited package queueing issue, which can result in resource exhaustion and denial of service. It is crucial to update the Linux Kernel to version v5.10.88 or later to mitigate this vulnerability. For further support and assistance in vulnerability remediation, please contact DevNack.com.

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