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-2021-1002659: xen/netback: don't queue unlimited number of packages. Affects Kernel versions >= f48da8b14d04ca87ffcffe68829afd45f926ec6a, < c9f17e92917fd5786be872626a3928979ecc4c39. 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 functionality for Xen virtualization. It allows virtual machines to communicate with the physical network through the Xen hypervisor. This vulnerability in xen/netback 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 improper handling of package queueing. By exploiting this flaw, an attacker could send a large number of packages to a virtual machine, causing the queue to grow indefinitely. As a result, system resources such as memory and CPU may be exhausted, leading to a denial of service condition. This vulnerability was introduced in version v3.18 of the Linux Kernel and has been fixed in version v4.19.222.

How To Fix

No fixed version is published for this vulnerability.

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Workaround

There is no specific workaround mentioned for this vulnerability. The recommended solution is to update the Linux Kernel to the fixed version.

Conclusion

The unlimited package queueing vulnerability in xen/netback can be mitigated by updating the Linux Kernel to version v4.19.222 or later. It is important to regularly update the kernel to ensure the latest security patches are applied. For further support on vulnerability remediation, please contact DevNack.com.

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