Denial of Service (DoS) Affecting xen package, versions [4.13.1,]


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-UNMANAGED-XEN-2383726
  • published26 Jan 2022
  • disclosed26 Jan 2021
  • creditUnknown

Introduced: 26 Jan 2021

CVE-2021-3308  (opens in a new tab)
CWE-400  (opens in a new tab)

How to fix?

There is no fixed version for xen.

Overview

Affected versions of this package are vulnerable to Denial of Service (DoS). An issue was discovered in Xen 4.12.3 through 4.12.4 and 4.13.1 through 4.14.x. An x86 HVM guest with PCI pass through devices can force the allocation of all IDT vectors on the system by rebooting itself with MSI or MSI-X capabilities enabled and entries setup. Such reboots will leak any vectors used by the MSI(-X) entries that the guest might had enabled, and hence will lead to vector exhaustion on the system, not allowing further PCI pass through devices to work properly. HVM guests with PCI pass through devices can mount a Denial of Service (DoS) attack affecting the pass through of PCI devices to other guests or the hardware domain. In the latter case, this would affect the entire host.

References

CVSS Scores

version 3.1