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CVE-2021-3308 Affecting xen package, versions <4.14.1-r2

0.0
medium

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.04% (6th percentile)
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NVD
5.5 medium
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SUSE
5.9 medium

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  • Snyk ID SNYK-ALPINE314-XEN-1308558
  • published 28 Feb 2021
  • disclosed 26 Jan 2021
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Introduced: 26 Jan 2021

CVE-2021-3308 Open this link in a new tab

How to fix?

Upgrade Alpine:3.14 xen to version 4.14.1-r2 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen package and not the xen package as distributed by Alpine. See How to fix? for Alpine:3.14 relevant fixed versions and status.

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.