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Alpine Linux: CVE-2021-3308: Vulnerability in Xen

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Alpine Linux: CVE-2021-3308: Vulnerability in Xen

Severity
5
CVSS
(AV:L/AC:L/Au:N/C:N/I:N/A:C)
Published
01/26/2021
Created
04/09/2024
Added
03/26/2024
Modified
04/09/2024

Description

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.

Solution(s)

  • alpine-linux-upgrade-xen

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