CVE-2021-3308

 

Published at: - 26-01-2021 09:15

Last modified: - 26-04-2022 06:33

Total changes: - 6

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

 

Verification logic

 

Reference

• http://xenbits.xen.org/xsa/advisory-360.html
• [oss-security] 20210126 Xen Security Advisory 360 v2 (CVE-2021-3308) - IRQ vector leak on x86-Mailing List, Patch, Third Party Advisory
• FEDORA-2021-16c9c40d4d-Third Party Advisory
• GLSA-202107-30-Third Party Advisory

 

Keywords

NVD

 

CVE-2021-3308

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures