CVE Vulnerability

CVE-2021-3308

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.

4.9 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 6.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact COMPLETE

Scope

5.5 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
http://xenbits.xen.org/xsa/advisory-360.html Patch Vendor Advisory
http://www.openwall.com/lists/oss-security/2021/01/26/4 Mailing List Patch
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/S5C42TMQYB6SDVT2MPFEWY65A6RSUVBN/ Third Party Advisory
https://security.gentoo.org/glsa/202107-30 Third Party Advisory
Configurations

Configuration 1

cpe:2.3:o:xen:xen:4.12.4:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.12.3:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
Information

Published : 2021-01-26 08:15

Updated : 2022-04-26 04:33

NVD link : CVE-2021-3308

Mitre link : CVE-2021-3308

Products Affected
No products.
CWE
NVD-CWE-noinfo