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Xen における脆弱性
Title Xen における脆弱性
Summary

Xen には、不特定の脆弱性が存在します。

Possible impacts サービス運用妨害 (DoS) 状態にされる可能性があります。
Solution

ベンダより正式な対策が公開されています。ベンダ情報を参照して適切な対策を実施してください。
Publication Date Jan. 21, 2021, midnight
Registration Date Oct. 15, 2021, 4:35 p.m.
Last Update Oct. 15, 2021, 4:35 p.m.
CVSS3.0 : 警告
Score 5.5
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS2.0 : 警告
Score 4.9
Vector AV:L/AC:L/Au:N/C:N/I:N/A:C
Affected System
Fedora Project
Fedora 
Xen プロジェクト
Xen  4.12.3 から 4.12.4
Xen 4.13.1 から 4.14.x
CVE (情報セキュリティ 共通脆弱性識別子)
CWE (共通脆弱性タイプ一覧)
ベンダー情報
その他
Change Log
No Changed Details Date of change
1 [2021年10月15日]
  掲載		 Oct. 15, 2021, 4:35 p.m.
NVD Vulnerability Information
CVE-2021-3308
Summary

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.

Publication Date Jan. 27, 2021, 5:15 a.m.
Registration Date Jan. 27, 2021, 12:10 p.m.
Last Update Nov. 21, 2024, 3:21 p.m.
Affected software configurations
Configuration1 or higher or less more than less than
cpe:2.3:o:xen:xen:4.12.4:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:4.12.3:*:*:*:*:*:*:*
cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:* 4.13.1 4.14.1
Configuration2 or higher or less more than less than
cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:*
Related information, measures and tools
Common Vulnerabilities List