CVE-2020-2732 Information

Description

A flaw was discovered in the way that the KVM hypervisor handled instruction emulation for an L2 guest when nested virtualisation is enabled. Under some circumstances an L2 guest may trick the L0 guest into accessing sensitive L1 resources that should be inaccessible to the L2 guest.

CVSS Vector

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

Reference

https://bugzilla.redhat.com/show_bug.cgi?id=1805135 https://git.kernel.org/linus/07721feee46b4b248402133228235318199b05ec https://git.kernel.org/linus/35a571346a94fb93b5b3b6a599675ef3384bc75c https://git.kernel.org/linus/e71237d3ff1abf9f3388337cfebf53b96df2020d https://linux.oracle.com/errata/ELSA-2020-5540.html https://linux.oracle.com/errata/ELSA-2020-5542.html https://linux.oracle.com/errata/ELSA-2020-5543.html https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html https://lists.debian.org/debian-lts-announce/2020/06/msg00012.html https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html https://www.debian.org/security/2020/dsa-4667 https://www.debian.org/security/2020/dsa-4698 https://www.openwall.com/lists/oss-security/2020/02/25/3 https://www.spinics.net/lists/kvm/msg208259.html

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

HIGH

Availability Impact

NONE

Base Score

NONE

Base Severity

6.8