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 breakdown
CVSS 3.1
Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None
Affected products
References
- MAILING_LISThttps://www.openwall.com/lists/oss-security/2020/02/25/3
- MISChttps://www.spinics.net/lists/kvm/msg208259.html
- MISChttps://git.kernel.org/linus/07721feee46b4b248402133228235318199b05ec
- MISChttps://git.kernel.org/linus/35a571346a94fb93b5b3b6a599675ef3384bc75c
- MISChttps://git.kernel.org/linus/e71237d3ff1abf9f3388337cfebf53b96df2020d
- MISChttps://bugzilla.redhat.com/show_bug.cgi?id=1805135
- VENDOR_ADVISORYhttps://linux.oracle.com/errata/ELSA-2020-5540.html
- VENDOR_ADVISORYhttps://linux.oracle.com/errata/ELSA-2020-5542.html
- VENDOR_ADVISORYhttps://linux.oracle.com/errata/ELSA-2020-5543.html
- VENDOR_ADVISORYhttps://www.debian.org/security/2020/dsa-4667
- MAILING_LISThttps://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
- MAILING_LISThttps://lists.debian.org/debian-lts-announce/2020/06/msg00012.html
- MAILING_LISThttps://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
- VENDOR_ADVISORYhttps://www.debian.org/security/2020/dsa-4698
Updated 29m ago · 8 sources