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CVE-2020-2732

Published: 24 February 2020

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.

From the Ubuntu security team

Paulo Bonzini discovered that the KVM hypervisor implementation in the Linux kernel could improperly let a nested (level 2) guest access the resources of a parent (level 1) guest in certain situations. An attacker could use this to expose sensitive information.

Priority

Medium

CVSS 3 base score: 6.8

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-91.92)
eoan
Released (5.3.0-42.34)
focal Not vulnerable
(5.4.0-18.22)
precise Ignored
(was needed ESM criteria)
trusty Ignored
(was needed ESM criteria)
upstream
Released (5.6~rc4)
xenial
Released (4.4.0-176.206)
Patches:
Introduced by

8a76d7f25f8f24fc5a328c8e15e4a7313cf141b9

Fixed by 07721feee46b4b248402133228235318199b05ec
Introduced by

55d2375e58a61be072431dd3d3c8a320f4a4a01b

Fixed by e71237d3ff1abf9f3388337cfebf53b96df2020d
Introduced by

fb6d4d340e0532032c808a9933eaaa7b8de435ab

Fixed by 35a571346a94fb93b5b3b6a599675ef3384bc75c
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1063.67)
eoan
Released (5.3.0-1013.14)
focal Not vulnerable
(5.4.0-1005.5)
precise Does not exist

trusty
Released (4.4.0-1064.68)
upstream
Released (5.6~rc4)
xenial
Released (4.4.0-1104.115)
linux-aws-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1027.30)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Does not exist

linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial
Released (4.15.0-1063.67~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1035.37)
eoan
Released (5.3.0-1016.17)
focal Not vulnerable
(5.4.0-1006.6)
precise Does not exist

trusty
Released (4.15.0-1074.79~14.04.1)
upstream
Released (5.6~rc4)
xenial
Released (4.15.0-1075.80)
linux-azure-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1016.17~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Does not exist

linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Ignored
(was needs-triage now end-of-life)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1033.34)
eoan
Released (5.3.0-1014.15)
focal Not vulnerable
(5.4.0-1005.5)
precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial
Released (4.15.0-1058.62)
linux-gcp-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1014.15~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Does not exist

linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1055.58)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1032.33)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Does not exist

linux-gke-5.3
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-1014.15~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (5.3.0-42.34~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial
Released (4.15.0-91.92~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Ignored
(was needs-triage now end-of-life)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Ignored
(was needs-triage now end-of-life)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1056.57)
eoan
Released (5.3.0-1012.13)
focal Not vulnerable
(5.4.0-1004.4)
precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial
Released (4.4.0-1068.75)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

precise Ignored
(was needed ESM criteria)
trusty Does not exist

upstream
Released (5.6~rc4)
xenial Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Does not exist

precise Does not exist

trusty
Released (4.4.0-176.206~14.04.1)
upstream
Released (5.6~rc4)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1076.86)
eoan
Released (4.15.0-1076.86)
focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Ignored
(was needs-triage now end-of-life)
linux-oem-5.6
Launchpad, Ubuntu, Debian
bionic Does not exist

eoan Does not exist

focal Not vulnerable
(5.6.0-1007.7)
precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Does not exist

linux-oem-osp1
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1043.48)
eoan
Released (5.0.0-1043.48)
focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1035.39)
eoan
Released (5.3.0-1011.12)
focal Not vulnerable
(5.4.0-1005.5)
precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial
Released (4.15.0-1035.38~16.04.1)
linux-oracle-5.0
Launchpad, Ubuntu, Debian
bionic
Released (5.0.0-1013.18)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Does not exist

linux-oracle-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.3.0-1011.12~18.04.1)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (5.6~rc4)
xenial Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(Intel only)
eoan Not vulnerable
(Intel only)
focal Ignored
(was pending \[5.4.0-1006.6\] now end-of-life)
precise Does not exist

trusty Does not exist

upstream Not vulnerable
(Intel only)
xenial Not vulnerable
(Intel only)
linux-raspi2-5.3
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(Intel only)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream Not vulnerable
(Intel only)
xenial Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(Intel only)
eoan Does not exist

focal Does not exist

precise Does not exist

trusty Does not exist

upstream Not vulnerable
(Intel only)
xenial Not vulnerable
(Intel only)