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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Oracle | Oracle Linux | 7, 6 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 5.5.13-1 | — |
| Debian 13 | linux | 5.5.13-1 | — |
| Debian 12 | linux | 5.5.13-1 | — |
| Debian 10 | linux | 4.19.98-1+deb10u1 | DSA-4667-1 |
| Debian 9 | linux | 4.9.210-1+deb9u1 | DSA-4698-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | linux | 3.16.84-1 | DLA-2241-1 |
| Debian 8 | linux-4.9 | 4.9.210-1+deb9u1~deb8u1 | DLA-2242-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +3 | No fix yet | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-91.92 | USN-4302-1 |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1063.67 | USN-4302-1 |
| Ubuntu 18.04 LTS | linux-aws-5.0 | 5.0.0-1027.30 | USN-4301-1 |
| Ubuntu 18.04 LTS | linux-azure | 5.0.0-1035.37 | USN-4301-1 |
| Ubuntu 18.04 LTS | linux-azure-5.3 | 5.3.0-1016.17~18.04.1 | USN-4300-1 |
| Ubuntu 18.04 LTS | linux-gcp | 5.0.0-1033.34 | USN-4301-1 |
| Ubuntu 18.04 LTS | linux-gcp-5.3 +1 | 5.3.0-1014.15~18.04.1 | USN-4300-1 |
| Ubuntu 18.04 LTS | linux-gcp-edge +2 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gke-4.15 | 4.15.0-1055.58 | USN-4302-1 |
| Ubuntu 18.04 LTS | linux-gke-5.0 | 5.0.0-1032.33 | USN-4301-1 |
| Ubuntu 18.04 LTS | linux-hwe | 5.3.0-42.34~18.04.1 | USN-4300-1 |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1056.57 | USN-4302-1 |
| Ubuntu 18.04 LTS | linux-oem | 4.15.0-1076.86 | USN-4302-1 |
| Ubuntu 18.04 LTS | linux-oem-osp1 | 5.0.0-1043.48 | USN-4301-1 |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1035.39 | USN-4302-1 |
| Ubuntu 18.04 LTS | linux-oracle-5.0 | 5.0.0-1013.18 | USN-4301-1 |
| Ubuntu 18.04 LTS | linux-raspi2 | 4.15.0-1057.61 | USN-4302-1 |
| Ubuntu 18.04 LTS | linux-raspi2-5.3 | 5.3.0-1019.21~18.04.1 | USN-4300-1 |
| Ubuntu 18.04 LTS | linux-snapdragon | 4.15.0-1074.81 | USN-4302-1 |
| Ubuntu 16.04 LTS | linux | 4.4.0-176.206 | USN-4303-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1104.115 | USN-4303-1 |
| Ubuntu 16.04 LTS | linux-aws-hwe | 4.15.0-1063.67~16.04.1 | USN-4302-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.15.0-1075.80 | USN-4302-1 |
| Ubuntu 16.04 LTS | linux-gcp | 4.15.0-1058.62 | USN-4302-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.15.0-91.92~16.04.1 | USN-4302-1 |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1068.75 | USN-4303-1 |
| Ubuntu 16.04 LTS | linux-oracle | 4.15.0-1035.38~16.04.1 | USN-4302-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro FIPS 18.04 LTS | linux-aws-fips +2 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2018.18 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2006.7 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1031.36 | — |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1064.68 | USN-4303-2 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1074.79~14.04.1 | USN-4302-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-176.206~14.04.1 | USN-4303-2 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | kernel-rt +12 | 4.18.0-193.1.2.rt13.53.el8_2 | RHSA-2020:2171 |
| RHEL 8 | perf +26 | 4.18.0-193.1.2.el8_2 | RHSA-2020:2102 |
| RHEL 7 | kernel-rt +10 | 3.10.0-1160.rt56.1131.el7 | RHSA-2020:4062 |
| RHEL 7 | perf +18 | 3.10.0-1160.el7 | RHSA-2020:4060 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP1 | kernel-azure +2 | 4.12.14-8.30.1 | SUSE-SU-2020:1087-1 |
| SLES 15 SP1 | kernel-docs +5 | 4.12.14-197.34.1 | SUSE-SU-2020:0560-1 |
| SLES 15 | kernel-docs +6 | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SLES 12 SP5 | kernel-azure +2 | 4.12.14-16.10.1 | SUSE-SU-2020:0558-1 |
| SLES 12 SP5 | kernel-docs +4 | 4.12.14-122.20.1 | SUSE-SU-2020:1142-1 |
| SLES 12 SP4 | kernel-azure +2 | 4.12.14-6.37.1 | SUSE-SU-2020:0559-1 |
| SLES 12 SP4 | kernel-docs +4 | 4.12.14-95.48.1 | SUSE-SU-2020:0584-1 |
| SLES 12 SP3 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SLES 12 SP3 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
Show 19 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | kernel-syms +2 | 4.4.121-92.129.1 | SUSE-SU-2020:1255-1 |
| SLES 12 SP2 | kgraft-patch-SLE12-SP2_Update_34 | 1-3.3.1 | SUSE-SU-2020:1255-1 |
| SLES for SAP 15 | kernel-docs +5 | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SLES for SAP 12 SP5 | kernel-azure +2 | 4.12.14-16.10.1 | SUSE-SU-2020:0558-1 |
| SLES for SAP 12 SP5 | kernel-syms +2 | 4.12.14-122.20.1 | SUSE-SU-2020:1142-1 |
| SLES for SAP 12 SP4 | kernel-azure +2 | 4.12.14-6.37.1 | SUSE-SU-2020:0559-1 |
| SLES for SAP 12 SP4 | kernel-syms +2 | 4.12.14-95.48.1 | SUSE-SU-2020:0584-1 |
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SLES for SAP 12 SP3 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.121-92.129.1 | SUSE-SU-2020:1255-1 |
| SLES for SAP 12 SP2 | kgraft-patch-SLE12-SP2_Update_34 | 1-3.3.1 | SUSE-SU-2020:1255-1 |
| SLE Real Time 12 SP5 | kernel-rt +3 | 4.12.14-10.5.1 | SUSE-SU-2020:0667-1 |
| SLE Real Time 12 SP4 | kernel-rt +3 | 4.12.14-8.15.1 | SUSE-SU-2020:0649-1 |
| SLE Live Patching 15 SP1 | kernel-default | 4.12.14-197.34.1 | SUSE-SU-2020:0560-1 |
| SLE Live Patching 15 SP1 | kernel-livepatch-SLE15-SP1_Update_9 | 1-3.5.1 | SUSE-SU-2020:0560-1 |
| SLE Live Patching 15 | kernel-default | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SLE Live Patching 15 | kernel-livepatch-SLE15_Update_18 | 1-1.5.1 | SUSE-SU-2020:1663-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.20.1 | SUSE-SU-2020:1142-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_4 | 1-8.3.1 | SUSE-SU-2020:1142-1 |
| SLE Live Patching 12 SP4 | kernel-default | 4.12.14-95.48.1 | SUSE-SU-2020:0584-1 |
| SLE Live Patching 12 SP4 | kgraft-patch-SLE12-SP4_Update_12 | 1-6.3.1 | SUSE-SU-2020:0584-1 |
| SLE HPC 15 | kernel-docs +5 | 4.12.14-150.52.1 | SUSE-SU-2020:1663-1 |
| SUSE Real Time Module 15 SP1 | kernel-rt +3 | 4.12.14-14.20.1 | SUSE-SU-2020:0688-1 |
| SUSE OpenStack Cloud Crowbar 8 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SUSE OpenStack Cloud Crowbar 8 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
| SUSE OpenStack Cloud 8 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SUSE OpenStack Cloud 8 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
| SUSE OpenStack Cloud 7 | kernel-syms +2 | 4.4.121-92.129.1 | SUSE-SU-2020:1255-1 |
| SUSE OpenStack Cloud 7 | kgraft-patch-SLE12-SP2_Update_34 | 1-3.3.1 | SUSE-SU-2020:1255-1 |
| SUSE HPE Helion OpenStack 8 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SUSE HPE Helion OpenStack 8 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
| SUSE Enterprise Storage 5 | kernel-syms +2 | 4.4.180-94.116.1 | SUSE-SU-2020:1275-1 |
| SUSE Enterprise Storage 5 | kgraft-patch-SLE12-SP3_Update_31 | 1-4.3.1 | SUSE-SU-2020:1275-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | kernel-source | 5.14.6-1.4 | openSUSE-SU-2024:13704-1, openSUSE-SU-2024:10728-1 |
| openSUSE Leap 15.1 | kernel-docs +8 | 4.12.14-lp151.28.40.1 | openSUSE-SU-2020:0336-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.173-137.228 | 1.0-0.amzn2 | ALAS2-2020-1405 |
| Amazon Linux 2 | perf +8 | 4.14.173-137.228.amzn2 | ALAS2-2020-1405 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-193.1.2.el8_2 | ELSA-2020-2102 |
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-124.36.1.1.el7uek | ELSA-2020-5543, ELSA-2020-5542, ELSA-2020-5540 |
| Oracle Linux 7 | kernel-uek-tools +3 | 4.14.35-1902.10.8.el7uek | ELSA-2020-5540 |
| Oracle Linux 7 | perf +12 | 3.10.0-1160.el7 | ELSA-2020-5540, ELSA-2020-4060 |
Advisories 34
- RHSA-2020:4062 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2020:4060 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 9, 2026
- RHSA-2020:2171 Red Hat Security Advisory: kernel-rt security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2020:2102 Red Hat Security Advisory: kernel security and bug fix update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-4302-1 linux, linux-aws, linux-aws-hwe, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle, linux-raspi2, linux-snapdragon, linux-azure vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4301-1 linux-aws-5.0, linux-gcp, linux-gke-5.0, linux-oracle-5.0, linux-azure vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4300-1 linux, linux-aws, linux-gcp, linux-gcp-5.3, linux-gke-5.3, linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-raspi2-5.3, linux-azure, linux-azure-5.3 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4303-1 linux, linux-aws, linux-kvm vulnerability Ubuntu Security Notices (USN) · Jun 3, 2026
- USN-4303-2 linux-lts-xenial, linux-aws vulnerability Ubuntu Security Notices (USN) · Jun 3, 2026
- DSA-4667-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-4698-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2242-1 linux-4.9 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2241-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:0649-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1255-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0584-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:13704-1 kernel-devel-longterm-6.6.17-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0559-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0336-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1087-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0560-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0558-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1663-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1142-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0688-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10728-1 kernel-devel-5.14.6-1.4 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0667-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- SUSE-SU-2020:1275-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ALAS2-2020-1405 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Nov 29, 2023
- ELSA-2020-4060 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 6, 2020
- ELSA-2020-2102 Important: kernel security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · May 13, 2020
- ELSA-2020-5542 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 24, 2020
- ELSA-2020-5543 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 24, 2020
- ELSA-2020-5540 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Feb 24, 2020
References
- https://www.openwall.com/lists/oss-security/2020/02/25/3
- https://www.spinics.net/lists/kvm/msg208259.html
- https://git.kernel.org/linus/07721feee46b4b248402133228235318199b05ec
- https://git.kernel.org/linus/35a571346a94fb93b5b3b6a599675ef3384bc75c
- https://git.kernel.org/linus/e71237d3ff1abf9f3388337cfebf53b96df2020d
- https://bugzilla.redhat.com/show_bug.cgi?id=1805135
- 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
- DSA-4667 vendor-advisory
- [debian-lts-announce] 20200609 [SECURITY] [DLA 2241-1] linux security update mailing-list
- [debian-lts-announce] 20200610 [SECURITY] [DLA 2242-1] linux-4.9 security update mailing-list
- [debian-lts-announce] 20200610 [SECURITY] [DLA 2241-2] linux security update mailing-list
- DSA-4698 vendor-advisory