Description
The prepare_vmcs02 function in arch/x86/kvm/vmx.c in the Linux kernel through 4.13.3 does not ensure that the "CR8-load exiting" and "CR8-store exiting" L0 vmcs02 controls exist in cases where L1 omits the "use TPR shadow" vmcs12 control, which allows KVM L2 guest OS users to obtain read and write access to the hardware CR8 register.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Linux kernel through 4.13.3 | Linux kernel through 4.13.3 | — |
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 | 4.12.13-1 | — |
| Debian 13 | linux | 4.12.13-1 | — |
| Debian 12 | linux | 4.12.13-1 | — |
| Debian 9 | linux | 4.9.30-2+deb9u5 | DSA-3981-1 |
| Debian 8 | linux | 3.16.43-2+deb8u5 | DSA-3981-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 7 | linux | 3.2.93-1 | DLA-1099-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-gcp-6.11 +4 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +2 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +3 | No fix yet | — |
| Ubuntu 16.04 LTS | linux | 4.4.0-98.121 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-aws | 4.4.0-1039.48 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-azure | 4.13.0-1005.7 | — |
| Ubuntu 16.04 LTS | linux-gcp | 4.13.0-1002.5 | — |
| Ubuntu 16.04 LTS | linux-gke | 4.4.0-1033.33 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-hwe | 4.13.0-32.35~16.04.1 | — |
| Ubuntu 16.04 LTS | linux-kvm | 4.4.0-1009.14 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-raspi2 | 4.4.0-1076.84 | USN-3469-1 |
| Ubuntu 16.04 LTS | linux-snapdragon | 4.4.0-1078.83 | USN-3469-1 |
| Ubuntu 14.04 LTS | linux | 3.13.0-153.203 | USN-3698-1 |
| Ubuntu 14.04 LTS | linux-lts-xenial | 4.4.0-98.121~14.04.1 | USN-3469-2 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | linux-azure-fde-5.15 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | kernel-rt +10 | 3.10.0-862.rt56.804.el7 | RHSA-2018:0676 |
| RHEL 7 | perf +18 | 3.10.0-862.el7 | RHSA-2018:1062 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7.4 EUS | perf +18 | 3.10.0-693.55.1.el7 | RHSA-2019:1946 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | kernel-docs | 4.4.92-6.18.3 | SUSE-SU-2017:2847-1 |
| SLES 12 SP3 | kernel-syms +3 | 4.4.92-6.18.1 | SUSE-SU-2017:2847-1 |
| SLES 12 SP2 | kernel-docs | 4.4.90-92.45.3 | SUSE-SU-2017:2869-1 |
| SLES 12 SP2 | kernel-syms +3 | 4.4.90-92.45.1 | SUSE-SU-2017:2869-1 |
| SLES 12 SP1 | kernel-xen +3 | 3.12.74-60.64.63.1 | SUSE-SU-2017:2908-1 |
| SLES 12 SP1 | kgraft-patch-SLE12-SP1_Update_22 | 1-2.1 | SUSE-SU-2017:2908-1 |
| SLES 12 | kernel-ec2 +4 | 3.12.61-52.101.1 | SUSE-SU-2017:2920-1, SUSE-SU-2017:2908-1 |
| SLES 12 | kgraft-patch-SLE12_Update_28 | 1-8.1 | SUSE-SU-2017:2920-1 |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP3 | kernel-syms +2 | 4.4.92-6.18.1 | SUSE-SU-2017:2847-1 |
| SLES for SAP 12 SP2 | kernel-syms +2 | 4.4.90-92.45.1 | SUSE-SU-2017:2869-1 |
| SLES for SAP 12 SP1 | kernel-xen +3 | 3.12.74-60.64.63.1 | SUSE-SU-2017:2908-1 |
| SLES for SAP 12 SP1 | kgraft-patch-SLE12-SP1_Update_22 | 1-2.1 | SUSE-SU-2017:2908-1 |
| SLE Real Time 12 SP2 | kernel-rt +3 | 4.4.88-18.1 | SUSE-SU-2017:2956-1 |
| SLE Live Patching 12 SP3 | kgraft-patch-SLE12-SP3_Update_4 | 1-4.3 | SUSE-SU-2017:2847-1 |
| SLE Live Patching 12 | kgraft-patch-SLE12-SP2_Update_14 | 1-2.4 | SUSE-SU-2017:2869-1 |
| SUSE OpenStack Cloud 6 | kernel-xen +3 | 3.12.74-60.64.63.1 | SUSE-SU-2017:2908-1 |
| SUSE OpenStack Cloud 6 | kgraft-patch-SLE12-SP1_Update_22 | 1-2.1 | SUSE-SU-2017:2908-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | kernel-uek +5 | 4.1.12-103.9.2.el7uek | ELSA-2017-3635 |
| Oracle Linux 7 | perf +11 | 3.10.0-862.el7 | ELSA-2018-1062 |
Advisories 15
- RHSA-2019:1946 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jul 1, 2026
- RHSA-2018:1062 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- RHSA-2018:0676 Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 29, 2026
- USN-3698-1 linux vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- USN-3469-1 linux, linux-aws, linux-gke, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3981-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1099-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3469-2 linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2017:2956-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2908-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2920-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2869-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:2847-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · May 2, 2025
- ELSA-2018-1062 Important: kernel security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 16, 2018
- ELSA-2017-3635 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Nov 2, 2017
References
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=51aa68e7d57e3217192d88ce90fd5b8ef29ec94f
- https://bugzilla.redhat.com/show_bug.cgi?id=1491224
- RHSA-2018:1062 vendor-advisory
- 100856 vdb-entry
- DSA-3981 vendor-advisory
- https://www.spinics.net/lists/kvm/msg155414.html
- RHSA-2018:0676 vendor-advisory
- USN-3698-1 vendor-advisory
- https://github.com/torvalds/linux/commit/51aa68e7d57e3217192d88ce90fd5b8ef29ec94f
- USN-3698-2 vendor-advisory
- RHSA-2019:1946 vendor-advisory