CVE-2017-12154 Information

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.

CVSS Vector

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Reference

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=51aa68e7d57e3217192d88ce90fd5b8ef29ec94f http://www.debian.org/security/2017/dsa-3981 http://www.securityfocus.com/bid/100856 https://access.redhat.com/errata/RHSA-2018:0676 https://access.redhat.com/errata/RHSA-2018:1062 https://access.redhat.com/errata/RHSA-2019:1946 https://bugzilla.redhat.com/show_bug.cgi?id=1491224 https://github.com/torvalds/linux/commit/51aa68e7d57e3217192d88ce90fd5b8ef29ec94f https://usn.ubuntu.com/3698-1/ https://usn.ubuntu.com/3698-2/ https://www.spinics.net/lists/kvm/msg155414.html

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

NONE

Base Severity

7.1