CVE-2017-12154

Kernel: kvm: nVMX: L2 guest could access hardware(L0) CR8 register

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Severity

Important

Red Hat Product Security

5.8

CVSS 3.0

Review impact separately from score.

Published · September 12, 2017

Updated · June 28, 2026

Description

Linux kernel built with the KVM visualization support (CONFIG_KVM), with nested visualization (nVMX) feature enabled (nested=1), is vulnerable to a crash due to disabled external interrupts. As L2 guest could access (r/w) hardware CR8 register of the host(L0). In a nested visualization setup, L2 guest user could use this flaw to potentially crash the host(L0) resulting in DoS.

Statement

This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 5.8
CVSS:3.0/AV:A/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H

CVSS 2.0 · 4.3
AV:A/AC:H/Au:S/C:N/I:N/A:C

CWE-284 · Improper Access Control