CVE-2017-12154

Published: 26 September 2017

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.

From the Ubuntu Security Team

It was discovered that the nested KVM implementation in the Linux kernel in some situations did not properly prevent second level guests from reading and writing the hardware CR8 register. A local attacker in a guest could use this to cause a denial of service (system crash).

Priority

Cvss 3 Severity Score

7.1

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	artful	Released (4.13.0-17.20)
	trusty	Released (3.13.0-153.203)
	xenial	Released (4.4.0-98.121)
	zesty	Ignored (end of life)
	upstream	Released (4.14~rc1)
	bionic	Not vulnerable (4.13.0-17.20)
	Patches: Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Fixed by 51aa68e7d57e3217192d88ce90fd5b8ef29ec94f
linux-armadaxp Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-aws Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Not vulnerable (4.4.0-1002.2)
	xenial	Released (4.4.0-1039.48)
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Not vulnerable (4.15.0-1001.1)
linux-azure Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Not vulnerable (4.15.0-1023.24~14.04.1)
	xenial	Released (4.13.0-1005.7)
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Not vulnerable (4.15.0-1002.2)
linux-euclid Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Ignored (was needed ESM criteria)
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-flo Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Ignored (abandoned)
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-gcp Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.13.0-1002.5)
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Not vulnerable (4.15.0-1001.1)
linux-gke Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.4.0-1033.33)
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Ignored (end of life, was needed)
	zesty	Ignored (end of life)
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-grouper Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.13.0-26.29~16.04.2)
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Not vulnerable
linux-hwe-edge Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.13.0-26.29~16.04.2)
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Released (4.18.0-8.9~18.04.1)
linux-kvm Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Released (4.4.0-1009.14)
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Not vulnerable (4.15.0-1002.2)
linux-linaro-omap Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-linaro-shared Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-linaro-vexpress Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-lts-quantal Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-raring Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-lts-saucy Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
	This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Ignored (end of life, was needs-triage)
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	xenial	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
	zesty	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Released (4.4.0-98.121~14.04.1)
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-mako Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Ignored (abandoned)
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-manta Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-oem Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Not vulnerable (4.13.0-1008.9)
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Not vulnerable (4.15.0-1002.3)
linux-qcm-msm Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	artful	Released (4.13.0-1006.6)
	trusty	Does not exist
	xenial	Released (4.4.0-1076.84)
	zesty	Ignored (end of life)
	upstream	Released (4.14~rc1)
	bionic	Not vulnerable (4.13.0-1006.6)
linux-snapdragon Launchpad, Ubuntu, Debian	artful	Released (4.4.0-1078.83)
	trusty	Does not exist
	xenial	Released (4.4.0-1078.83)
	zesty	Released (4.4.0-1078.83)
	upstream	Released (4.14~rc1)
	bionic	Not vulnerable
linux-ti-omap4 Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	xenial	Does not exist
	zesty	Does not exist
	upstream	Released (4.14~rc1)
	bionic	Does not exist

Severity score breakdown

Parameter	Value
Base score	7.1
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	None
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

References

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