CVE-2017-12188

Published: 11 October 2017

arch/x86/kvm/mmu.c in the Linux kernel through 4.13.5, when nested virtualisation is used, does not properly traverse guest pagetable entries to resolve a guest virtual address, which allows L1 guest OS users to execute arbitrary code on the host OS or cause a denial of service (incorrect index during page walking, and host OS crash), aka an "MMU potential stack buffer overrun."

From the Ubuntu Security Team

It was discovered that the KVM subsystem in the Linux kernel did not properly keep track of nested levels in guest page tables. A local attacker in a guest VM could use this to cause a denial of service (host OS crash) or possibly execute arbitrary code in the host OS.

Notes

Author	Note
sbeattie	fd19d3b45164466a4adce7cbff448ba9189e1427 might not be strictly necessary

Priority

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	artful	Released (4.13.0-17.20)
	trusty	Not vulnerable
	upstream	Released (4.14~rc5)
	xenial	Not vulnerable
	zesty	Released (4.10.0-40.44)
	Patches: Introduced by 6bb69c9b69c315200ddc2bc79aee14c0184cf5b2 Fixed by 829ee279aed43faa5cb1e4d65c0cad52f2426c53 Introduced by 6bb69c9b69c315200ddc2bc79aee14c0184cf5b2 Fixed by fd19d3b45164466a4adce7cbff448ba9189e1427
linux-armadaxp Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	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
	upstream	Released (4.14~rc5)
	xenial	Not vulnerable
	zesty	Does not exist
linux-azure Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Not vulnerable (4.15.0-1023.24~14.04.1)
	upstream	Released (4.14~rc5)
	xenial	Released (4.11.0-1015.15)
	zesty	Does not exist
linux-euclid Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Not vulnerable
	zesty	Does not exist
linux-flo Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.14~rc5)
	xenial	Ignored (abandoned)
	zesty	Does not exist
linux-gcp Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Released (4.10.0-1009.9)
	zesty	Does not exist
linux-gke Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Not vulnerable
	zesty	Does not exist
linux-goldfish Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.14~rc5)
	xenial	Not vulnerable
	zesty	Not vulnerable
linux-grouper Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Released (4.10.0-40.44~16.04.1)
	zesty	Does not exist
linux-hwe-edge Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Released (4.10.0-40.44~16.04.1)
	zesty	Does not exist
linux-kvm Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Not vulnerable
	zesty	Does not exist
linux-linaro-omap Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-linaro-shared Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-linaro-vexpress Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-lts-quantal Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	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
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-lts-saucy Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	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
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Ignored (end of life, was needs-triage)
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [end of standard support])
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Not vulnerable
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-mako Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.14~rc5)
	xenial	Ignored (abandoned)
	zesty	Does not exist
linux-manta Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-oem Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Not vulnerable (4.13.0-1008.9)
	zesty	Does not exist
linux-qcm-msm Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist
linux-raspi2 Launchpad, Ubuntu, Debian	artful	Released (4.13.0-1006.6)
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Not vulnerable
	zesty	Released (4.10.0-1021.24)
linux-snapdragon Launchpad, Ubuntu, Debian	artful	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Not vulnerable
	zesty	Not vulnerable
linux-ti-omap4 Launchpad, Ubuntu, Debian	artful	Does not exist
	trusty	Does not exist
	upstream	Released (4.14~rc5)
	xenial	Does not exist
	zesty	Does not exist

Severity score breakdown

Parameter	Value
Base score	7.8
Attack vector	Local
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Changed
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

References

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