CVE-2018-19407

Published: 20 November 2018

The vcpu_scan_ioapic function in arch/x86/kvm/x86.c in the Linux kernel through 4.19.2 allows local users to cause a denial of service (NULL pointer dereference and BUG) via crafted system calls that reach a situation where ioapic is uninitialized.

From the Ubuntu Security Team

Wei Wu discovered that the KVM implementation in the Linux kernel did not properly ensure that ioapics were initialized. A local attacker could use this to cause a denial of service (system crash).

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-44.47)
	cosmic	Released (4.18.0-14.15)
	trusty	Not vulnerable (3.11.0-12.19)
	upstream	Released (4.20~rc5)
	xenial	Released (4.4.0-142.168)
	Patches: Introduced by 5c919412fe61c35947816fdbd5f7bd09fe0dd073 Fixed by e97f852fd4561e77721bb9a4e0ea9d98305b1e93
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1032.34)
	cosmic	Released (4.18.0-1008.10)
	trusty	Released (4.4.0-1038.41)
	upstream	Released (4.20~rc5)
	xenial	Released (4.4.0-1075.85)
linux-aws-hwe Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Released (4.15.0-1032.34~16.04.1)
linux-azure Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1037.39)
	cosmic	Released (4.18.0-1008.8)
	trusty	Released (4.15.0-1037.39~14.04.2)
	upstream	Released (4.20~rc5)
	xenial	Released (4.15.0-1037.39~16.04.1)
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1037.39)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Released (4.15.0-1037.39~16.04.1)
linux-euclid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Ignored (was needs-triage ESM criteria)
linux-flo Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.20~rc5)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1027.28)
	cosmic	Released (4.18.0-1006.7)
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Released (4.15.0-1027.28~16.04.1)
linux-gcp-edge Launchpad, Ubuntu, Debian	bionic	Released (4.18.0-1006.7~18.04.1)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Does not exist
linux-gke Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Ignored (end-of-life)
linux-goldfish Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.20~rc5)
	xenial	Ignored (end-of-life)
linux-grouper Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.20~rc5)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Released (4.18.0-14.15~18.04.1)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Released (4.15.0-45.48~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Not vulnerable (5.0.0-8.9~18.04.1)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Released (4.15.0-45.48~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1029.29)
	cosmic	Released (4.18.0-1007.7)
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Released (4.4.0-1040.46)
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Does not exist
linux-lts-utopic Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [out of standard support])
	upstream	Released (4.20~rc5)
	xenial	Does not exist
linux-lts-vivid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [out of standard support])
	upstream	Released (4.20~rc5)
	xenial	Does not exist
linux-lts-wily Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [out of standard support])
	upstream	Released (4.20~rc5)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Released (4.4.0-142.168~14.04.1)
	upstream	Released (4.20~rc5)
	xenial	Does not exist
linux-maguro Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.20~rc5)
	xenial	Does not exist
linux-mako Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.20~rc5)
	xenial	Ignored (abandoned)
linux-manta Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.20~rc5)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1033.38)
	cosmic	Released (4.15.0-1033.38)
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Ignored (was needs-triage now end-of-life)
linux-oracle Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1008.10)
	cosmic	Not vulnerable
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Released (4.15.0-1008.10~16.04.1)
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1031.33)
	cosmic	Released (4.18.0-1009.11)
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Released (4.4.0-1103.111)
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Not vulnerable
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.20~rc5)
	xenial	Released (4.4.0-1107.112)

Severity score breakdown

Parameter	Value
Base score	5.5
Attack vector	Local
Attack complexity	Low
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

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