CVE-2018-15594

Published: 20 August 2018

arch/x86/kernel/paravirt.c in the Linux kernel before 4.18.1 mishandles certain indirect calls, which makes it easier for attackers to conduct Spectre-v2 attacks against paravirtual guests.

From the Ubuntu Security Team

It was discovered that the paravirtualization implementation in the Linux kernel did not properly handle some indirect calls, reducing the effectiveness of Spectre v2 mitigations for paravirtual guests. A local attacker could use this to expose sensitive information.

Priority

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package	Release	Status
linux Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-36.39)
	cosmic	Not vulnerable (4.17.0-9.10)
	trusty	Released (3.13.0-160.210)
	upstream	Released (4.19~rc1)
	xenial	Released (4.4.0-137.163)
	Patches: Introduced by 3010a0663fd949d122eca0561b06b0a9453f7866 Fixed by 5800dc5c19f34e6e03b5adab1282535cb102fafd
linux-aws Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1023.23)
	cosmic	Not vulnerable (4.18.0-1002.3)
	trusty	Released (4.4.0-1031.34)
	upstream	Released (4.19~rc1)
	xenial	Released (4.4.0-1069.79)
linux-azure Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1025.26)
	cosmic	Not vulnerable (4.18.0-1003.3)
	trusty	Released (4.15.0-1030.31~14.04.1)
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-1025.26~16.04.1)
linux-azure-edge Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.18.0-1004.4~18.04.1)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-1025.26)
linux-euclid Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Not vulnerable
linux-flo Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	xenial	Ignored (abandoned)
linux-gcp Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1021.22)
	cosmic	Not vulnerable (4.18.0-1002.3)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-1021.22~16.04.1)
linux-gke Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Ignored (end of standard support)
linux-goldfish Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist (trusty was ignored [abandoned])
	upstream	Released (4.19~rc1)
	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 (4.19~rc1)
	xenial	Does not exist
linux-hwe Launchpad, Ubuntu, Debian	bionic	Not vulnerable
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-36.39~16.04.1)
linux-hwe-edge Launchpad, Ubuntu, Debian	bionic	Not vulnerable (4.18.0-11.12~18.04.1)
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.15.0-36.39~16.04.1)
linux-kvm Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1023.23)
	cosmic	Not vulnerable (4.18.0-1002.2)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.4.0-1035.41)
linux-lts-trusty Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	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 [end of standard support])
	upstream	Released (4.19~rc1)
	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 [end of standard support])
	upstream	Released (4.19~rc1)
	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 [end of standard support])
	upstream	Released (4.19~rc1)
	xenial	Does not exist
linux-lts-xenial Launchpad, Ubuntu, Debian	bionic	Does not exist
	cosmic	Does not exist
	trusty	Released (4.4.0-137.163~14.04.1)
	upstream	Released (4.19~rc1)
	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 (4.19~rc1)
	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 (4.19~rc1)
	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 (4.19~rc1)
	xenial	Does not exist
linux-oem Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1021.24)
	cosmic	Not vulnerable (4.15.0-1021.24)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Ignored (end of standard support, was needed)
linux-raspi2 Launchpad, Ubuntu, Debian	bionic	Released (4.15.0-1024.26)
	cosmic	Not vulnerable (4.18.0-1004.6)
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.4.0-1098.106)
linux-snapdragon Launchpad, Ubuntu, Debian	bionic	Not vulnerable
	cosmic	Does not exist
	trusty	Does not exist
	upstream	Released (4.19~rc1)
	xenial	Released (4.4.0-1102.107)

Severity score breakdown

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

References

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