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CVE-2018-18021

Published: 7 October 2018

arch/arm64/kvm/guest.c in KVM in the Linux kernel before 4.18.12 on the arm64 platform mishandles the KVM_SET_ON_REG ioctl. This is exploitable by attackers who can create virtual machines. An attacker can arbitrarily redirect the hypervisor flow of control (with full register control). An attacker can also cause a denial of service (hypervisor panic) via an illegal exception return. This occurs because of insufficient restrictions on userspace access to the core register file, and because PSTATE.M validation does not prevent unintended execution modes.

From the Ubuntu Security Team

It was discovered that the KVM implementation in the Linux kernel on ARM 64bit processors did not properly handle some ioctls. An attacker with the privilege to create KVM-based virtual machines could use this to cause a denial of service (host system crash) or execute arbitrary code in the host.

Priority

Medium

Cvss 3 Severity Score

7.1

Score breakdown

Status

Package Release Status
linux-aws
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(ARM64 only)
cosmic Not vulnerable
(4.18.0-1002.3)
trusty Not vulnerable
(ARM64 only)
upstream
Released (4.19~rc7)
xenial Not vulnerable
(ARM64 only)
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~rc7)
xenial Ignored
(abandoned)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.15.0-1035.37~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(ARM64 only)
cosmic Not vulnerable
(4.18.0-1003.3)
trusty Not vulnerable
(ARM64 only)
upstream
Released (4.19~rc7)
xenial Not vulnerable
(ARM64 only)
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-47.50)
cosmic Not vulnerable
(4.18.0-9.10)
trusty Ignored
(arm64 not supported in 14.04)
upstream
Released (4.19~rc7)
xenial
Released (4.4.0-139.165)
Patches:
Introduced by

0d854a60b1d7d39a37b25dd28f63cfa0df637b91

Fixed by 2a3f93459d689d990b3ecfbe782fec89b97d3279
Introduced by

2f4a07c5f9fe4a5cdb9867e1e2fcab3165846ea7

Fixed by d26c25a9d19b5976b319af528886f89cf455692d
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(ARM64 only)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial Not vulnerable
(ARM64 only)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial Ignored
(was needed ESM criteria)
linux-gcp
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(ARM64 only)
cosmic Not vulnerable
(4.18.0-1002.3)
trusty Does not exist

upstream
Released (4.19~rc7)
xenial Not vulnerable
(ARM64 only)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-1004.5~18.04.1)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial Does not exist

linux-gke
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
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~rc7)
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~rc7)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-13.14~18.04.1)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.15.0-47.50~16.04.1)
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 (4.19~rc7)
xenial
Released (4.15.0-47.50~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(ARM64 only)
cosmic Not vulnerable
(4.18.0-1003.3)
trusty Does not exist

upstream
Released (4.19~rc7)
xenial Not vulnerable
(ARM64 only)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
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~rc7)
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~rc7)
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~rc7)
xenial Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty
Released (4.4.0-139.165~14.04.1)
upstream
Released (4.19~rc7)
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~rc7)
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~rc7)
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~rc7)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(ARM64 only)
cosmic Not vulnerable
(ARM64 only)
trusty Does not exist

upstream
Released (4.19~rc7)
xenial Ignored
(end of standard support, was needs-triage)
linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1010.12)
cosmic Not vulnerable

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.15.0-1010.12~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1033.35)
cosmic Not vulnerable
(4.18.0-1005.7)
trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.4.0-1100.108)
linux-snapdragon
Launchpad, Ubuntu, Debian
bionic Not vulnerable

cosmic Does not exist

trusty Does not exist

upstream
Released (4.19~rc7)
xenial
Released (4.4.0-1104.109)

Severity score breakdown

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