CVE-2019-6974

Published: 15 February 2019

In the Linux kernel before 4.20.8, kvm_ioctl_create_device in virt/kvm/kvm_main.c mishandles reference counting because of a race condition, leading to a use-after-free.

From the Ubuntu security team

Jann Horn discovered that the KVM implementation in the Linux kernel contained a use-after-free vulnerability. An attacker in a guest VM with access to /dev/kvm could use this to cause a denial of service (guest VM crash).

Priority

Medium

CVSS 3 base score: 8.1

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-47.50)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-145.171)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (3.13.0-168.218)
Patches:
Introduced by 852b6d57dc7fa378019786fa84727036e56839ea
Fixed by cfa39381173d5f969daf43582c95ad679189cbc9
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1035.37)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1079.89)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.4.0-1040.43)
linux-aws-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1035.37~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-azure
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.18.0-1014.14~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1041.45)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.15.0-1041.45~14.04.1)
linux-azure-edge
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.18.0-1014.14~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1041.45)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-euclid
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(was needed ESM criteria)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(abandoned)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-gcp
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1029.31)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1029.31~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.18.0-1008.9~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(end-of-life)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(end-of-life)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.18.0-17.18~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-47.50~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(5.0.0-15.16~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-47.50~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1031.31)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1043.49)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [end-of-life])
linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [end-of-life])
linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [end-of-life])
linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.4.0-144.170~14.04.1)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(abandoned)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-oem
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1035.40)
Ubuntu 16.04 ESM (Xenial Xerus) Ignored
(was needs-triage now end-of-life)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-oracle
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1010.12)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1010.12~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1033.35)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1106.114)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (5.0~rc6)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1053.57)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1110.115)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist