CVE-2018-20856

Published: 26 July 2019

An issue was discovered in the Linux kernel before 4.18.7. In block/blk-core.c, there is an __blk_drain_queue() use-after-free because a certain error case is mishandled.

From the Ubuntu security team

It was discovered that a use-after-free error existed in the block layer subsystem of the Linux kernel when certain failure conditions occurred. A local attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Priority

Medium

CVSS 3 base score: 7.8

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-58.64)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-161.189)
Ubuntu 14.04 ESM (Trusty Tahr) Not vulnerable
(3.11.0-12.19)
Patches:
Introduced by 7c94e1c157a227837b04f02f5edeff8301410ba2
Fixed by 54648cf1ec2d7f4b6a71767799c45676a138ca24
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1047.49)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1092.103)
Ubuntu 14.04 ESM (Trusty Tahr) Ignored
(was needed ESM criteria)
linux-aws-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1047.49~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-azure
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.18.0-1011.11~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1055.60)
Ubuntu 14.04 ESM (Trusty Tahr) Ignored
(was needed ESM criteria)
linux-azure-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.18.0-1011.11~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1055.60)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-euclid
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

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

linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
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

linux-gcp
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1040.42)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1040.42~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-gcp-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1040.42)
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 (4.19~rc1)
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

linux-gke-4.15
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1040.42)
Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(5.0.0-1011.11~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
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

linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
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-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(4.18.0-13.14~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-58.64~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(5.0.0-15.16~18.04.1)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-58.64~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1042.42)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1056.63)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
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 (4.19~rc1)
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-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
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-wily
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
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-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Ignored
(was needed ESM criteria)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
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-mako
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
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

linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
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-oem
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1050.57)
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 (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1021.23)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.15.0-1021.23~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1043.46)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1120.129)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (4.19~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1060.66)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (4.4.0-1124.130)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist