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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
bionic
Released (4.15.0-58.64)
disco Not vulnerable
(4.18.0-10.11)
precise Not vulnerable
(3.0.0-12.20)
trusty Not vulnerable
(3.11.0-12.19)
upstream
Released (4.19~rc1)
xenial
Released (4.4.0-161.189)
Patches:
Introduced by

7c94e1c157a227837b04f02f5edeff8301410ba2

Fixed by 54648cf1ec2d7f4b6a71767799c45676a138ca24
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1047.49)
disco Not vulnerable
(4.18.0-1002.3)
precise Does not exist

trusty Ignored
(was needed ESM criteria)
upstream
Released (4.19~rc1)
xenial
Released (4.4.0-1092.103)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.15.0-1047.49~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1011.11~18.04.1)
disco Not vulnerable
(4.18.0-1003.3)
precise Does not exist

trusty Ignored
(was needed ESM criteria)
upstream
Released (4.19~rc1)
xenial
Released (4.15.0-1055.60)
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1011.11~18.04.1)
disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.15.0-1055.60)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Ignored
(was needs-triage now end-of-life)
linux-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Ignored
(abandoned)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1040.42)
disco Not vulnerable
(4.18.0-1002.3)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.15.0-1040.42~16.04.1)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1040.42)
disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Does not exist

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

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Ignored
(end-of-life)
linux-gke-4.15
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1040.42)
disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Does not exist

linux-gke-5.0
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-1011.11~18.04.1)
disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Does not exist

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

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Ignored
(end-of-life)
linux-grouper
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Does not exist

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

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.15.0-58.64~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-15.16~18.04.1)
disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.15.0-58.64~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1042.42)
disco Not vulnerable
(4.18.0-1003.3)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.4.0-1056.63)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

precise Not vulnerable
(3.13.0-24.46~precise1)
trusty Does not exist

upstream
Released (4.19~rc1)
xenial Does not exist

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

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Does not exist

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

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Does not exist

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

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Does not exist

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

disco Does not exist

precise Does not exist

trusty Ignored
(was needed ESM criteria)
upstream
Released (4.19~rc1)
xenial Does not exist

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

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Does not exist

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

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
bionic Does not exist

disco Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1050.57)
disco
Released (4.15.0-1050.57)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial Ignored
(was needs-triage now end-of-life)
linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1021.23)
disco
Released (5.0.0-1004.8)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.15.0-1021.23~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1043.46)
disco Not vulnerable
(4.18.0-1005.7)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.4.0-1120.129)
linux-snapdragon
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1060.66)
disco Not vulnerable
(5.0.0-1010.10)
precise Does not exist

trusty Does not exist

upstream
Released (4.19~rc1)
xenial
Released (4.4.0-1124.130)