Your submission was sent successfully! Close

CVE-2018-18397

Published: 12 December 2018

The userfaultfd implementation in the Linux kernel before 4.19.7 mishandles access control for certain UFFDIO_ ioctl calls, as demonstrated by allowing local users to write data into holes in a tmpfs file (if the user has read-only access to that file, and that file contains holes), related to fs/userfaultfd.c and mm/userfaultfd.c.

From the Ubuntu security team

Jann Horn discovered that the userfaultd implementation in the Linux kernel did not properly restrict access to certain ioctls. A local attacker could use this possibly to modify files.

Priority

Medium

CVSS 3 base score: 5.5

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-46.49)
cosmic
Released (4.18.0-16.17)
precise Ignored
(was needs-triage ESM criteria)
trusty Not vulnerable
(3.11.0-12.19)
upstream
Released (4.20~rc5)
xenial Not vulnerable
(4.2.0-16.19)
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1033.35)
cosmic
Released (4.18.0-1011.13)
precise Does not exist

trusty Not vulnerable
(4.4.0-1002.2)
upstream
Released (4.20~rc5)
xenial Not vulnerable
(4.4.0-1001.10)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial
Released (4.15.0-1033.35~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1013.13~18.04.1)
cosmic
Released (4.18.0-1013.13)
precise Does not exist

trusty
Released (4.15.0-1040.44~14.04.1)
upstream
Released (4.20~rc5)
xenial
Released (4.15.0-1040.44)
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1013.13~18.04.1)
cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial
Released (4.15.0-1040.44)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial Ignored
(was needs-triage ESM criteria)
linux-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.20~rc5)
xenial Ignored
(abandoned)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1028.29)
cosmic
Released (4.18.0-1007.8)
precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial
Released (4.15.0-1028.29~16.04.1)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-1007.8~18.04.1)
cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial Ignored
(end-of-life)
linux-goldfish
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.20~rc5)
xenial Ignored
(end-of-life)
linux-grouper
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.20~rc5)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
bionic
Released (4.18.0-16.17~18.04.1)
cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial
Released (4.15.0-46.49~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(5.0.0-8.9~18.04.1)
cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial
Released (4.15.0-46.49~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1030.30)
cosmic
Released (4.18.0-1008.8)
precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial Not vulnerable
(4.4.0-1004.9)
linux-lts-trusty
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Ignored
(was needs-triage ESM criteria)
trusty Does not exist

upstream
Released (4.20~rc5)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [out of standard support])
upstream
Released (4.20~rc5)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [out of standard support])
upstream
Released (4.20~rc5)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [out of standard support])
upstream
Released (4.20~rc5)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Not vulnerable
(4.4.0-13.29~14.04.1)
upstream
Released (4.20~rc5)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.20~rc5)
xenial Does not exist

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

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.20~rc5)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

precise Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.20~rc5)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1034.39)
cosmic
Released (4.15.0-1034.39)
precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial Ignored
(was needs-triage now end-of-life)
linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1009.11)
cosmic Not vulnerable

precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial
Released (4.15.0-1009.11~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1032.34)
cosmic
Released (4.18.0-1010.12)
precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial Not vulnerable
(4.2.0-1013.19)
linux-snapdragon
Launchpad, Ubuntu, Debian
bionic Not vulnerable

cosmic Does not exist

precise Does not exist

trusty Does not exist

upstream
Released (4.20~rc5)
xenial Not vulnerable
(4.4.0-1012.12)