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)
|
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18397
- https://lore.kernel.org/lkml/20181126173452.26955-2-aarcange@redhat.com/
- https://ubuntu.com/security/notices/USN-3901-1
- https://ubuntu.com/security/notices/USN-3901-2
- https://ubuntu.com/security/notices/USN-3903-1
- https://ubuntu.com/security/notices/USN-3903-2
- NVD
- Launchpad
- Debian