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CVE-2018-1094

Published: 1 April 2018

The ext4_fill_super function in fs/ext4/super.c in the Linux kernel through 4.15.15 does not always initialize the crc32c checksum driver, which allows attackers to cause a denial of service (ext4_xattr_inode_hash NULL pointer dereference and system crash) via a crafted ext4 image.

From the Ubuntu Security Team

Wen Xu discovered that the ext4 filesystem implementation in the Linux kernel did not properly initialize the crc32c checksum driver. A local attacker could use this to cause a denial of service (system crash).

Notes

AuthorNote
tyhicks
When backporting a45403b, note this upstream bug comment:
https://bugzilla.kernel.org/show_bug.cgi?id=199183#c7

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1011.11)
upstream
Released (4.17~rc1)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1011.11)
trusty Not vulnerable
(4.4.0-1002.2)
xenial Not vulnerable
(4.4.0-1001.10)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream
Released (4.17~rc1)
cosmic Does not exist

trusty Does not exist

xenial Not vulnerable
(4.15.0-1030.31~16.04.1)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1014.14)
upstream
Released (4.17~rc1)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1014.14)
trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
xenial
Released (4.15.0-1014.14~16.04.1)
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1014.14)
upstream
Released (4.17~rc1)
cosmic Does not exist

trusty Does not exist

xenial
Released (4.15.0-1014.14~16.04.1)
linux-euclid
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream
Released (4.17~rc1)
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Ignored
(was needs-triage ESM criteria)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1010.10)
upstream
Released (4.17~rc1)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1010.10)
trusty Does not exist

xenial
Released (4.15.0-1014.14~16.04.1)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-1004.5~18.04.1)
upstream
Released (4.17~rc1)
cosmic Does not exist

trusty Does not exist

xenial Does not exist

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

upstream
Released (4.17~rc1)
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Ignored
(end of standard support, was needed)
linux-hwe
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-13.14~18.04.1)
upstream
Released (4.17~rc1)
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial
Released (4.15.0-24.26~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-12.13~18.04.1)
upstream
Released (4.17~rc1)
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial
Released (4.15.0-24.26~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1012.12)
upstream
Released (4.17~rc1)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1012.12)
trusty Does not exist

xenial Not vulnerable
(4.4.0-1004.9)
linux-lts-xenial
Launchpad, Ubuntu, Debian
bionic Does not exist

artful Does not exist

cosmic Does not exist

trusty Not vulnerable
(4.4.0-13.29~14.04.1)
upstream
Released (4.17~rc1)
xenial Does not exist

linux
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic
Released (4.15.0-24.26)
cosmic Not vulnerable
(4.15.0-29.31)
trusty Not vulnerable
(3.11.0-12.19)
upstream
Released (4.17~rc1)
xenial Not vulnerable
(4.2.0-16.19)
Patches:
Introduced by

dec214d00e0d78a08b947d7dccdfdb84407a9f4d

Fixed by a45403b51582a87872927a3e0fc0a389c26867f1
linux-flo
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.17~rc1)
xenial Ignored
(abandoned)
linux-goldfish
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.17~rc1)
xenial Ignored
(end of life, was needed)
linux-grouper
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.17~rc1)
xenial Does not exist

linux-lts-trusty
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.17~rc1)
xenial Does not exist

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

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
upstream
Released (4.17~rc1)
xenial Does not exist

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

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
upstream
Released (4.17~rc1)
xenial Does not exist

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

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
upstream
Released (4.17~rc1)
xenial Does not exist

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

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.17~rc1)
xenial Does not exist

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

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.17~rc1)
xenial Ignored
(abandoned)
linux-manta
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
upstream
Released (4.17~rc1)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (4.15.0-1009.12)
cosmic Not vulnerable
(4.15.0-1009.12)
trusty Does not exist

upstream
Released (4.17~rc1)
xenial Ignored
(end of standard support, was needed)
linux-oracle
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.15.0-1007.9)
cosmic Not vulnerable

trusty Does not exist

upstream
Released (4.17~rc1)
xenial Not vulnerable
(4.15.0-1007.9~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic
Released (4.15.0-1013.14)
cosmic Not vulnerable
(4.15.0-1021.23)
trusty Does not exist

upstream
Released (4.17~rc1)
xenial Not vulnerable
(4.2.0-1013.19)
linux-snapdragon
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic Not vulnerable

cosmic Does not exist

trusty Does not exist

upstream
Released (4.17~rc1)
xenial Not vulnerable
(4.4.0-1012.12)

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H