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CVE-2018-1092

Published: 1 April 2018

The ext4_iget function in fs/ext4/inode.c in the Linux kernel through 4.15.15 mishandles the case of a root directory with a zero i_links_count, which allows attackers to cause a denial of service (ext4_process_freed_data NULL pointer dereference and OOPS) 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 handle corrupted meta data in some situations. An attacker could use this to specially craft an ext4 filesystem that caused a denial of service (system crash) when mounted.

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-23.25)
upstream
Released (4.17~rc1)
artful
Released (4.13.0-45.50)
cosmic Not vulnerable
(4.15.0-23.25)
trusty
Released (3.13.0-157.207)
xenial
Released (4.4.0-128.154)
Patches:
Introduced by

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Fixed by 8e4b5eae5decd9dfe5a4ee369c22028f90ab4c44
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1010.10)
upstream
Released (4.17~rc1)
trusty
Released (4.4.0-1023.23)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1010.10)
xenial
Released (4.4.0-1061.70)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1013.13)
upstream
Released (4.17~rc1)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1013.13)
trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
xenial
Released (4.15.0-1013.13~16.04.2)
linux-azure-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-1003.3~18.04.1)
upstream
Released (4.17~rc1)
cosmic Does not exist

trusty Does not exist

xenial
Released (4.15.0-1013.13)
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-flo
Launchpad, Ubuntu, Debian
bionic Does not exist

upstream
Released (4.17~rc1)
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Ignored
(abandoned)
linux-gcp
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1009.9)
upstream
Released (4.17~rc1)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1009.9)
trusty Does not exist

xenial
Released (4.13.0-1019.23)
linux-goldfish
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Ignored
(end of life, was needed)
bionic Does not exist

upstream
Released (4.17~rc1)
linux-grouper
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [abandoned])
xenial Does not exist

bionic Does not exist

upstream
Released (4.17~rc1)
linux-lts-trusty
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist

xenial Does not exist

bionic Does not exist

upstream
Released (4.17~rc1)
linux-lts-utopic
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
xenial Does not exist

bionic Does not exist

upstream
Released (4.17~rc1)
linux-lts-vivid
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty Does not exist
(trusty was ignored [end of standard support])
xenial Does not exist

bionic Does not exist

upstream
Released (4.17~rc1)
linux-lts-wily
Launchpad, Ubuntu, Debian
trusty Does not exist
(trusty was ignored [end of standard support])
artful Does not exist

cosmic Does not exist

xenial Does not exist

bionic Does not exist

upstream
Released (4.17~rc1)
linux-lts-xenial
Launchpad, Ubuntu, Debian
artful Does not exist

cosmic Does not exist

trusty
Released (4.4.0-128.154~14.04.1)
xenial Does not exist

bionic Does not exist

upstream
Released (4.17~rc1)
linux-snapdragon
Launchpad, Ubuntu, Debian
artful
Released (4.4.0-1094.99)
cosmic Does not exist

trusty Does not exist

xenial
Released (4.4.0-1094.99)
bionic Not vulnerable

upstream
Released (4.17~rc1)
linux-gke
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 Ignored
(end of standard support, was needed)
linux-hwe
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Not vulnerable

cosmic Does not exist

trusty Does not exist

upstream
Released (4.17~rc1)
xenial
Released (4.13.0-45.50~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Not vulnerable
(4.18.0-8.9~18.04.1)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.17~rc1)
xenial
Released (4.13.0-45.50~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (4.15.0-1011.11)
cosmic Not vulnerable
(4.15.0-1011.11)
trusty Does not exist

upstream
Released (4.17~rc1)
xenial
Released (4.4.0-1027.32)
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 (4.15.0-1008.11)
cosmic Not vulnerable
(4.15.0-1008.11)
trusty Does not exist

upstream
Released (4.17~rc1)
xenial
Released (4.13.0-1030.33)
linux-raspi2
Launchpad, Ubuntu, Debian
artful
Released (4.13.0-1022.23)
bionic
Released (4.15.0-1012.13)
cosmic Not vulnerable
(4.15.0-1021.23)
trusty Does not exist

upstream
Released (4.17~rc1)
xenial
Released (4.4.0-1091.99)

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:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H