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CVE-2018-1093

Published: 1 April 2018

The ext4_valid_block_bitmap function in fs/ext4/balloc.c in the Linux kernel through 4.15.15 allows attackers to cause a denial of service (out-of-bounds read and system crash) via a crafted ext4 image because balloc.c and ialloc.c do not validate bitmap block numbers.

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 (4.15.0-33.36)
upstream
Released (4.17~rc1)
artful Ignored
(end of life)
cosmic Not vulnerable
(4.17.0-6.7)
trusty
Released (3.13.0-157.207)
xenial
Released (4.4.0-128.154)
Patches:
Introduced by

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Fixed by 7dac4a1726a9c64a517d595c40e95e2d0d135f6f
linux-aws
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1020.20)
upstream
Released (4.17~rc1)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1020.20)
trusty
Released (4.4.0-1023.23)
xenial
Released (4.4.0-1061.70)
linux-azure
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1022.23)
upstream
Released (4.17~rc1)
artful Does not exist

cosmic Not vulnerable
(4.18.0-1003.3)
trusty Not vulnerable
(4.15.0-1023.24~14.04.1)
xenial
Released (4.15.0-1022.22~16.04.1)
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 (4.15.0-1022.23)
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 (4.15.0-1018.19)
upstream
Released (4.17~rc1)
artful Does not exist

cosmic Not vulnerable
(4.15.0-1018.19)
trusty Does not exist

xenial
Released (4.15.0-1018.19~16.04.2)
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-goldfish
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
(end of life, was needed)
linux-grouper
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 Does not exist

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 (4.15.0-33.36~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Not vulnerable
(4.18.0-11.12~18.04.1)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.17~rc1)
xenial
Released (4.15.0-33.36~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (4.15.0-1020.20)
cosmic Not vulnerable
(4.15.0-1020.20)
trusty Does not exist

upstream
Released (4.17~rc1)
xenial
Released (4.4.0-1027.32)
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-lts-xenial
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty
Released (4.4.0-128.154~14.04.1)
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 (4.15.0-1017.20)
cosmic Not vulnerable
(4.15.0-1017.20)
trusty Does not exist

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

upstream
Released (4.17~rc1)
xenial
Released (4.4.0-1091.99)
linux-snapdragon
Launchpad, Ubuntu, Debian
artful
Released (4.4.0-1094.99)
bionic Not vulnerable

cosmic Does not exist

trusty Does not exist

upstream
Released (4.17~rc1)
xenial
Released (4.4.0-1094.99)

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