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CVE-2018-1095

Published: 1 April 2018

The ext4_xattr_check_entries function in fs/ext4/xattr.c in the Linux kernel through 4.15.15 does not properly validate xattr sizes, which causes misinterpretation of a size as an error code, and consequently allows attackers to cause a denial of service (get_acl NULL pointer dereference and system crash) via a crafted ext4 image.

From the Ubuntu Security Team

Wen Xu discovered that the ext4 file system implementation in the Linux kernel did not properly validate xattr sizes. A local attacker could use this to cause a denial of service (system crash).

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
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 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 (4.15.0-1014.14)
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-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 Not vulnerable

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

upstream
Released (4.17~rc1)
xenial Not vulnerable

Patches:
Introduced by

e50e5129f384ae282adebfb561189cdb19b81cee

Fixed by ce3fd194fcc6fbdc00ce095a852f22df97baa401
linux-aws
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (4.15.0-1011.11)
cosmic Not vulnerable
(4.15.0-1011.11)
trusty Not vulnerable

upstream
Released (4.17~rc1)
xenial Not vulnerable

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 Not vulnerable

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-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 (4.15.0-24.26~16.04.1)
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 (4.15.0-24.26~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
artful Does not exist

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

upstream
Released (4.17~rc1)
xenial Not vulnerable

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 Not vulnerable

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-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

linux-snapdragon
Launchpad, Ubuntu, Debian
artful Not vulnerable

bionic Not vulnerable

cosmic Does not exist

trusty Does not exist

upstream
Released (4.17~rc1)
xenial Not vulnerable

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