CVE-2018-1092

Published: 01 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 base score: 5.5

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-23.25)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (4.4.0-128.154)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (3.13.0-157.207)
Patches:
Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed by 8e4b5eae5decd9dfe5a4ee369c22028f90ab4c44
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1010.10)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (4.4.0-1061.70)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.4.0-1023.23)
linux-azure
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1013.13)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (4.15.0-1013.13~16.04.2)
Ubuntu 14.04 ESM (Trusty Tahr) Not vulnerable
(4.15.0-1023.24~14.04.1)
linux-azure-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(4.18.0-1003.3~18.04.1)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (4.15.0-1013.13)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-euclid
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Ignored
(was needs-triage ESM criteria)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Ignored
(abandoned)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-gcp
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1009.9)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (4.13.0-1019.23)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Ignored
(was needed now end-of-life)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Ignored
(was needed now end-of-life)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable

Ubuntu 16.04 LTS (Xenial Xerus)
Released (4.13.0-45.50~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(4.18.0-8.9~18.04.1)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (4.13.0-45.50~16.04.1)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-kvm
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1011.11)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (4.4.0-1027.32)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [out of standard support])
linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [out of standard support])
linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [out of standard support])
linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr)
Released (4.4.0-128.154~14.04.1)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Ignored
(abandoned)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

Ubuntu 16.04 LTS (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was ignored [abandoned])
linux-oem
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1008.11)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (4.13.0-1030.33)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1012.13)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (4.4.0-1091.99)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable

Ubuntu 16.04 LTS (Xenial Xerus)
Released (4.4.0-1094.99)
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist