CVE-2018-1093

Published: 01 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 base score: 5.5

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-33.36)
Patches:
Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed by 7dac4a1726a9c64a517d595c40e95e2d0d135f6f
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1020.20)
linux-azure
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1022.23)
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)
linux-euclid
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

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

linux-gcp
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1018.19)
linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

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

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

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

linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(4.18.0-11.12~18.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1020.20)
linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

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

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

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

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

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

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

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

linux-oem
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1017.20)
linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1021.23)
linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (4.17~rc1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable