CVE-2018-12233

Published: 12 June 2018

In the ea_get function in fs/jfs/xattr.c in the Linux kernel through 4.17.1, a memory corruption bug in JFS can be triggered by calling setxattr twice with two different extended attribute names on the same file. This vulnerability can be triggered by an unprivileged user with the ability to create files and execute programs. A kmalloc call is incorrect, leading to slab-out-of-bounds in jfs_xattr.

From the Ubuntu security team

Shankara Pailoor discovered that the JFS filesystem implementation in the Linux kernel contained a buffer overflow when handling extended attributes. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.

Priority

Medium

CVSS 3 base score: 7.8

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-33.36)
Patches:
Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed by 92d34134193e5b129dc24f8d79cb9196626e8d7a
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1020.20)
linux-azure
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1022.23)
linux-azure-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(4.18.0-1003.3~18.04.1)
linux-euclid
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-gcp
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1018.19)
linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable

linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(4.18.0-11.12~18.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1020.20)
linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Does not exist

linux-oem
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1017.20)
linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (4.15.0-1021.23)
linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (4.18~rc2)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable