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CVE-2018-10877

Published: 18 July 2018

Linux kernel ext4 filesystem is vulnerable to an out-of-bound access in the ext4_ext_drop_refs() function when operating on a crafted ext4 filesystem image.

From the Ubuntu Security Team

Wen Xu discovered that a buffer overflow existed in the ext4 filesystem implementation in the Linux kernel. An attacker could use this to construct a malicious ext4 image that, when mounted, could cause a denial of service (system crash) or possibly execute arbitrary code.

Notes

AuthorNote
sbeattie
possible reproducer in bug report
fs/ext4/extents.c

Priority

Low

Cvss 3 Severity Score

6.5

Score breakdown

Status

Package Release Status
linux-aws
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (4.15.0-1032.34)
cosmic Not vulnerable
(4.18.0-1002.3)
trusty
Released (4.4.0-1028.31)
upstream
Released (4.18~rc4)
xenial
Released (4.4.0-1066.76)
linux-azure
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (4.15.0-1037.39)
cosmic Not vulnerable
(4.18.0-1003.3)
trusty
Released (4.15.0-1037.39~14.04.2)
upstream
Released (4.18~rc4)
xenial
Released (4.15.0-1037.39~16.04.1)
linux-aws-hwe
Launchpad, Ubuntu, Debian
bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.18~rc4)
xenial
Released (4.15.0-1032.34~16.04.1)
linux-gcp-edge
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(4.18.0-1004.5~18.04.1)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.18~rc4)
xenial Does not exist

linux
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic
Released (4.15.0-44.47)
cosmic Not vulnerable
(4.17.0-6.7)
trusty
Released (3.13.0-157.207)
upstream
Released (4.18~rc4)
xenial
Released (4.4.0-134.160)
Patches:
Introduced by

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2

Fixed by bc890a60247171294acc0bd67d211fa4b88d40ba
linux-azure-edge
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (4.15.0-1037.39)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.18~rc4)
xenial
Released (4.15.0-1037.39~16.04.1)
linux-euclid
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.18~rc4)
xenial Ignored
(was needed ESM criteria)
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 (4.18~rc4)
xenial Ignored
(abandoned)
linux-gcp
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (4.15.0-1027.28)
cosmic Not vulnerable
(4.18.0-1002.3)
trusty Does not exist

upstream
Released (4.18~rc4)
xenial
Released (4.15.0-1027.28~16.04.1)
linux-gke
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.18~rc4)
xenial Ignored
(end of standard support)
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 (4.18~rc4)
xenial Ignored
(end of life)
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 (4.18~rc4)
xenial Does not exist

linux-hwe
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Not vulnerable
(4.18.0-13.14~18.04.1)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.18~rc4)
xenial
Released (4.15.0-45.48~16.04.1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Not vulnerable
(5.0.0-8.9~18.04.1)
cosmic Does not exist

trusty Does not exist

upstream
Released (4.18~rc4)
xenial
Released (4.15.0-45.48~16.04.1)
linux-kvm
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (4.15.0-1029.29)
cosmic Not vulnerable
(4.18.0-1002.2)
trusty Does not exist

upstream
Released (4.18~rc4)
xenial
Released (4.4.0-1032.38)
linux-lts-trusty
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty Does not exist

upstream
Released (4.18~rc4)
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 (4.18~rc4)
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 (4.18~rc4)
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 (4.18~rc4)
xenial Does not exist

linux-lts-xenial
Launchpad, Ubuntu, Debian
artful Does not exist

bionic Does not exist

cosmic Does not exist

trusty
Released (4.4.0-134.160~14.04.1)
upstream
Released (4.18~rc4)
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 (4.18~rc4)
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 (4.18~rc4)
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 (4.18~rc4)
xenial Does not exist

linux-oem
Launchpad, Ubuntu, Debian
artful Does not exist

bionic
Released (4.15.0-1033.38)
cosmic
Released (4.15.0-1033.38)
trusty Does not exist

upstream
Released (4.18~rc4)
xenial Ignored
(end of standard support, was needed)
linux-oracle
Launchpad, Ubuntu, Debian
bionic
Released (4.15.0-1008.10)
cosmic Not vulnerable

trusty Does not exist

upstream
Released (4.18~rc4)
xenial
Released (4.15.0-1008.10~16.04.1)
linux-raspi2
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic
Released (4.15.0-1031.33)
cosmic Not vulnerable
(4.18.0-1004.6)
trusty Does not exist

upstream
Released (4.18~rc4)
xenial
Released (4.4.0-1095.103)
linux-snapdragon
Launchpad, Ubuntu, Debian
artful Ignored
(end of life)
bionic Not vulnerable

cosmic Does not exist

trusty Does not exist

upstream
Released (4.18~rc4)
xenial
Released (4.4.0-1099.104)

Severity score breakdown

Parameter Value
Base score 6.5
Attack vector Local
Attack complexity Low
Privileges required High
User interaction Required
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:H/UI:R/S:U/C:H/I:H/A:H