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CVE-2016-1576

Published: 22 February 2016

The overlayfs implementation in the Linux kernel through 4.5.2 does not properly restrict the mount namespace, which allows local users to gain privileges by mounting an overlayfs filesystem on top of a FUSE filesystem, and then executing a crafted setuid program.

From the Ubuntu Security Team

halfdog discovered that OverlayFS, when mounting on top of a FUSE mount, incorrectly propagated file attributes, including setuid. A local unprivileged attacker could use this to gain privileges.

Notes

AuthorNote
jdstrand
android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.10 and earlier preview kernels
linux-lts-saucy no longer receives official support
linux-lts-quantal no longer receives official support
sbeattie
precise does not allow unprivileged user namespaces, which is
what lets an unprivileged user exploit this vulnerability; however,
the issue of copying up setuid attributes still exists in the
overlayfs codebase here, but it is a much lower priority to fix
(needs root/CAP_SYS_ADMIN to exploit).

Priority

High

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty
Released (3.13.0-79.123)
upstream Needed

vivid
Released (3.19.0-51.57)
wily
Released (4.2.0-30.35)
xenial Not vulnerable
(4.4.0-8.23)
yakkety Not vulnerable
(4.8.0-14.15)
zesty Not vulnerable
(4.8.0-22.24)
Patches:
Introduced by

e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c|local-overlayfs-backport

Fixed by local-2016-1576-1|e9f57ebcba563e0cd532926cab83c92bb4d79360
Introduced by

e9be9d5e76e34872f0c37d72e25bc27fe9e2c54c|local-overlayfs-backport

Fixed by local-2016-1576-2
linux-armadaxp
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream Needed

This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Not vulnerable
(4.4.0-1002.2)
upstream Needed

xenial Not vulnerable
(4.4.0-1001.10)
yakkety Does not exist

zesty Does not exist

linux-flo
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
vivid Ignored
(end of life)
wily Ignored
(end of life)
xenial Ignored
(abandoned)
yakkety Ignored
(end of life)
zesty Does not exist

upstream Needed

linux-gke
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

upstream Needed

xenial Not vulnerable
(4.4.0-1003.3)
yakkety Does not exist

zesty Does not exist

linux-goldfish
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
vivid Ignored
(end of life)
wily Ignored
(end of life)
xenial Ignored
(abandoned)
yakkety Ignored
(end of life)
zesty Ignored
(end of life)
upstream Needed

linux-grouper
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream Needed

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

trusty Does not exist

upstream Needed

xenial Not vulnerable
(4.8.0-36.36~16.04.1)
yakkety Does not exist

zesty Does not exist

linux-hwe-edge
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

upstream Needed

xenial Not vulnerable
(4.8.0-36.36~16.04.1)
yakkety Does not exist

zesty Does not exist

linux-linaro-omap
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

upstream Needed

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

linux-linaro-shared
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

upstream Needed

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

linux-linaro-vexpress
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

upstream Needed

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

linux-lts-quantal
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream Needed

This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream Needed

linux-lts-saucy
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream Needed

This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
precise
Released (3.13.0-79.123~precise1)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream Needed

linux-lts-utopic
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (3.16.0-62.82~14.04.1)
upstream Needed

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

linux-lts-vivid
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (3.19.0-51.57~14.04.1)
upstream Needed

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

linux-lts-wily
Launchpad, Ubuntu, Debian
precise Does not exist

trusty
Released (4.2.0-30.35~14.04.1)
upstream Needed

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

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

trusty Not vulnerable
(4.4.0-13.29~14.04.1)
upstream Needed

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

linux-maguro
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream Needed

linux-mako
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
vivid Ignored
(end of life)
wily Ignored
(end of life)
xenial Ignored
(abandoned)
yakkety Ignored
(end of life)
zesty Does not exist

upstream Needed

linux-manta
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist
(trusty was ignored)
vivid Ignored
(end of life)
wily Ignored
(end of life)
xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream Needed

linux-qcm-msm
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

upstream Needed

linux-raspi2
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

upstream Needed

vivid Does not exist

wily
Released (4.2.0-1025.32)
xenial Not vulnerable
(4.4.0-1003.4)
yakkety Not vulnerable
(4.4.0-1009.10)
zesty Not vulnerable
(4.8.0-1013.15)
linux-snapdragon
Launchpad, Ubuntu, Debian
precise Does not exist

trusty Does not exist

upstream Needed

wily Does not exist

xenial Not vulnerable
(4.4.0-1012.12)
yakkety Not vulnerable
(4.4.0-1012.12)
zesty Not vulnerable
(4.4.0-1029.32)
linux-ti-omap4
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
trusty Does not exist

upstream Needed

vivid Does not exist

wily Does not exist

xenial Does not exist

yakkety Does not exist

zesty Does not exist

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H