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CVE-2014-5206

Published: 13 August 2014

The do_remount function in fs/namespace.c in the Linux kernel through 3.16.1 does not maintain the MNT_LOCK_READONLY bit across a remount of a bind mount, which allows local users to bypass an intended read-only restriction and defeat certain sandbox protection mechanisms via a "mount -o remount" command within a user namespace.

From the Ubuntu security team

Kenton Varda discovered a flaw with read-only bind mounds when used with user namespaces. An unprivileged local user could exploit this flaw to gain full write privileges to a mount that should be read only.

Priority

High

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
lucid Not vulnerable

precise Not vulnerable

trusty
Released (3.13.0-34.60)
upstream
Released (3.17~rc1)
utopic Not vulnerable
(3.16.0-8.13)
vivid Not vulnerable
(3.16.0-23.31)
wily Not vulnerable
(3.19.0-15.15)
Patches:
Introduced by

0c55cfc4166d9a0f38de779bd4d75a90afbe7734

Fixed by a6138db815df5ee542d848318e5dae681590fccd
Introduced by

0c55cfc4166d9a0f38de779bd4d75a90afbe7734

Fixed by 07b645589dcda8b7a5249e096fece2a67556f0f4
linux-armadaxp
Launchpad, Ubuntu, Debian
lucid Does not exist

precise Not vulnerable

trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-ec2
Launchpad, Ubuntu, Debian
lucid Not vulnerable

precise Does not exist

trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

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

precise Does not exist

trusty Does not exist
(trusty was ignored)
upstream
Released (3.17~rc1)
utopic Not vulnerable

vivid Not vulnerable

wily Not vulnerable

linux-fsl-imx51
Launchpad, Ubuntu, Debian
lucid Ignored
(reached end-of-life, does not affect buildd)
precise Does not exist

trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

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

precise Does not exist

trusty Does not exist
(trusty was ignored)
upstream
Released (3.17~rc1)
utopic Not vulnerable

vivid Not vulnerable

wily Not vulnerable

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

precise Does not exist

trusty Does not exist
(trusty was ignored)
upstream
Released (3.17~rc1)
utopic Ignored
(reached end-of-life)
vivid Does not exist

wily Does not exist

linux-linaro-omap
Launchpad, Ubuntu, Debian
lucid Does not exist

precise Ignored
(abandoned)
trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

linux-linaro-shared
Launchpad, Ubuntu, Debian
lucid Does not exist

precise Ignored
(abandoned)
trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

linux-linaro-vexpress
Launchpad, Ubuntu, Debian
lucid Does not exist

precise Ignored
(abandoned)
trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

linux-lts-quantal
Launchpad, Ubuntu, Debian
lucid Does not exist

precise Not vulnerable

trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

linux-lts-raring
Launchpad, Ubuntu, Debian
lucid Does not exist

precise Ignored
(was needs-triage now end-of-life)
trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

linux-lts-saucy
Launchpad, Ubuntu, Debian
lucid Does not exist

precise Ignored
(was pending [3.11.0-27.47~precise1] OEM release)
trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
lucid Does not exist

precise
Released (3.13.0-34.60~precise1)
trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

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

precise Does not exist

trusty Does not exist
(trusty was not-affected [3.16.0-25.33~14.04.2])
upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

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

precise Does not exist

trusty Does not exist
(trusty was not-affected [3.19.0-18.18~14.04.1])
upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

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

precise Does not exist

trusty Does not exist
(trusty was ignored)
upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

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

precise Does not exist

trusty Does not exist
(trusty was ignored)
upstream
Released (3.17~rc1)
utopic Not vulnerable

vivid Not vulnerable

wily Not vulnerable

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

precise Does not exist

trusty Does not exist
(trusty was ignored)
upstream
Released (3.17~rc1)
utopic Not vulnerable

vivid Not vulnerable

wily Not vulnerable

linux-mvl-dove
Launchpad, Ubuntu, Debian
lucid Ignored
(reached end-of-life)
precise Does not exist

trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

linux-qcm-msm
Launchpad, Ubuntu, Debian
lucid Ignored
(abandoned)
precise Ignored
(abandoned)
trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

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

trusty Does not exist

upstream
Released (3.17~rc1)
vivid Does not exist

wily Not vulnerable
(4.2.0-1008.12)
linux-ti-omap4
Launchpad, Ubuntu, Debian
lucid Does not exist

precise Not vulnerable

trusty Does not exist

upstream
Released (3.17~rc1)
utopic Does not exist

vivid Does not exist

wily Does not exist

Notes

AuthorNote
jdstrand
android kernels (goldfish, grouper, maguro, mako and manta) are not
supported on the Ubuntu Touch 13.10 preview kernels
android kernels (flo, goldfish, grouper, maguro, mako and manta) are
not supported on the Ubuntu Touch 14.04 preview kernels
apw
The existing break-fix appears to point to some self-tests
break-fix: - db181ce011e3c033328608299cd6fac06ea50130
actual fix appears to be: a6138db815df5ee542d848318e5dae681590fccd
jdstrand
linux-lts-saucy no longer receives official support

References