CVE-2014-5206

Priority
High
Description
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.
Ubuntu-Description
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.
References
Bugs
Notes
jdstrand> android kernels (goldfish, grouper, maguro, mako and manta) are not
supported on the Ubuntu Touch 13.10 preview kernels
jdstrand> 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
apw> break-fix: - db181ce011e3c033328608299cd6fac06ea50130
apw> actual fix appears to be: a6138db815df5ee542d848318e5dae681590fccd
jdstrand> linux-lts-saucy no longer receives official support
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):released (3.13.0-34.60~precise1)
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):not-affected
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):not-affected (3.16.0-25.33~14.04.2)
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):not-affected
Ubuntu 12.04 LTS (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored
Ubuntu 14.10 (Utopic Unicorn):needs-triage
Ubuntu 15.04 (Vivid Vervet):needs-triage
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):ignored (abandoned)
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):ignored (abandoned)
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):ignored (abandoned)
Ubuntu 12.04 LTS (Precise Pangolin):ignored (abandoned)
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):not-affected
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Patches:
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored
Ubuntu 14.10 (Utopic Unicorn):not-affected
Ubuntu 15.04 (Vivid Vervet):not-affected
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):ignored (reached end-of-life)
Ubuntu 12.04 LTS (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored
Ubuntu 14.10 (Utopic Unicorn):not-affected
Ubuntu 15.04 (Vivid Vervet):not-affected
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):ignored (was pending [3.11.0-27.47~precise1] OEM release)
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Source: linux (LP Ubuntu Debian)
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):not-affected
Ubuntu 12.04 LTS (Precise Pangolin):not-affected
Ubuntu 14.04 LTS (Trusty Tahr):released (3.13.0-34.60)
Ubuntu 14.10 (Utopic Unicorn):not-affected (3.16.0-8.13)
Ubuntu 15.04 (Vivid Vervet):not-affected (3.16.0-23.31)
Patches:
Introduced by 0c55cfc4166d9a0f38de779bd4d75a90afbe7734Fixed by a6138db815df5ee542d848318e5dae681590fccd
Introduced by 0c55cfc4166d9a0f38de779bd4d75a90afbe7734Fixed by 07b645589dcda8b7a5249e096fece2a67556f0f4
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored
Ubuntu 14.10 (Utopic Unicorn):not-affected
Ubuntu 15.04 (Vivid Vervet):not-affected
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):not-affected
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):ignored (abandoned)
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):ignored (reached end-of-life, does not affect buildd)
Ubuntu 12.04 LTS (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):ignored (was needs-triage now end-of-life)
Ubuntu 14.04 LTS (Trusty Tahr):DNE
Ubuntu 14.10 (Utopic Unicorn):DNE
Ubuntu 15.04 (Vivid Vervet):DNE
Package
Upstream:released (3.17~rc1)
Ubuntu 10.04 LTS (Lucid Lynx):DNE
Ubuntu 12.04 LTS (Precise Pangolin):DNE
Ubuntu 14.04 LTS (Trusty Tahr):ignored
Ubuntu 14.10 (Utopic Unicorn):not-affected
Ubuntu 15.04 (Vivid Vervet):not-affected
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Updated: 2014-12-05 14:15:32 UTC (commit 8802)