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CVE-2015-2925

Published: 06 April 2015

The prepend_path function in fs/dcache.c in the Linux kernel before 4.2.4 does not properly handle rename actions inside a bind mount, which allows local users to bypass an intended container protection mechanism by renaming a directory, related to a "double-chroot attack."

From the Ubuntu security team

It was discovered that in certain situations, a directory could be renamed outside of a bind mounted location. An attacker could use this to escape bind mount containment and gain access to sensitive information.

Priority

Medium

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
Patches:
Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed by cde93be45a8a90d8c264c776fab63487b5038a65
Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed by 397d425dc26da728396e66d392d5dcb8dac30c37
linux-2.6
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-armadaxp
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-ec2
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-fsl-imx51
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-linaro-omap
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-linaro-shared
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-lts-quantal
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-lts-saucy
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-mvl-dove
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-qcm-msm
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)
linux-ti-omap4
Launchpad, Ubuntu, Debian
Upstream
Released (4.3~rc1)

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
kamal
See gmane-151103 article for more backport discussion, specifically
that Eric B.'s backport eliminates the requirement for this patch:
70291ae namei: lift (open-coded) terminate_walk() in follow_dotdot_rcu() into callers

References

Bugs