CVE-2014-7975

Published: 13 October 2014

The do_umount function in fs/namespace.c in the Linux kernel through 3.17 does not require the CAP_SYS_ADMIN capability for do_remount_sb calls that change the root filesystem to read-only, which allows local users to cause a denial of service (loss of writability) by making certain unshare system calls, clearing the / MNT_LOCKED flag, and making an MNT_FORCE umount system call.

From the Ubuntu security team

Andy Lutomirski discovered that the Linux kernel was not checking the CAP_SYS_ADMIN when remounting filesystems to read-only. A local user could exploit this flaw to cause a denial of service (loss of writability).

Priority

Medium

CVSS 3 base score: 5.5

Status

Package Release Status
linux
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
Patches:
Introduced by 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Fixed by a1480dcc3c706e309a88884723446f2e84fedd5b
linux-2.6
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-armadaxp
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-aws
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-ec2
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-flo
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-fsl-imx51
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-gke
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-goldfish
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-grouper
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-hwe
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-hwe-edge
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-linaro-omap
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-linaro-shared
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-linaro-vexpress
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-lts-quantal
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-lts-raring
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-lts-saucy
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
This package is not directly supported by the Ubuntu Security Team
linux-lts-trusty
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-lts-utopic
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-lts-vivid
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-lts-wily
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-lts-xenial
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-maguro
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-mako
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-manta
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-mvl-dove
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-qcm-msm
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-raspi2
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-snapdragon
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)
linux-ti-omap4
Launchpad, Ubuntu, Debian
Upstream
Released (3.18~rc1)