CVE-2014-7975

MEDIUM

Linux Kernel < 3.17 - Unauthenticated Denial of Service via Unshare and Umount System Calls

Title source: llm
STIX 2.1

Description

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.

References (20)

Core 20
Core References
Third Party Advisory vendor-advisory x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2418-1
Broken Link third-party-advisory x_refsource_secunia
http://secunia.com/advisories/61145
Third Party Advisory, VDB Entry vdb-entry x_refsource_xf
https://exchange.xforce.ibmcloud.com/vulnerabilities/96994
Third Party Advisory vendor-advisory x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2416-1
Third Party Advisory vendor-advisory x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2417-1
Third Party Advisory vendor-advisory x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2415-1
Third Party Advisory vendor-advisory x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2419-1
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1031180
Broken Link third-party-advisory x_refsource_secunia
http://secunia.com/advisories/60174
Third Party Advisory vendor-advisory x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2421-1
Third Party Advisory vendor-advisory x_refsource_ubuntu
http://www.ubuntu.com/usn/USN-2420-1
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2017:2077
Third Party Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2017:1842
Broken Link third-party-advisory x_refsource_secunia
http://secunia.com/advisories/62633
Mailing List, Third Party Advisory mailing-list x_refsource_mlist
http://www.openwall.com/lists/oss-security/2014/10/08/22
Broken Link third-party-advisory x_refsource_secunia
http://secunia.com/advisories/62634
Broken Link mailing-list x_refsource_mlist
http://thread.gmane.org/gmane.linux.kernel.stable/109312
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/70314
Issue Tracking, Patch, Third Party Advisory x_refsource_confirm
https://bugzilla.redhat.com/show_bug.cgi?id=1151108

Scores

CVSS v3 5.5
EPSS 0.0046
EPSS Percentile 37.2%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Details

Status published
Products (5)
canonical/ubuntu_linux 10.04
canonical/ubuntu_linux 12.04
canonical/ubuntu_linux 14.04
canonical/ubuntu_linux 14.10
linux/linux_kernel < 3.17
Published Oct 13, 2014
Tracked Since Feb 18, 2026