CVE-2014-9717

MEDIUM

Linux kernel <4.0.2 - Privilege Escalation

Title source: llm

Description

fs/namespace.c in the Linux kernel before 4.0.2 processes MNT_DETACH umount2 system calls without verifying that the MNT_LOCKED flag is unset, which allows local users to bypass intended access restrictions and navigate to filesystem locations beneath a mount by calling umount2 within a user namespace.

References (11)

[Vendor Advisory] http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ce07d891a0891d3c0d0c2d73d577490486b809e1

[Mailing List] http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00054.html

[Mailing List] http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00056.html

[Mailing List] http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html

[Vendor Advisory] http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.2

[Various Sources] http://www.spinics.net/lists/linux-containers/msg30786.html

[Issue Tracking] https://bugzilla.redhat.com/show_bug.cgi?id=1226751

[Vendor Advisory] https://github.com/torvalds/linux/commit/ce07d891a0891d3c0d0c2d73d577490486b809e1

[Mailing List] https://groups.google.com/forum/message/raw?msg=linux.kernel/HnegnbXk0Vs/RClojwJzAFEJ

[Third Party Advisory, VDB Entry] http://www.securityfocus.com/bid/74226

[Mailing List] http://www.openwall.com/lists/oss-security/2015/04/17/4

Scores

CVSS v3 6.1

EPSS 0.0004

EPSS Percentile 12.3%

Attack Vector LOCAL

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N

Classification

CWE

CWE-284

Status draft

Affected Products (1)

linux/linux_kernel < 4.0.1

Timeline

Published May 02, 2016

Tracked Since Feb 18, 2026