CVE-2014-9717

    Dashboard / Vulnerabilities / CVE-2014-9717

    CVE-2014-9717

    Published: 2 May 2016Last Modified: 10 Apr 2026

    Summary:

    Details: 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: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=ce07d891a0891d3c0d0c2d73d577490486b809e1, https://github.com/torvalds/linux/commit/ce07d891a0891d3c0d0c2d73d577490486b809e1, https://bugzilla.redhat.com/show_bug.cgi?id=1226751, http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00054.html, http://lists.opensuse.org/opensuse-security-announce/2016-06/msg00056.html, http://lists.opensuse.org/opensuse-security-announce/2016-08/msg00000.html, http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.2, http://www.openwall.com/lists/oss-security/2015/04/17/4, http://www.securityfocus.com/bid/74226, http://www.spinics.net/lists/linux-containers/msg30786.html, https://groups.google.com/forum/message/raw?msg=linux.kernel/HnegnbXk0Vs/RClojwJzAFEJ

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High