CVE-2014-7975

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    CVE-2014-7975

    Published: 13 Oct 2014Last Modified: 16 Apr 2026

    Summary:

    Details: 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: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0ef3a56b1c466629cd0bf482b09c7b0e5a085bb5, http://secunia.com/advisories/60174, http://secunia.com/advisories/61145, http://secunia.com/advisories/62633, http://secunia.com/advisories/62634, http://www.openwall.com/lists/oss-security/2014/10/08/22, http://www.securityfocus.com/bid/70314, http://www.securitytracker.com/id/1031180, http://www.ubuntu.com/usn/USN-2415-1, http://www.ubuntu.com/usn/USN-2416-1, http://www.ubuntu.com/usn/USN-2417-1, http://www.ubuntu.com/usn/USN-2418-1, http://www.ubuntu.com/usn/USN-2419-1, http://www.ubuntu.com/usn/USN-2420-1, http://www.ubuntu.com/usn/USN-2421-1, https://access.redhat.com/errata/RHSA-2017:1842, https://access.redhat.com/errata/RHSA-2017:2077, https://bugzilla.redhat.com/show_bug.cgi?id=1151108, https://exchange.xforce.ibmcloud.com/vulnerabilities/96994, http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0ef3a56b1c466629cd0bf482b09c7b0e5a085bb5, http://www.openwall.com/lists/oss-security/2014/10/08/22, http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=0ef3a56b1c466629cd0bf482b09c7b0e5a085bb5, https://bugzilla.redhat.com/show_bug.cgi?id=1151108, https://bugzilla.redhat.com/show_bug.cgi?id=1151108, http://thread.gmane.org/gmane.linux.kernel.stable/109312

    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
    CVE-2014-7975 | CVE-DB