CVE-2014-5206

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    CVE-2014-5206

    Published: 18 Aug 2014Last Modified: 10 Apr 2026

    Summary:

    Details: The do_remount function in fs/namespace.c in the Linux kernel through 3.16.1 does not maintain the MNT_LOCK_READONLY bit across a remount of a bind mount, which allows local users to bypass an intended read-only restriction and defeat certain sandbox protection mechanisms via a "mount -o remount" command within a user namespace.

    References: http://www.openwall.com/lists/oss-security/2014/08/13/4, http://www.securityfocus.com/bid/69214, http://www.ubuntu.com/usn/USN-2317-1, http://www.ubuntu.com/usn/USN-2318-1, https://bugzilla.redhat.com/show_bug.cgi?id=1129662, https://github.com/torvalds/linux/commit/a6138db815df5ee542d848318e5dae681590fccd, http://www.openwall.com/lists/oss-security/2014/08/13/4, https://bugzilla.redhat.com/show_bug.cgi?id=1129662, https://github.com/torvalds/linux/commit/a6138db815df5ee542d848318e5dae681590fccd, https://bugzilla.redhat.com/show_bug.cgi?id=1129662, http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=a6138db815df5ee542d848318e5dae681590fccd

    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