CVE-2014-5206 Information

Description

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.

Reference

http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=a6138db815df5ee542d848318e5dae681590fccd 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