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.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[oss-security] 20141008 CVE-2014-7975: 0-day umount denial of service
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