The mountpoint_last function in fs/namei.c in the Linux kernel before
3.15.8 does not properly maintain a certain reference count during
attempts to use the umount system call in conjunction with a symlink,
which allows local users to cause a denial of service (memory
consumption or use-after-free) or possibly have unspecified other
impact via the umount program.
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] 20140723 Re: CVE request: kernel: vfs: refcount issues during unmount on symlink
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