The (1) real_lookup and (2) __lookup_hash functions in fs/namei.c in
the vfs implementation in the Linux kernel before 22.214.171.124 do not
prevent creation of a child dentry for a deleted (aka S_DEAD)
directory, which allows local users to cause a denial of service
("overflow" of the UBIFS orphan area) via a series of attempted file
creations within deleted directories.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[linux-kernel] 20080702 Is VFS behavior fine?
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