The NTFS filesystem code in Linux kernel 2.6.x up to 2.6.18, and possibly other versions, allows local users to cause a denial of service (CPU consumption) via a malformed NTFS file stream that triggers an infinite loop in the __find_get_block_slow function.
https://exchange.xforce.ibmcloud.com/vulnerabilities/30418
http://www.securityfocus.com/archive/1/471457
http://www.novell.com/linux/security/advisories/2006_79_kernel.html
http://www.debian.org/security/2007/dsa-1304
http://secunia.com/advisories/25714