The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-06:06.kmem.asc

Upgrade your system to the appropriate stable release or security branch dated after the correction date https://secure1.securityspace.com/smysecure/catid.html?in=FreeBSD-SA-06:06.kmem.asc

The network sub-system commonly utilizes the ioctl(2) mechanism to pass information regarding the current state and statistics of logical and physical network devices. A buffer allocated from the kernel stack may not be completely initialized before being copied to userland. [CVE-2006-0379] A logic error in computing a buffer length may allow too much data to be copied into userland. [CVE-2006-0380]