Several Linux distributors are releasing updated kernel packages to close security holes in the kernel. For instance, very large packets can reportedly be used to remotely provoke a flaw in the TCP/IPv4 stack's ip_defrag() (net/ipv4/ip_fragment.c) function. This can potentially cause null-pointer dereferencing and crash a system. Whether the flaw can also be exploited to execute code at kernel level by users that are logged into a system at restricted privilege level, which was the case with several previous null-pointer dereferencing bugs, is not mentioned in the distributors' and kernel developers' descriptions. The flaw was discovered in Linux kernel 2.6.32-rc8 and has been fixed in the final version