The do_ipv6_setsockopt function in net/ipv6/ipv6_sockglue.c in Linux
kernel before 2.6.20, and possibly other versions, allows local users
to cause a denial of service (oops) by calling setsockopt with the
IPV6_RTHDR option name and possibly a zero option length or invalid
option value, which triggers a NULL pointer dereference.
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