[Dshield] OpenBSD IPv6 remote kernel crash

Thor Larholm thor at pivx.com
Thu Feb 5 23:08:55 GMT 2004

Here's something for all the OpenBSD administrators on the list.

Georgi Guninski posted an advisory on his site about a remote crash in
the OpenBSD kernel caused by connecting with a small IPv6 MTU.


The error was present in revision 1.81 of /src/sys/netinet6/ip6_output.c
and is fixed in revision 1.82 ( 2004/02/04 08:47:41 ), you can see the
colored diffs at


OpenBSD administrators should pull the revised code from CVS and
recompile their kernels.


Thor Larholm
Senior Security Researcher
PivX Solutions
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