XMM exceptions are incorrectly handled in the OpenBSD/i386 kernel, resulting
in a kernel panic that can be triggered by a local user.
This issue has been fixed in -current. Source code patches are available for
OpenBSD 4.4, 4.5 and 4.6.
Patch for OpenBSD 4.6:
Patch for OpenBSD 4.5:
Patch for OpenBSD 4.4:
These patches are also available in the OPENBSD_4_6, OPENBSD_4_5 and
OPENBSD_4_4 patch branches.
Thanks to Slava Pestov for reporting this issue.