OpenBSD kernel 3.3 and 3.4 allows local users to cause a denial of service (kernel panic) and possibly execute arbitrary code in 3.4 via a program with an invalid header that is not properly handled by (1) ibcs2_exec.c in the iBCS2 emulation (compat_ibcs2) or (2) exec_elf.c, which leads to a stack-based buffer overflow.
ftp://ftp.openbsd.org/pub/OpenBSD/patches/3.4/common/005_exec.patch
lists.grok.org.uk/pipermail/full-disclosure/2003-November/013315.html
marc.info/?l=openbsd-security-announce&m=106808820119679&w=2
marc.info/?l=openbsd-security-announce&m=106917441524978&w=2
www.guninski.com/msuxobsd2.html
www.openbsd.org/errata33.html
www.securityfocus.com/bid/8978