Secunia Security Advisories warns a vulnerability has been reported in OpenBSD, which can be exploited by malicious, local users to escalate their privileges or cause a DoS (Denial of Service).
The vulnerability is caused due to a boundary error in "compat_ibcs2". This can be exploited by running a specially crafted binary, which causes a buffer overflow.
More information about the vulnerability can be found at: http://www.secunia.com/advisories/10246/
Patches which address the flaw are available from: