<A HREF="http://news.zdnet.com/2100-1009_22-5680040.html?tag=zdnn.alert">RealNetworks has released a security patch</A> aimed at plugging a flaw in its multimedia software that could allow hackers to run their own code on people's computers. The flaw, rated a "highly critical" risk by security company Secunia, affects most recent consumer versions of the RealPlayer media player software, for both Windows and Macintosh operating systems. Also at risk are some, but not the most recent, versions of the software for Linux. The flaw exists in some RealOne Player versions too, RealNetworks said.