BlackBerry maker Research in Motion has issued a security patch for the popular device, whose users include U.S. President Barack Obama, warning that it is vulnerable to attacks by hackers.

Research in Motion issued the security warning last week in a bulletin on its Web site, but officials could not be reached to comment on details of the patch.

If the patch is not applied, security experts said, there is a risk that hackers could exploit the vulnerability, though they have not done so yet.

Such problems are not unique to Research in Motion. Technology companies constantly battle to stay ahead of increasingly sophisticated hackers. Every time a vulnerability is identified, there is potential for hackers to exploit it.

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