Google has released an updated version, 10.0.648.133, of its Chrome browser for Mac OS X, Linux, Windows, and Chrome Frame. According to the Release Announcement on the Chrome Releases blog, this update fixes a single, serious security vulnerability.
WIndows users can obtain the new version via the built-in update mechanism (Help / About Google Chrome). Linux users should be able to get the new version using standard package update tools (e.g., apt-get, synaptic).
Because of the security content of this update, I recommend that you install it as soon as you conveniently can.