An update to Counter-Strike: Source has been released. The update will be applied automatically when you restart Counter-Strike: Source. The major changes include:

• Added a new command "kickall" which kicks all connected clients except for HLTV and the listenserver host if applicable
  
• Fixed a bug that allowed malicious servers to execute restricted console commands on players
  
• Fixed a bug that allowed malicious servers to prevent players from executing console commands
  
• Updated Steam binaries; fixes Linux crash on shutdown or restart
  
• Performance improvements