There is a newly discovered Linux kernel vulnerability, which needs to be fixed. Sadly the only proper way to fix it is to restart all Linux hosts. This applies at least to:

• melkki.cs.helsinki.fi 
• melkinkari.cs.helsinki.fi
• melkinpaasi.cs.helsinki.fi
• users.cs.helsinki.fi
• staff.cs.helsinki.fi
• pangolin.it.helsinki.fi
• All Ukko cluster nodes

The systems motd's (Message of the day) and this break report will be later updated to show the exact time of the restart.