5 Security Things to Know for the Week of Oct. 2

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1)  A Linux privilege-escalation vulnerability - nicknamed Dirty COW because of where it is located in the kernel - that came to light about a year ago is now under active exploit in Android devices.

2) Phishers are using several popular banks as the lure in email-based attacks seeking to spread malware.

3) Microsoft is playing down the risk associated with a vulnerability researchers say can help bypass Windows Defender anti-malware protections.

4) Researchers are set to show how millions of Mac computers may not be receiving their necessary firmware updates. 

5) The U.S. Senate passed a new law aimed at providing small and midsize businesses with additional cybersecurity resources.