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[Andy Whitcroft <apw@xxxxxxxxxxxxx>]

I have installed VMs with the various combinations and tried the POC as
supplied with each.  I confirm that only vivid and later are exposed by
the exploit.

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https://bugs.launchpad.net/bugs/1528904

Title:
  overlay setattr vulnerability

Status in linux package in Ubuntu:
  Triaged

Bug description:
  http://www.openwall.com/lists/oss-security/2015/12/23/5

  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=acff81ec2c79492b180fade3c2894425cd35a545

  This allows unprivileged users to change attributes on root-owned
  files.

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