Ubuntu Update for apt USN-1475-1

Summary
Ubuntu Update for Linux kernel vulnerabilities USN-1475-1
Solution
Please Install the Updated Packages.
Insight
Georgi Guninski discovered that APT relied on GnuPG argument order and did not check GPG subkeys when validating imported keyrings via apt-key net-update. While it appears that a man-in-the-middle attacker cannot exploit this, as a hardening measure this update adjusts apt-key to validate all subkeys when checking for key collisions.
Affected
apt on Ubuntu 12.04 LTS , Ubuntu 11.10 , Ubuntu 11.04 , Ubuntu 10.04 LTS , Ubuntu 8.04 LTS
References