To clarify the above comment:

Precise running 3.2 kernel: not affected
Precise running 3.13 lts kernel: affected
Trusty running 3.13 kernel: not affected

In the Precise + lts kernel case, it's possible to hack around the
userland tools to make the keys become permanent (keyutils +
libkeyutils1 + libnfsidmap2 from trusty + /usr/sbin/nfsidmap + /etc
/request-key.d/id_resolver.conf from nfs-common in trusty). I was not
able to find a way to make the keys renew automatically which would be
the right behavior.

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https://bugs.launchpad.net/bugs/1124250

Title:
  Partially incorrect uid mapping with nfs4/idmapd/ldap-auth

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