The following effect may be a consequence of the same bug.

Distribution: Ubuntu 10.04

1) Create user1 ( with administrative privileges )
2) Create user2 ( without administrative privileges )
3) Logged as user2 set up a private directory, logout & login, create some 
files in ~/Private, logout.
4) Logged as user1 change user2 password.
5) Logged as user2 (using the new password defined by user1) you can access the 
/home/user2/Private directory and its contents.

The effect persists until you reboot.

Conclusion:
A privileged user can access private data from others (who recently have logged 
in and out ) by means of changing their password.

-- 
umount of ecryptfs does not automatically clear the keyring (can be mounted by 
root later)
https://bugs.launchpad.net/bugs/313812
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