This bug was fixed in the package linux - 3.2.0-111.153

---------------
linux (3.2.0-111.153) precise; urgency=low

  [ Kamal Mostafa ]

  * Release Tracking Bug
    - LP: #1626151

  * Altering use_tempaddr drops all IPv6 addresses (LP: #994931)
    - Revert "UBUNTU: SAUCE: ipv6: make the net.ipv6.conf.all.use_tempaddr 
sysctl
      propagate to interface settings"
    - neigh: new unresolved queue limits
    - neigh: Add device constructor/destructor capability.
    - atm: clip: Use device neigh support on top of "arp_tbl".
    - atm: clip: remove clip_tbl
    - neigh: convert parms to an array
    - neigh: wrap proc dointvec functions
    - neigh: use tbl->family to distinguish ipv4 from ipv6
    - neigh: restore old behaviour of default parms values
    - neigh: ipv6: respect default values set before an address is assigned to
      device

  * Xen guest total memory size smaller than specified in virtual configuration
    due to Xen balloon driver (LP: #1622567)
    - mm: introduce helper function mem_init_print_info() to simplify mem_init()
    - xen/balloon: Set balloon's initial state to number of existing RAM pages

  * CVE-2016-6136
    - audit: fix a double fetch in audit_log_single_execve_arg()

  * CVE-2016-6480
    - aacraid: Check size values after double-fetch from user

  * CVE-2016-6828
    - tcp: fix use after free in tcp_xmit_retransmit_queue()

 -- Kamal Mostafa <ka...@canonical.com>  Wed, 21 Sep 2016 14:07:18 -0700

** Changed in: linux (Ubuntu Precise)
       Status: Fix Committed => Fix Released

** Changed in: linux (Ubuntu Precise)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/994931

Title:
  Altering use_tempaddr drops all IPv6 addresses

Status in Linux:
  Invalid
Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Precise:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Utopic:
  Invalid

Bug description:
  $ uname -a
  Linux expvr-alnilam 3.2.0-24-generic-pae #37-Ubuntu SMP Wed Apr 25 10:47:59 
UTC 2012 i686 i686 i386 GNU/Linux

  $ sysctl net.ipv6.conf.eth2.use_tempaddr
  net.ipv6.conf.eth2.use_tempaddr = 2
  # (as per the default /etc/sysctl.d/10-ipv6-privacy.conf in 12.04)

  # Add a static IPv6 address:
  $ sudo ip addr add 2001:470:9321:f003::1122/64 dev eth2

  # Verify that it has been set up, and that a temporary address and a SLAAC 
address also exist:
  $ ip -6 addr list dev eth2
  4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
      inet6 2001:470:9321:f003:74e3:aa2b:7ee5:c002/64 scope global temporary 
dynamic 
         valid_lft 86393sec preferred_lft 14393sec
      inet6 2001:470:9321:f003:6c97:24ff:fe3f:263b/64 scope global dynamic 
         valid_lft 86393sec preferred_lft 14393sec
      inet6 2001:470:9321:f003::1122/64 scope global 
         valid_lft forever preferred_lft forever
      inet6 fe80::6c97:24ff:fe3f:263b/64 scope link 
         valid_lft forever preferred_lft forever

  # Disable RFC 4941 temporary addresses:
  $ sudo sysctl net.ipv6.conf.eth2.use_tempaddr=0
  net.ipv6.conf.eth2.use_tempaddr = 0

  $ ip -6 addr list dev eth2
  4: eth2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
      inet6 fe80::6c97:24ff:fe3f:263b/64 scope link tentative 
         valid_lft forever preferred_lft forever

  I.e. on setting use_tempaddr=0, _all_ IPv6 addresses are removed,
  including statically-configured and non-temporary SLAAC-configured
  addresses.  (The link-local address reappears quickly but the
  'tentative' flag indicates that it has been newly re-added.  The SLAAC
  address reappears after a slightly longer interval as the kernel
  continues to undergo SLAAC, but the static address is gone forever
  unless manually reinstated.)

  The same happens if use_tempaddr is changed from 0 back to 2.

  The expected outcome is that only temporary addresses are affected by a 
change to use_tempaddr.
  --- 
  AcpiTables:
   
  AlsaDevices:
   total 0
   crw-rw---T 1 root audio 116,  1 May  5 03:53 seq
   crw-rw---T 1 root audio 116, 33 May  5 03:53 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: i386
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  CurrentDmesg:
   
  DistroRelease: Ubuntu 12.04
  IwConfig: Error: [Errno 2] No such file or directory
  Lspci: Error: [Errno 2] No such file or directory
  Lsusb: Error: [Errno 2] No such file or directory
  Package: linux (not installed)
  PciMultimedia:
   
  ProcEnviron:
   TERM=screen.linux
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: root=UUID=b16ffd9c-a54a-4dd3-a839-16c382ea8787 ro  
console=hvc0
  ProcModules:
   lp 17455 0 - Live 0x00000000
   parport 40930 1 lp, Live 0x00000000
   xenfs 17877 1 - Live 0x00000000
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic-pae 3.2.14
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-24-generic-pae N/A
   linux-backports-modules-3.2.0-24-generic-pae  N/A
   linux-firmware                                1.79
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  precise
  Uname: Linux 3.2.0-24-generic-pae i686
  UpgradeStatus: Upgraded to precise on 2012-05-05 (0 days ago)
  UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

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