This bug was fixed in the package linux - 4.8.0-11.12

---------------
linux (4.8.0-11.12) yakkety; urgency=low

  * change_hat is logging failures during expected hat probing (LP: #1615893)
    - SAUCE: apparmor: Fix auditing behavior for change_hat probing

  * deleted files outside of the namespace are not being treated as
    disconnected
    (LP: #1615892)
    - SAUCE: apparmor: deleted dentries can be disconnected

  * stacking to unconfined in a child namespace confuses mediation
    (LP: #1615890)
    - SAUCE: apparmor: special case unconfined when determining the mode

  * apparmor module parameters can be changed after the policy is locked
    (LP: #1615895)
    - SAUCE: apparmor: fix: parameters can be changed after policy is locked

  * AppArmor profile reloading causes an intermittent kernel BUG (LP:
    #1579135)
    - SAUCE: apparmor: fix vec_unique for vectors larger than 8

  * label vec reductions can result in reference labels instead of direct
    access
    to labels (LP: #1615889)
    - SAUCE: apparmor: reduction of vec to single entry is just that entry

  * profiles from different namespaces can block other namespaces from being
    able to load a profile (LP: #1615887)
    - SAUCE: apparmor: profiles in one ns can affect mediation in another ns

  * The label build for onexec when stacking is wrong (LP: #1615881)
    - SAUCE: apparmor: Fix label build for onexec stacking.

  * The inherit check for new to old label comparison for domain transitions
    is
    wrong (LP: #1615880)
    - SAUCE: apparmor: Fix new to old label comparison for domain transitions

  * warning stack trace while playing with apparmor namespaces (LP: #1593874)
    - SAUCE: apparmor: fix stack trace when removing namespace with profiles

  * __label_update proxy comparison test is wrong (LP: #1615878)
    - SAUCE: apparmor: Fix __label_update proxy comparison test

  * reading /sys/kernel/security/apparmor/profiles requires CAP_MAC_ADMIN
    (LP: #1560583)
    - SAUCE: apparmor: Allow ns_root processes to open profiles file
    - SAUCE: apparmor: Consult sysctl when reading profiles in a user ns

  * policy namespace stacking (LP: #1379535)
    - SAUCE: (no-up) apparmor: rebase of apparmor3.5-beta1 snapshot for 4.8
    - SAUCE: add a sysctl to enable unprivileged user ns AppArmor policy loading

  * Miscellaneous Ubuntu changes
    - [Debian] Dynamically determine linux udebs package name
    - [Debian] d-i -- fix dtb handling in new kernel-wedge form
    - SAUCE: apparmor: Fix FTBFS due to bad include path
    - SAUCE: apparmor: add data query support
    - [Config] Set CONFIG_SECURITY_APPARMOR_UNCONFINED_INIT=y

  * Miscellaneous upstream changes
    - fixup backout policy view capable for forward port
    - apparmor: fix: Rework the iter loop for label_update
    - apparmor: add more assertions for updates/merges to help catch errors
    - apparmor: Make pivot root transitions work with stacking
    - apparmor: convert delegating deleted files to mediate deleted files
    - apparmor: add missing parens. not a bug fix but highly recommended
    - apparmor: add a stack_version file to allow detection of bug fixes
    - apparmor: push path lookup into mediation loop
    - apparmor: default to allowing unprivileged userns policy
    - apparmor: fix: permissions test to view and manage policy
    - apparmor: Add Basic ns cross check condition for ipc

 -- Leann Ogasawara <leann.ogasaw...@canonical.com>  Sat, 17 Sep 2016
10:03:16 -0700

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

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https://bugs.launchpad.net/bugs/1592547

Title:
  vmalloc failure leads to null ptr dereference in aa_dfa_next

Status in AppArmor:
  New
Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

Bug description:
  running stress-ng apparmor stressor with a vmalloc NULL return trips a
  null ptr dereference in aa_dfa_next:

  $ uname -a
  Linux ubuntu 4.4.0-24-generic #43

  [   46.271517] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000020
  [   46.271641] IP: [<ffffffff8137a8a6>] aa_dfa_next+0x6/0x70
  [   46.271743] PGD 39ebd067 PUD 39ebe067 PMD 0
  [   46.271833] Oops: 0000 [#1] SMP
  [   46.271926] Modules linked in: jitterentropy_rng algif_rng salsa20_generic 
salsa20_x86_64 camellia_generic camellia_aesni_avx_x86_64 camellia_x86_64 
cast6_avx_x86_64 cast6_generic cast_common serpent_avx_x86_64 
serpent_sse2_x86_64 serpent_generic twofish_generic twofish_avx_x86_64 
twofish_x86_64_3way twofish_x86_64 twofish_common xts algif_skcipher tgr192 
wp512 rmd320 rmd256 rmd160 rmd128 md4 algif_hash af_alg ppdev 
snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep 
snd_pcm input_leds joydev snd_timer serio_raw snd soundcore i2c_piix4 mac_hid 
8250_fintek parport_pc parport ib_iser rdma_cm iw_cm ib_cm ib_sa ib_mad ib_core 
ib_addr iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi autofs4 btrfs 
raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor 
raid6_pq
  [   46.273290]  libcrc32c raid1 raid0 multipath linear 8139too 
crct10dif_pclmul crc32_pclmul qxl aesni_intel aes_x86_64 lrw gf128mul ttm 
drm_kms_helper glue_helper ablk_helper cryptd syscopyarea sysfillrect sysimgblt 
fb_sys_fops psmouse drm floppy 8139cp mii pata_acpi
  [   46.274250] CPU: 0 PID: 1349 Comm: stress-ng-appar Not tainted 
4.4.0-24-generic #43
  [   46.274436] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
Ubuntu-1.8.2-1ubuntu1 04/01/2014
  [   46.274632] task: ffff8800374be040 ti: ffff88003746c000 task.ti: 
ffff88003746c000
  [   46.274854] RIP: 0010:[<ffffffff8137a8a6>]  [<ffffffff8137a8a6>] 
aa_dfa_next+0x6/0x70
  [   46.275072] RSP: 0018:ffff88003746fca8  EFLAGS: 00010282
  [   46.275450] RAX: 0000000000000000 RBX: 0000000000000003 RCX: 
0000000000004a46
  [   46.275934] RDX: 0000000000000002 RSI: 0000000000000001 RDI: 
0000000000000000
  [   46.276348] RBP: ffff88003746fd28 R08: ffff88003fc19f40 R09: 
ffff88003e001d00
  [   46.276757] R10: ffff88003da8e600 R11: ffff88003e001500 R12: 
ffff88003746fd48
  [   46.276979] R13: ffff88003acc4800 R14: ffff88003acc4894 R15: 
0000000000000029
  [   46.277202] FS:  00007f7198a0f700(0000) GS:ffff88003fc00000(0000) 
knlGS:0000000000000000
  [   46.277500] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [   46.278006] CR2: 0000000000000020 CR3: 0000000039ebc000 CR4: 
00000000001406f0
  [   46.278592] Stack:
  [   46.278846]  ffff88003746fd28 ffffffff81383585 0000000000000000 
0000000000000000
  [   46.279271]  000000003746fd00 0000000000000000 ffffc9000268e400 
0000000000000000
  [   46.279860]  ffff88003746fd40 0000000000000000 000000005833b243 
ffff88003746fe28
  [   46.280311] Call Trace:
  [   46.280606]  [<ffffffff81383585>] ? unpack_profile+0x5c5/0x970
  [   46.280854]  [<ffffffff81383ad9>] aa_unpack+0xe9/0x450
  [   46.281091]  [<ffffffff81381e97>] aa_replace_profiles+0x77/0xb70
  [   46.281341]  [<ffffffff811cf81b>] ? vmalloc+0x6b/0x70
  [   46.281610]  [<ffffffff813770df>] policy_update+0x9f/0x1f0
  [   46.281887]  [<ffffffff81377243>] profile_replace+0x13/0x20
  [   46.282169]  [<ffffffff8120c528>] __vfs_write+0x18/0x40
  [   46.282444]  [<ffffffff8120ceb9>] vfs_write+0xa9/0x1a0
  [   46.282728]  [<ffffffff8120be4f>] ? do_sys_open+0x1bf/0x2a0
  [   46.283418]  [<ffffffff8120db75>] SyS_write+0x55/0xc0
  [   46.284188]  [<ffffffff81825cb2>] entry_SYSCALL_64_fastpath+0x16/0x71
  [   46.284753] Code: 0c 42 39 ce 74 d9 0f b6 02 41 0f b7 34 7b 84 c0 75 d9 eb 
c3 41 0f b7 34 44 eb 89 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 <48> 8b 
47 20 4c 8b 5f 28 4c 8b 57 40 48 89 e5 4c 8b 4f 18 48 8d 
  [   46.285401] RIP  [<ffffffff8137a8a6>] aa_dfa_next+0x6/0x70

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