This bug was fixed in the package linux-aws - 4.4.0-1048.57

---------------
linux-aws (4.4.0-1048.57) xenial; urgency=low

  * linux-aws: 4.4.0-1048.57 -proposed tracker (LP: #1742256)


  [ Ubuntu: 4.4.0-109.132 ]

  * linux: 4.4.0-109.132 -proposed tracker (LP: #1742252)
  * Kernel trace with xenial 4.4  (4.4.0-108.131, Candidate kernels for PTI fix)
    (LP: #1741934)
    - SAUCE: kaiser: fix perf crashes - fix to original commit

  [ Ubuntu: 4.4.0-108.131 ]

  * linux: 4.4.0-108.131 -proposed tracker (LP: #1741727)
  * CVE-2017-5754
    - x86/mm: Disable PCID on 32-bit kernels

linux-aws (4.4.0-1047.56) xenial; urgency=low

  * linux-aws: 4.4.0-1047.56 -proposed tracker (LP: #1741646)

  [ Ubuntu: 4.4.0-107.130 ]

  * linux: 4.4.0-107.130 -proposed tracker (LP: #1741643)
  * CVE-2017-5754
    - Revert "UBUNTU: SAUCE: arch/x86/entry/vdso: temporarily disable vdso"
    - KPTI: Report when enabled
    - x86, vdso, pvclock: Simplify and speed up the vdso pvclock reader
    - x86/vdso: Get pvclock data from the vvar VMA instead of the fixmap
    - x86/kasan: Clear kasan_zero_page after TLB flush
    - kaiser: Set _PAGE_NX only if supported

  [ Ubuntu: 4.4.0-106.129 ]

  * linux: 4.4.0-106.129 -proposed tracker (LP: #1741528)
  * CVE-2017-5754
    - KAISER: Kernel Address Isolation
    - kaiser: merged update
    - kaiser: do not set _PAGE_NX on pgd_none
    - kaiser: stack map PAGE_SIZE at THREAD_SIZE-PAGE_SIZE
    - kaiser: fix build and FIXME in alloc_ldt_struct()
    - kaiser: KAISER depends on SMP
    - kaiser: fix regs to do_nmi() ifndef CONFIG_KAISER
    - kaiser: fix perf crashes
    - kaiser: ENOMEM if kaiser_pagetable_walk() NULL
    - kaiser: tidied up asm/kaiser.h somewhat
    - kaiser: tidied up kaiser_add/remove_mapping slightly
    - kaiser: kaiser_remove_mapping() move along the pgd
    - kaiser: cleanups while trying for gold link
    - kaiser: name that 0x1000 KAISER_SHADOW_PGD_OFFSET
    - kaiser: delete KAISER_REAL_SWITCH option
    - kaiser: vmstat show NR_KAISERTABLE as nr_overhead
    - x86/mm: Enable CR4.PCIDE on supported systems
    - x86/mm: Build arch/x86/mm/tlb.c even on !SMP
    - x86/mm, sched/core: Uninline switch_mm()
    - x86/mm: Add INVPCID helpers
    - x86/mm: If INVPCID is available, use it to flush global mappings
    - kaiser: enhanced by kernel and user PCIDs
    - kaiser: load_new_mm_cr3() let SWITCH_USER_CR3 flush user
    - kaiser: PCID 0 for kernel and 128 for user
    - kaiser: x86_cr3_pcid_noflush and x86_cr3_pcid_user
    - kaiser: paranoid_entry pass cr3 need to paranoid_exit
    - kaiser: _pgd_alloc() without __GFP_REPEAT to avoid stalls
    - kaiser: fix unlikely error in alloc_ldt_struct()
    - kaiser: add "nokaiser" boot option, using ALTERNATIVE
    - x86/kaiser: Rename and simplify X86_FEATURE_KAISER handling
    - x86/boot: Add early cmdline parsing for options with arguments
    - x86/kaiser: Check boottime cmdline params
    - kaiser: use ALTERNATIVE instead of x86_cr3_pcid_noflush
    - kaiser: drop is_atomic arg to kaiser_pagetable_walk()
    - kaiser: asm/tlbflush.h handle noPGE at lower level
    - kaiser: kaiser_flush_tlb_on_return_to_user() check PCID
    - x86/paravirt: Dont patch flush_tlb_single
    - x86/kaiser: Reenable PARAVIRT
    - kaiser: disabled on Xen PV
    - x86/kaiser: Move feature detection up
    - kvm: x86: fix RSM when PCID is non-zero
    - SAUCE: arch/x86/entry/vdso: temporarily disable vdso
    - [Config]: CONFIG_KAISER=y

 -- Marcelo Henrique Cerri <email address hidden>  Tue, 09 Jan 2018 19:06:19 -0200