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USN-3756-1: Intel Microcode vulnerabilities

27 August 2018

The system could be made to expose sensitive information.

Releases

Packages

Details

It was discovered that memory present in the L1 data cache of an Intel CPU
core may be exposed to a malicious process that is executing on the CPU
core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
attacker in a guest virtual machine could use this to expose sensitive
information (memory from other guests or the host OS). (CVE-2018-3646)

Jann Horn and Ken Johnson discovered that microprocessors utilizing
speculative execution of a memory read may allow unauthorized memory reads
via a sidechannel attack. This flaw is known as Spectre Variant 4. A local
attacker could use this to expose sensitive information, including kernel
memory. (CVE-2018-3639)

Zdenek Sojka, Rudolf Marek, Alex Zuepke, and Innokentiy Sennovskiy
discovered that microprocessors that perform speculative reads of
system registers may allow unauthorized disclosure of system parameters
via a sidechannel attack. This vulnerability is also known as Rogue
System Register Read (RSRE). An attacker could use this to expose
sensitive information. (CVE-2018-3640)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 18.04
Ubuntu 16.04
Ubuntu 14.04

After a standard system update you need to reboot your computer to make
all the necessary changes.

Related notices

  • USN-3742-2: linux-image-generic-lts-trusty, linux-image-generic-lpae-lts-trusty, linux-image-3.13.0-155-generic-lpae, linux-lts-trusty, linux-image-3.13.0-155-generic
  • USN-3654-1: linux-image-4.4.0-1060-aws, linux-image-4.4.0-127-powerpc64-emb, linux-aws, linux-kvm, linux-image-4.4.0-1026-kvm, linux-image-4.4.0-127-powerpc-smp, linux-image-4.4.0-127-lowlatency, linux-image-4.4.0-127-generic-lpae, linux-image-4.4.0-127-powerpc-e500mc, linux-image-4.4.0-127-powerpc64-smp, linux-image-extra-4.4.0-127-generic, linux-image-4.4.0-127-generic, linux
  • USN-3653-1: linux-image-generic-lpae, linux-image-lowlatency, linux-image-4.13.0-43-generic, linux-image-4.13.0-43-generic-lpae, linux-image-4.13.0-43-lowlatency, linux, linux-image-generic
  • USN-3654-2: linux-image-4.4.0-127-powerpc64-emb, linux-aws, linux-image-4.4.0-1022-aws, linux-image-4.4.0-127-powerpc-smp, linux-image-4.4.0-127-lowlatency, linux-image-4.4.0-127-generic-lpae, linux-image-4.4.0-127-powerpc-e500mc, linux-image-4.4.0-127-powerpc64-smp, linux-image-extra-4.4.0-127-generic, linux-image-4.4.0-127-generic, linux-lts-xenial
  • USN-3680-1: libvirt-daemon-driver-storage-rbd, libvirt-wireshark, libvirt-daemon-system, libvirt-daemon, libvirt-daemon-driver-storage-zfs, libvirt, libvirt0, libvirt-dev, libvirt-sanlock, libvirt-daemon-driver-storage-gluster, libvirt-clients, libvirt-daemon-driver-storage-sheepdog, libvirt-bin, libvirt-doc, libnss-libvirt
  • USN-3655-1: linux-image-3.13.0-149-generic, linux-image-3.13.0-149-powerpc64-smp, linux-image-3.13.0-149-lowlatency, linux-image-3.13.0-149-powerpc-smp, linux-image-3.13.0-149-powerpc64-emb, linux-image-3.13.0-149-powerpc-e500mc, linux-image-3.13.0-149-generic-lpae, linux, linux-image-3.13.0-149-powerpc-e500, linux-image-extra-3.13.0-149-generic
  • USN-3740-2: linux-image-4.15.0-32-generic-lpae, linux-azure, linux-image-unsigned-4.15.0-32-lowlatency, linux-gcp, linux-hwe, linux-image-unsigned-4.15.0-1021-azure, linux-image-4.15.0-32-generic, linux-image-unsigned-4.15.0-32-generic, linux-image-4.15.0-1017-gcp, linux-image-4.15.0-32-lowlatency
  • USN-3679-1: qemu-system-arm, qemu-kvm, qemu-user-static, qemu, qemu-keymaps, qemu-system-x86, qemu-utils, qemu-user-binfmt, qemu-system-s390x, qemu-system-ppc, qemu-guest-agent, qemu-common, qemu-system, qemu-system-misc, qemu-block-extra, qemu-system-sparc, qemu-system-common, qemu-user, qemu-system-mips, qemu-system-aarch64
  • USN-3653-2: linux-image-4.13.0-1028-oem, linux-image-4.13.0-43-generic, linux-azure, linux-image-extra-4.13.0-1018-azure, linux-gcp, linux-image-4.13.0-1017-gcp, linux-hwe, linux-image-4.13.0-43-generic-lpae, linux-image-extra-4.13.0-1017-gcp, linux-image-4.13.0-1018-azure, linux-image-extra-4.13.0-43-generic, linux-image-4.13.0-43-lowlatency, linux-oem
  • USN-3742-1: linux, linux-image-3.13.0-155-powerpc64-smp, linux-image-3.13.0-155-generic-lpae, linux-image-3.13.0-155-powerpc-e500mc, linux-image-extra-3.13.0-155-generic, linux-image-3.13.0-155-powerpc64-emb, linux-image-3.13.0-155-powerpc-smp, linux-image-3.13.0-155-generic, linux-image-3.13.0-155-powerpc-e500, linux-image-3.13.0-155-lowlatency
  • USN-3777-3: linux-image-unsigned-4.15.0-1025-azure, linux-azure
  • USN-3652-1: linux-image-unsigned-4.15.0-22-generic, linux-aws, linux-image-unsigned-4.15.0-1012-azure, linux-azure, linux-kvm, linux-image-4.15.0-22-generic, linux-gcp, linux-oem, linux-image-unsigned-4.15.0-1006-oem, linux-image-4.15.0-1008-gcp, linux-image-4.15.0-1009-aws, linux-image-unsigned-4.15.0-22-lowlatency, linux-image-4.15.0-22-lowlatency, linux-image-4.15.0-22-snapdragon, linux, linux-image-4.15.0-22-generic-lpae, linux-image-4.15.0-1010-kvm
  • USN-3740-1: linux-aws, linux-gcp, linux-image-4.15.0-32-snapdragon, linux-image-4.15.0-32-generic, linux-oem, linux-image-4.15.0-1019-aws, linux-image-4.15.0-1017-gcp, linux-image-4.15.0-1020-raspi2, linux-image-unsigned-4.15.0-32-lowlatency, linux-image-unsigned-4.15.0-1015-oem, linux-kvm, linux-azure, linux-image-unsigned-4.15.0-1021-azure, linux-raspi2, linux, linux-image-4.15.0-32-generic-lpae, linux-image-4.15.0-1019-kvm, linux-image-unsigned-4.15.0-32-generic, linux-image-4.15.0-32-lowlatency
  • USN-3741-2: linux-image-4.4.0-133-lowlatency, linux-image-4.4.0-1027-aws, linux-aws, linux-image-4.4.0-133-powerpc-smp, linux-image-4.4.0-133-generic, linux-image-4.4.0-133-powerpc64-emb, linux-image-extra-4.4.0-133-generic, linux-image-4.4.0-133-powerpc-e500mc, linux-lts-xenial, linux-image-4.4.0-133-powerpc64-smp, linux-image-4.4.0-133-generic-lpae
  • USN-3823-1: linux-image-powerpc-smp, linux-image-3.2.0-137-virtual, linux-image-3.2.0-137-powerpc64-smp, linux-image-3.2.0-137-omap, linux-image-3.2.0-137-highbank, linux-image-powerpc, linux-image-3.2.0-137-powerpc-smp, linux-image-virtual, linux-image-3.2.0-137-generic-pae, linux-image-3.2.0-137-generic, linux-image-highbank, linux-image-omap, linux-image-generic-pae, linux, linux-image-powerpc64-smp, linux-image-generic
  • USN-3655-2: linux-image-generic-lts-trusty, linux-image-3.13.0-149-generic, linux-image-generic-lpae-lts-trusty, linux-lts-trusty, linux-image-3.13.0-149-generic-lpae
  • USN-3741-1: linux-image-4.4.0-133-lowlatency, linux-aws, linux-image-4.4.0-1098-snapdragon, linux-kvm, linux-snapdragon, linux-image-4.4.0-1031-kvm, linux-image-4.4.0-1065-aws, linux-image-4.4.0-133-powerpc-smp, linux-image-4.4.0-133-generic, linux-image-4.4.0-133-powerpc64-emb, linux-image-extra-4.4.0-133-generic, linux-image-4.4.0-133-powerpc-e500mc, linux-raspi2, linux, linux-image-4.4.0-1094-raspi2, linux-image-4.4.0-133-powerpc64-smp, linux-image-4.4.0-133-generic-lpae
  • USN-3651-1: qemu-system-arm, qemu-kvm, qemu-user-static, qemu, qemu-keymaps, qemu-system-x86, qemu-utils, qemu-user-binfmt, qemu-system-s390x, qemu-system-ppc, qemu-guest-agent, qemu-common, qemu-system, qemu-system-misc, qemu-block-extra, qemu-system-sparc, qemu-system-common, qemu-user, qemu-system-mips, qemu-system-aarch64