USN-3756-1: Intel Microcode vulnerabilities

Releases

• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM
• Ubuntu 14.04 ESM

Packages

• intel-microcode - Processor microcode for Intel CPUs

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

• intel-microcode - 3.20180807a.0ubuntu0.18.04.1

Ubuntu 16.04

• intel-microcode - 3.20180807a.0ubuntu0.16.04.1

Ubuntu 14.04

• intel-microcode - 3.20180807a.0ubuntu0.14.04.1

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

References

• CVE-2018-3639
• CVE-2018-3640
• CVE-2018-3646

Related notices

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