Ubuntu: USN-3641-1 Critical: Kernel Denial Of Service and Escalation

ubuntu

May 8, 2018

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

- linux-raspi2: Linux kernel for Raspberry Pi 2

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-euclid: Linux kernel for Intel Euclid systems

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-hwe: Linux hardware enablement (HWE) kernel

- linux-kvm: Linux kernel for cloud environments

- linux-oem: Linux kernel for OEM processors- linux-snapdragon: Linux kernel for Snapdragon processors- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Nick Peterson discovered that the Linux kernel did not

properly handle debug exceptions following a MOV/POP to SS

instruction. A local attacker could use this to cause a denial

of service (system crash). This issue only affected the amd64

architecture. (CVE-2018-8897)

Andy Lutomirski discovered that the KVM s...

Read the Full Advisory

Topics Covered

security advisory denial of service critical kernel ubuntu escalation linux kernel

Update Instructions

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

Ubuntu 17.10:
  linux-image-4.13.0-1019-raspi2  4.13.0-1019.20
  linux-image-4.13.0-41-generic   4.13.0-41.46
  linux-image-4.13.0-41-generic-lpae  4.13.0-41.46
  linux-image-4.13.0-41-lowlatency  4.13.0-41.46
  linux-image-generic             4.13.0.41.44
  linux-image-generic-lpae        4.13.0.41.44
  linux-image-lowlatency          4.13.0.41.44
  linux-image-raspi2              4.13.0.1019.17

Ubuntu 16.04 LTS:
  linux-image-4.13.0-1015-gcp     4.13.0-1015.19
  linux-image-4.13.0-1016-azure   4.13.0-1016.19
  linux-image-4.13.0-1026-oem     4.13.0-1026.29
  linux-image-4.13.0-41-generic   4.13.0-41.46~16.04.1
  linux-image-4.13.0-41-generic-lpae  4.13.0-41.46~16.04.1
  linux-image-4.13.0-41-lowlatency  4.13.0-41.46~16.04.1
  linux-image-4.4.0-1023-kvm      4.4.0-1023.28
  linux-image-4.4.0-1057-aws      4.4.0-1057.66
  linux-image-4.4.0-1089-raspi2   4.4.0-1089.97
  linux-image-4.4.0-1092-snapdragon  4.4.0-1092.97
  linux-image-4.4.0-124-generic   4.4.0-124.148
  linux-image-4.4.0-124-generic-lpae  4.4.0-124.148
  linux-image-4.4.0-124-lowlatency  4.4.0-124.148
  linux-image-4.4.0-124-powerpc-e500mc  4.4.0-124.148
  linux-image-4.4.0-124-powerpc-smp  4.4.0-124.148
  linux-image-4.4.0-124-powerpc64-emb  4.4.0-124.148
  linux-image-4.4.0-124-powerpc64-smp  4.4.0-124.148
  linux-image-4.4.0-9027-euclid   4.4.0-9027.29
  linux-image-aws                 4.4.0.1057.59
  linux-image-azure               4.13.0.1016.17
  linux-image-euclid              4.4.0.9027.28
  linux-image-gcp                 4.13.0.1015.17
  linux-image-generic             4.4.0.124.130
  linux-image-generic-hwe-16.04   4.13.0.41.60
  linux-image-generic-lpae        4.4.0.124.130
  linux-image-generic-lpae-hwe-16.04  4.13.0.41.60
  linux-image-gke                 4.13.0.1015.17
  linux-image-kvm                 4.4.0.1023.22
  linux-image-lowlatency          4.4.0.124.130
  linux-image-lowlatency-hwe-16.04  4.13.0.41.60
  linux-image-oem                 4.13.0.1026.30
  linux-image-powerpc-e500mc      4.4.0.124.130
  linux-image-powerpc-smp         4.4.0.124.130
  linux-image-powerpc64-emb       4.4.0.124.130
  linux-image-powerpc64-smp       4.4.0.124.130
  linux-image-raspi2              4.4.0.1089.89
  linux-image-snapdragon          4.4.0.1092.84

Ubuntu 14.04 LTS:
  linux-image-3.13.0-147-generic  3.13.0-147.196
  linux-image-3.13.0-147-generic-lpae  3.13.0-147.196
  linux-image-3.13.0-147-lowlatency  3.13.0-147.196
  linux-image-3.13.0-147-powerpc-e500  3.13.0-147.196
  linux-image-3.13.0-147-powerpc-e500mc  3.13.0-147.196
  linux-image-3.13.0-147-powerpc-smp  3.13.0-147.196
  linux-image-3.13.0-147-powerpc64-emb  3.13.0-147.196
  linux-image-3.13.0-147-powerpc64-smp  3.13.0-147.196
  linux-image-4.4.0-1019-aws      4.4.0-1019.19
  linux-image-4.4.0-124-generic   4.4.0-124.148~14.04.1
  linux-image-4.4.0-124-generic-lpae  4.4.0-124.148~14.04.1
  linux-image-4.4.0-124-lowlatency  4.4.0-124.148~14.04.1
  linux-image-4.4.0-124-powerpc-e500mc  4.4.0-124.148~14.04.1
  linux-image-4.4.0-124-powerpc-smp  4.4.0-124.148~14.04.1
  linux-image-4.4.0-124-powerpc64-emb  4.4.0-124.148~14.04.1
  linux-image-4.4.0-124-powerpc64-smp  4.4.0-124.148~14.04.1
  linux-image-aws                 4.4.0.1019.19
  linux-image-generic             3.13.0.147.157
  linux-image-generic-lpae        3.13.0.147.157
  linux-image-generic-lpae-lts-xenial  4.4.0.124.104
  linux-image-generic-lts-xenial  4.4.0.124.104
  linux-image-generic-pae         3.13.0.147.157
  linux-image-lowlatency          3.13.0.147.157
  linux-image-lowlatency-lts-xenial  4.4.0.124.104
  linux-image-powerpc-e500        3.13.0.147.157
  linux-image-powerpc-e500mc      3.13.0.147.157
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.124.104
  linux-image-powerpc-smp         3.13.0.147.157
  linux-image-powerpc-smp-lts-xenial  4.4.0.124.104
  linux-image-powerpc64-emb       3.13.0.147.157
  linux-image-powerpc64-emb-lts-xenial  4.4.0.124.104
  linux-image-powerpc64-smp       3.13.0.147.157
  linux-image-powerpc64-smp-lts-xenial  4.4.0.124.104

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

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.