USN-3910-1: Linux kernel vulnerabilities

15 March 2019

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon processors

Details

It was discovered that the f2fs filesystem implementation in the Linux
kernel did not handle the noflush_merge mount option correctly. An attacker
could use this to cause a denial of service (system crash).
(CVE-2017-18241)

It was discovered that the procfs filesystem did not properly handle
processes mapping some memory elements onto files. A local attacker could
use this to block utilities that examine the procfs filesystem to report
operating system state, such as ps(1). (CVE-2018-1120)

Hui Peng and Mathias Payer discovered that the Option USB High Speed driver
in the Linux kernel did not properly validate metadata received from the
device. A physically proximate attacker could use this to cause a denial of
service (system crash). (CVE-2018-19985)

It was discovered that multiple integer overflows existed in the hugetlbfs
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service (system crash). (CVE-2018-7740)

Jann Horn discovered a race condition in the fork() system call in the
Linux kernel. A local attacker could use this to gain access to services
that cache authorizations. (CVE-2019-6133)

Update instructions

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

Ubuntu 16.04

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.

Related notices

  • USN-3934-2: libpolkit-backend-1-0, policykit-1
  • USN-3752-2: linux-image-4.15.0-33-generic, linux-image-generic-hwe-16.04, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-33-lowlatency, linux-hwe, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-33-generic-lpae
  • USN-4118-1: linux-aws-hwe, linux-aws, linux-image-aws-hwe, linux-image-aws, linux-image-4.15.0-1047-aws
  • USN-3752-1: linux-image-gke, linux-image-4.15.0-33-generic, linux-image-4.15.0-1020-kvm, linux-image-generic, linux-image-lowlatency, linux-aws, linux-image-raspi2, linux-image-4.15.0-33-lowlatency, linux-kvm, linux-image-4.15.0-1020-aws, linux-image-4.15.0-33-generic-lpae, linux-raspi2, linux-image-generic-lpae, linux, linux-image-snapdragon, linux-image-gcp, linux-image-4.15.0-1018-gcp, linux-image-4.15.0-1021-raspi2, linux-gcp, linux-image-kvm, linux-image-aws, linux-image-4.15.0-33-snapdragon
  • USN-3934-1: libpolkit-backend-1-0, policykit-1
  • USN-4115-1: linux-image-gke, linux-image-generic-hwe-16.04, linux-image-powerpc-smp, linux-image-4.15.0-60-generic, linux-image-generic, linux-hwe, linux-image-lowlatency, linux-image-4.15.0-60-lowlatency, linux-oracle, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-60-generic-lpae, linux-image-powerpc64-emb, linux-image-virtual, linux-image-lowlatency-hwe-16.04, linux-image-raspi2, linux-image-oem, linux-kvm, linux-image-virtual-hwe-16.04, linux-image-oracle, linux-image-4.15.0-1044-raspi2, linux-image-4.15.0-1022-oracle, linux-raspi2, linux-image-generic-lpae, linux-image-azure, linux, linux-image-gcp, linux-gke-4.15, linux-image-4.15.0-1043-kvm, linux-image-4.15.0-1041-gcp, linux-image-4.15.0-1041-gke, linux-image-4.15.0-1056-azure, linux-gcp, linux-image-kvm, linux-image-powerpc-e500mc, linux-image-powerpc64-smp, linux-azure, linux-image-gke-4.15
  • USN-3903-1: linux-image-gke, linux-image-4.18.0-16-lowlatency, linux-image-generic, linux-image-lowlatency, linux-image-4.18.0-1010-raspi2, linux-image-raspi2, linux-image-4.18.0-1007-gcp, linux-image-4.18.0-16-generic, linux-kvm, linux-raspi2, linux-image-generic-lpae, linux-image-azure, linux, linux-image-snapdragon, linux-image-gcp, linux-image-4.18.0-1008-kvm, linux-image-4.18.0-16-generic-lpae, linux-gcp, linux-image-4.18.0-16-snapdragon, linux-image-kvm, linux-azure, linux-image-4.18.0-1013-azure
  • USN-3908-2: linux-image-3.13.0-166-lowlatency, linux-image-3.13.0-166-generic, linux-image-3.13.0-166-generic-lpae, linux-lts-trusty, linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty
  • USN-3910-2: linux-image-generic-lts-xenial, linux-image-4.4.0-143-powerpc64-smp, linux-image-4.4.0-1039-aws, linux-image-4.4.0-143-powerpc-smp, linux-image-4.4.0-143-powerpc64-emb, linux-aws, linux-image-4.4.0-143-generic-lpae, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-virtual-lts-xenial, linux-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-143-lowlatency, linux-image-4.4.0-143-powerpc-e500mc, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-143-generic, linux-image-powerpc64-smp-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-aws
  • USN-3752-3: linux-image-gke, linux-image-azure, linux-image-azure-edge, linux-gcp, linux-image-gcp, linux-oem, linux-image-4.15.0-1018-gcp, linux-image-4.15.0-1022-azure, linux-azure, linux-image-oem, linux-image-4.15.0-1017-oem
  • USN-3901-2: linux-image-4.15.0-1028-gcp, linux-image-gke, linux-image-generic-hwe-16.04, linux-image-4.15.0-1033-aws, linux-hwe, linux-oracle, linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency-hwe-16.04, linux-image-aws-hwe, linux-image-4.15.0-46-generic-lpae, linux-image-oem, linux-image-oracle, linux-image-4.15.0-46-lowlatency, linux-image-azure, linux-image-gcp, linux-aws-hwe, linux-image-4.15.0-1009-oracle, linux-gcp, linux-azure, linux-image-4.15.0-1040-azure, linux-image-4.15.0-46-generic
  • USN-3901-1: linux-image-4.15.0-1028-gcp, linux-image-gke, linux-image-generic, linux-image-4.15.0-1033-aws, linux-image-lowlatency, linux-oracle, linux-aws, linux-image-raspi2, linux-image-4.15.0-46-generic-lpae, linux-image-oem, linux-kvm, linux-image-oracle, linux-image-4.15.0-46-lowlatency, linux-image-4.15.0-1032-raspi2, linux-raspi2, linux-image-generic-lpae, linux, linux-image-4.15.0-46-snapdragon, linux-image-snapdragon, linux-image-gcp, linux-image-4.15.0-1034-oem, linux-image-4.15.0-1030-kvm, linux-image-4.15.0-1009-oracle, linux-gcp, linux-image-kvm, linux-oem, linux-image-aws, linux-image-4.15.0-46-generic
  • USN-3908-1: linux-image-3.13.0-166-lowlatency, linux-image-3.13.0-166-powerpc-e500, linux-image-3.13.0-166-powerpc-e500mc, linux-image-generic-lpae, linux, linux-image-3.13.0-166-powerpc-smp, linux-image-powerpc64-emb, linux-image-virtual, linux-image-powerpc-smp, linux-image-3.13.0-166-powerpc64-smp, linux-image-lowlatency, linux-image-powerpc-e500mc, linux-image-3.13.0-166-generic, linux-image-generic, linux-image-powerpc64-smp, linux-image-3.13.0-166-generic-lpae, linux-image-3.13.0-166-powerpc64-emb, linux-image-powerpc-e500
  • USN-3903-2: linux-image-snapdragon-hwe-18.04, linux-image-azure, linux-image-4.18.0-16-lowlatency, linux-image-4.18.0-16-snapdragon, linux-image-4.18.0-16-generic, linux-image-lowlatency-hwe-18.04, linux-azure, linux-hwe, linux-image-generic-lpae-hwe-18.04, linux-image-4.18.0-16-generic-lpae, linux-image-generic-hwe-18.04, linux-image-4.18.0-1013-azure