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USN-3901-1: Linux kernel vulnerabilities

5 March 2019

Several security issues were fixed in the Linux kernel.

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Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

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Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-oem - Linux kernel for OEM processors
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

Jann Horn discovered that the userfaultd implementation in the Linux kernel
did not properly restrict access to certain ioctls. A local attacker could
use this possibly to modify files. (CVE-2018-18397)

It was discovered that the crypto subsystem of the Linux kernel leaked
uninitialized memory to user space in some situations. A local attacker
could use this to expose sensitive information (kernel memory).
(CVE-2018-19854)

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)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 18.04

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.

References

Related notices

  • USN-3903-2: linux-azure, linux-image-snapdragon-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-azure, linux-image-generic-hwe-18.04, linux-image-4.18.0-16-generic, linux-image-4.18.0-1013-azure, linux-image-4.18.0-16-snapdragon, linux-image-4.18.0-16-generic-lpae, linux-hwe, linux-image-4.18.0-16-lowlatency, linux-image-generic-lpae-hwe-18.04, linux-image-lowlatency-hwe-18.04
  • USN-3901-2: linux-image-4.15.0-1033-aws, linux-azure, linux-image-generic-hwe-16.04, linux-image-4.15.0-46-lowlatency, linux-image-gcp, linux-hwe, linux-image-4.15.0-1028-gcp, linux-aws-hwe, linux-image-aws-hwe, linux-image-4.15.0-46-generic-lpae, linux-image-4.15.0-1040-azure, linux-image-azure, linux-image-4.15.0-46-generic, linux-image-virtual-hwe-16.04, linux-image-gke, linux-gcp, linux-image-generic-lpae-hwe-16.04, linux-image-oem, linux-image-4.15.0-1009-oracle, linux-image-oracle, linux-oracle, linux-image-lowlatency-hwe-16.04
  • USN-3903-1: linux-azure, linux-image-4.18.0-1007-gcp, linux-image-gcp, linux-image-4.18.0-16-generic-lpae, linux-raspi2, linux-kvm, linux-image-kvm, linux-image-generic, linux-image-lowlatency, linux-image-4.18.0-16-lowlatency, linux-image-4.18.0-1008-kvm, linux-image-generic-lpae, linux-image-4.18.0-1010-raspi2, linux-image-azure, linux-image-snapdragon, linux-image-4.18.0-16-generic, linux-image-4.18.0-1013-azure, linux, linux-image-gke, linux-gcp, linux-image-raspi2, linux-image-4.18.0-16-snapdragon
  • USN-3878-1: linux-image-4.18.0-1008-aws, linux-image-4.18.0-14-generic, linux-image-4.18.0-1006-gcp, linux-image-gcp, linux-raspi2, linux-kvm, linux-image-kvm, linux-image-4.18.0-14-lowlatency, linux-image-generic, linux-image-lowlatency, linux-image-generic-lpae, linux-aws, linux-image-aws, linux-image-snapdragon, linux-image-4.18.0-14-snapdragon, linux, linux-image-gke, linux-image-4.18.0-14-generic-lpae, linux-gcp, linux-image-4.18.0-1009-raspi2, linux-image-raspi2, linux-image-4.18.0-1007-kvm
  • USN-3872-1: linux-image-snapdragon-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-generic-hwe-18.04, linux-image-4.18.0-14-generic, linux-image-4.18.0-14-snapdragon, linux-image-4.18.0-14-lowlatency, linux-hwe, linux-image-4.18.0-14-generic-lpae, linux-image-generic-lpae-hwe-18.04, linux-image-lowlatency-hwe-18.04
  • USN-3878-2: linux-azure, linux-image-azure, linux-image-4.18.0-1008-azure
  • USN-3934-2: libpolkit-backend-1-0, policykit-1
  • USN-3934-1: libpolkit-backend-1-dev, libpolkit-agent-1-0, libpolkit-gobject-1-0, libpolkit-gobject-1-dev, libpolkit-backend-1-0, policykit-1, policykit-1-doc, gir1.2-polkit-1.0, libpolkit-agent-1-dev
  • USN-3910-2: linux-image-lowlatency-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-generic-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-143-powerpc-smp, linux-image-4.4.0-143-lowlatency, linux-lts-xenial, linux-aws, linux-image-4.4.0-143-powerpc-e500mc, linux-image-4.4.0-143-generic-lpae, linux-image-aws, linux-image-4.4.0-143-powerpc64-emb, linux-image-4.4.0-1039-aws, linux-image-4.4.0-143-powerpc64-smp, linux-image-4.4.0-143-generic, linux-image-powerpc-smp-lts-xenial, linux-image-virtual-lts-xenial, linux-image-powerpc64-emb-lts-xenial
  • USN-3910-1: linux-image-generic-lts-vivid, linux-image-powerpc-e500mc, linux-image-virtual-lts-utopic, linux-image-4.4.0-1041-kvm, linux-image-generic-lts-utopic, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-emb-lts-wily, linux-image-lowlatency-lts-utopic, linux-image-powerpc-smp-lts-vivid, linux-image-generic-lpae-lts-utopic, linux-image-generic-lpae-lts-vivid, linux-image-generic-lpae-lts-xenial, linux-image-powerpc64-smp-lts-vivid, linux-image-powerpc64-smp-lts-utopic, linux-image-powerpc64-smp-lts-wily, linux-image-virtual-lts-vivid, linux-image-generic-lts-xenial, linux-image-powerpc-smp, linux-raspi2, linux-kvm, linux-image-virtual, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc64-emb-lts-vivid, linux-image-powerpc64-emb, linux-image-kvm, linux-image-4.4.0-1077-aws, linux-image-4.4.0-143-powerpc-smp, linux-image-generic, linux-image-powerpc64-emb-lts-utopic, linux-image-lowlatency, linux-image-4.4.0-143-lowlatency, linux-image-generic-lpae, linux-image-powerpc-e500mc-lts-utopic, linux-aws, linux-image-4.4.0-143-powerpc-e500mc, linux-image-4.4.0-143-generic-lpae, linux-image-aws, linux-image-4.4.0-143-powerpc64-emb, linux-image-snapdragon, linux-image-4.4.0-143-powerpc64-smp, linux-image-lowlatency-lts-wily, linux, linux-image-4.4.0-143-generic, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-1104-raspi2, linux-image-powerpc64-smp, linux-snapdragon, linux-image-virtual-lts-wily, linux-image-virtual-lts-xenial, linux-image-4.4.0-1108-snapdragon, linux-image-powerpc-smp-lts-utopic, linux-image-lowlatency-lts-vivid, linux-image-powerpc-smp-lts-wily, linux-image-raspi2, linux-image-generic-lpae-lts-wily, linux-image-powerpc64-emb-lts-xenial, linux-image-generic-lts-wily, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc-e500mc-lts-wily
  • USN-3908-1: linux-image-powerpc-e500mc, linux-image-omap, linux-image-powerpc-e500, linux-image-3.13.0-166-lowlatency, linux-image-highbank, linux-image-3.13.0-166-powerpc64-smp, linux-image-3.13.0-166-powerpc-smp, linux-image-lowlatency-pae, linux-image-powerpc-smp, linux-image-generic-lts-trusty, linux-image-3.13.0-166-powerpc-e500, linux-image-3.13.0-166-generic-lpae, linux-image-virtual, linux-image-powerpc64-emb, linux-image-generic-lpae-lts-saucy, linux-image-generic, linux-image-lowlatency, linux-image-generic-lpae, linux-image-generic-lpae-lts-trusty, linux, linux-image-generic-lts-quantal, linux-image-3.13.0-166-powerpc64-emb, linux-image-powerpc64-smp, linux-image-3.13.0-166-powerpc-e500mc, linux-image-generic-pae, linux-image-3.13.0-166-generic, linux-image-generic-lts-saucy, linux-image-generic-lts-raring
  • USN-3908-2: linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-166-generic-lpae, linux-lts-trusty, linux-image-3.13.0-166-lowlatency, linux-image-3.13.0-166-generic

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