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USN-4069-1: Linux kernel vulnerabilities

23 July 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-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) 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 an integer overflow existed in the Linux kernel when
reference counting pages, leading to potential use-after-free issues. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2019-11487)

Jann Horn discovered that a race condition existed in the Linux kernel when
performing core dumps. A local attacker could use this to cause a denial of
service (system crash) or expose sensitive information. (CVE-2019-11599)

It was discovered that the ext4 file system implementation in the Linux
kernel did not properly zero out memory in some situations. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2019-11833)

It was discovered that the Bluetooth Human Interface Device Protocol (HIDP)
implementation in the Linux kernel did not properly verify strings were
NULL terminated in certain situations. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2019-11884)

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 19.04

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-4145-1: linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc64-emb-lts-wily, linux-image-generic-lpae-lts-xenial, linux-image-generic-lts-vivid, linux-image-4.4.0-1095-aws, linux-image-4.4.0-165-powerpc-smp, linux-image-powerpc64-emb-lts-utopic, linux-image-powerpc64-emb, linux-image-lowlatency-lts-utopic, linux-image-generic-lts-utopic, linux-image-powerpc64-emb-lts-vivid, linux-image-generic-lts-xenial, linux-image-virtual-lts-wily, linux-image-generic-lpae, linux, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-1123-raspi2, linux-image-4.4.0-165-generic-lpae, linux-image-4.4.0-165-powerpc-e500mc, linux-image-generic, linux-image-lowlatency-lts-wily, linux-image-powerpc64-smp, linux-image-generic-lpae-lts-utopic, linux-image-virtual-lts-xenial, linux-aws, linux-image-4.4.0-165-generic, linux-image-4.4.0-1059-kvm, linux-image-virtual-lts-vivid, linux-image-powerpc-smp-lts-utopic, linux-image-powerpc-e500mc-lts-wily, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc-e500mc, linux-image-powerpc-smp-lts-xenial, linux-snapdragon, linux-image-powerpc-smp-lts-vivid, linux-image-virtual, linux-image-powerpc-smp, linux-image-4.4.0-1127-snapdragon, linux-image-snapdragon, linux-kvm, linux-image-raspi2, linux-image-lowlatency-lts-vivid, linux-image-aws, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-165-lowlatency, linux-image-powerpc64-smp-lts-vivid, linux-image-lowlatency, linux-image-virtual-lts-utopic, linux-image-powerpc64-smp-lts-xenial, linux-raspi2, linux-image-generic-lts-wily, linux-image-generic-lpae-lts-wily, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-165-powerpc64-smp, linux-image-powerpc64-smp-lts-utopic, linux-image-kvm, linux-image-4.4.0-165-powerpc64-emb
  • USN-4118-1: linux-aws-hwe, linux-image-aws-hwe, linux-image-4.15.0-1047-aws, linux-aws, linux-image-aws
  • USN-4115-1: linux-image-4.15.0-1056-azure, linux-image-4.15.0-60-generic, linux-image-lowlatency-hwe-16.04, linux-image-azure, linux-oracle, linux-image-virtual-hwe-16.04-edge, linux-image-gcp, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-1041-gke, linux-hwe, linux-image-generic-lpae, linux, linux-image-gke, linux-image-gke-4.15, linux-image-generic-lpae-hwe-16.04-edge, linux-image-generic, linux-image-4.15.0-1043-kvm, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1041-gcp, linux-gcp, linux-image-generic-lpae-hwe-16.04, linux-image-virtual, linux-image-virtual-hwe-16.04, linux-gke-4.15, linux-kvm, linux-image-raspi2, linux-image-4.15.0-1022-oracle, linux-image-oem, linux-azure, linux-image-lowlatency, linux-image-oracle, linux-image-4.15.0-1044-raspi2, linux-raspi2, linux-image-4.15.0-60-generic-lpae, linux-image-generic-hwe-16.04, linux-image-kvm, linux-image-4.15.0-60-lowlatency
  • USN-4069-2: linux-hwe, linux-image-generic-lpae-hwe-18.04, linux-image-5.0.0-23-generic-lpae, linux-image-snapdragon-hwe-18.04, linux-image-5.0.0-23-lowlatency, linux-image-virtual-hwe-18.04, linux-image-lowlatency-hwe-18.04, linux-image-generic-hwe-18.04, linux-image-5.0.0-23-generic
  • USN-4095-1: linux-image-powerpc64-emb-lts-xenial, linux-image-powerpc64-emb-lts-wily, linux-image-4.4.0-159-powerpc64-emb, linux-image-generic-lpae-lts-xenial, linux-image-generic-lts-vivid, linux-image-4.4.0-159-powerpc-e500mc, linux-image-powerpc64-emb-lts-utopic, linux-image-powerpc64-emb, linux-image-lowlatency-lts-utopic, linux-image-generic-lts-utopic, linux-image-powerpc64-emb-lts-vivid, linux-image-generic-lts-xenial, linux-image-virtual-lts-wily, linux-image-generic-lpae, linux, linux-image-4.4.0-1118-raspi2, linux-image-generic-lpae-lts-vivid, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc-smp-lts-wily, linux-image-generic, linux-image-lowlatency-lts-wily, linux-image-powerpc64-smp, linux-image-generic-lpae-lts-utopic, linux-image-virtual-lts-xenial, linux-aws, linux-image-virtual-lts-vivid, linux-image-powerpc-smp-lts-utopic, linux-image-powerpc-e500mc-lts-wily, linux-image-powerpc64-smp-lts-wily, linux-image-4.4.0-1054-kvm, linux-image-powerpc-e500mc, linux-image-powerpc-smp-lts-xenial, linux-snapdragon, linux-image-powerpc-smp-lts-vivid, linux-image-virtual, linux-image-powerpc-smp, linux-image-snapdragon, linux-image-4.4.0-159-powerpc64-smp, linux-kvm, linux-image-4.4.0-1122-snapdragon, linux-image-lowlatency-lts-vivid, linux-image-raspi2, linux-image-aws, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc64-smp-lts-vivid, linux-image-lowlatency, linux-image-virtual-lts-utopic, linux-image-powerpc64-smp-lts-xenial, linux-raspi2, linux-image-generic-lts-wily, linux-image-generic-lpae-lts-wily, linux-image-lowlatency-lts-xenial, linux-image-powerpc64-smp-lts-utopic, linux-image-4.4.0-159-powerpc-smp, linux-image-4.4.0-159-generic-lpae, linux-image-4.4.0-1090-aws, linux-image-4.4.0-159-lowlatency, linux-image-4.4.0-159-generic, linux-image-kvm
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  • USN-4068-2: linux-image-oem, linux-hwe, linux-image-4.15.0-1037-gcp, linux-image-lowlatency-hwe-16.04, linux-image-gke, linux-image-4.15.0-55-generic, linux-gcp, linux-image-generic-lpae-hwe-16.04, linux-image-generic-hwe-16.04, linux-image-gcp, linux-image-virtual-hwe-16.04, linux-image-4.15.0-55-lowlatency, linux-image-4.15.0-55-generic-lpae
  • USN-4068-1: linux-image-lowlatency-hwe-16.04, linux-oracle, linux-image-4.15.0-1039-kvm, linux-image-virtual-hwe-16.04-edge, linux-image-gcp, linux-image-generic-hwe-16.04-edge, linux-image-4.15.0-1037-gcp, linux-image-generic-lpae, linux, linux-image-4.15.0-1044-aws, linux-image-generic-lpae-hwe-16.04-edge, linux-image-generic, linux-image-4.15.0-1018-oracle, linux-aws, linux-image-lowlatency-hwe-16.04-edge, linux-image-4.15.0-1058-snapdragon, linux-snapdragon, linux-gcp, linux-image-generic-lpae-hwe-16.04, linux-image-virtual, linux-image-virtual-hwe-16.04, linux-image-snapdragon, linux-kvm, linux-image-raspi2, linux-image-aws, linux-image-lowlatency, linux-image-oracle, linux-raspi2, linux-image-4.15.0-55-generic, linux-image-generic-hwe-16.04, linux-image-4.15.0-55-lowlatency, linux-image-4.15.0-1041-raspi2, linux-image-kvm, linux-image-4.15.0-55-generic-lpae
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