USN-4069-1: Linux kernel vulnerabilities

23 July 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-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)

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-4076-1: linux-image-4.4.0-1117-raspi2, linux-kvm, linux-raspi2, linux-image-kvm, linux-image-4.4.0-1088-aws, linux-image-aws, linux-image-4.4.0-157-powerpc64-smp, linux-image-generic-lpae, linux-aws, linux-image-powerpc64-smp, linux, linux-image-virtual, linux-image-4.4.0-157-powerpc-smp, linux-image-powerpc-e500mc, linux-image-4.4.0-1052-kvm, linux-image-4.4.0-157-generic-lpae, linux-image-lowlatency, linux-image-raspi2, linux-image-powerpc64-emb, linux-image-generic, linux-image-powerpc-smp, linux-image-4.4.0-157-powerpc64-emb, linux-image-4.4.0-157-generic, linux-image-4.4.0-157-powerpc-e500mc, linux-image-4.4.0-157-lowlatency
  • USN-4069-2: linux-image-generic-hwe-18.04, linux-image-5.0.0-23-lowlatency, linux-image-generic-lpae-hwe-18.04, linux-image-lowlatency-hwe-18.04, linux-hwe, linux-image-snapdragon-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-5.0.0-23-generic-lpae, linux-image-5.0.0-23-generic
  • USN-4095-1: linux-image-4.4.0-159-powerpc64-smp, linux-raspi2, linux-kvm, linux-image-4.4.0-1122-snapdragon, linux-image-kvm, linux-image-snapdragon, linux-image-aws, linux-image-generic-lpae, linux-aws, linux-image-powerpc64-smp, linux-snapdragon, linux, linux-image-4.4.0-1090-aws, linux-image-virtual, linux-image-4.4.0-159-powerpc64-emb, linux-image-4.4.0-1054-kvm, linux-image-powerpc-e500mc, linux-image-4.4.0-159-lowlatency, linux-image-4.4.0-159-powerpc-smp, linux-image-lowlatency, linux-image-raspi2, linux-image-powerpc64-emb, linux-image-generic, linux-image-powerpc-smp, linux-image-4.4.0-159-generic-lpae, linux-image-4.4.0-159-powerpc-e500mc, linux-image-4.4.0-1118-raspi2, linux-image-4.4.0-159-generic
  • USN-4068-1: linux-raspi2, linux-kvm, linux-oracle, linux-image-kvm, linux-image-snapdragon, linux-image-4.15.0-1037-gcp, linux-image-4.15.0-55-generic-lpae, linux-image-aws, linux-image-generic-lpae, linux-aws, linux-image-4.15.0-1044-aws, linux-image-powerpc64-smp, linux-image-4.15.0-55-generic, linux-snapdragon, linux, linux-image-4.15.0-1039-kvm, linux-image-virtual, linux-image-gcp, linux-image-powerpc-e500mc, linux-image-oracle, linux-image-4.15.0-1058-snapdragon, linux-image-lowlatency, linux-image-4.15.0-1041-raspi2, linux-image-raspi2, linux-image-powerpc64-emb, linux-gcp, linux-image-4.15.0-55-lowlatency, linux-image-generic, linux-image-powerpc-smp, linux-image-4.15.0-1018-oracle
  • USN-4068-2: linux-image-generic-hwe-16.04, linux-image-4.15.0-55-generic, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-1037-gcp, linux-image-4.15.0-55-generic-lpae, linux-image-lowlatency-hwe-16.04, linux-hwe, linux-image-oem, linux-image-gcp, linux-gcp, linux-image-4.15.0-55-lowlatency, linux-image-virtual-hwe-16.04, linux-image-gke
  • USN-4145-1: linux-raspi2, linux-kvm, linux-image-4.4.0-165-lowlatency, linux-image-kvm, linux-image-snapdragon, linux-image-4.4.0-165-powerpc64-emb, linux-image-aws, linux-image-4.4.0-1059-kvm, linux-image-generic-lpae, linux-aws, linux-image-powerpc64-smp, linux-snapdragon, linux, linux-image-4.4.0-165-powerpc64-smp, linux-image-virtual, linux-image-4.4.0-165-powerpc-smp, linux-image-4.4.0-165-generic, linux-image-4.4.0-165-powerpc-e500mc, linux-image-4.4.0-1127-snapdragon, linux-image-powerpc-e500mc, linux-image-lowlatency, linux-image-4.4.0-165-generic-lpae, linux-image-raspi2, linux-image-powerpc64-emb, linux-image-4.4.0-1095-aws, linux-image-generic, linux-image-powerpc-smp, linux-image-4.4.0-1123-raspi2
  • USN-4118-1: linux-image-aws-hwe, linux-image-aws, linux-aws-hwe, linux-image-4.15.0-1047-aws, linux-aws
  • USN-4095-2: linux-image-4.4.0-159-powerpc64-smp, linux-image-aws, linux-aws, linux-image-4.4.0-1050-aws, linux-image-powerpc64-smp-lts-xenial, linux-image-generic-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-lts-xenial, linux-image-4.4.0-159-powerpc64-emb, linux-image-4.4.0-159-lowlatency, linux-image-4.4.0-159-powerpc-smp, linux-image-lowlatency-lts-xenial, linux-image-virtual-lts-xenial, linux-image-4.4.0-159-generic-lpae, linux-image-4.4.0-159-powerpc-e500mc, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-159-generic
  • USN-4115-1: linux-image-generic-hwe-16.04, linux-raspi2, linux-kvm, linux-oracle, linux-image-4.15.0-1041-gcp, linux-image-kvm, linux-image-4.15.0-1056-azure, linux-image-4.15.0-1041-gke, linux-azure, linux-image-generic-lpae, linux-image-gke, linux-image-powerpc64-smp, linux-image-4.15.0-60-generic-lpae, linux-image-4.15.0-60-lowlatency, linux, linux-image-virtual, linux-image-gcp, linux-gke-4.15, linux-image-powerpc-e500mc, linux-image-oracle, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-60-generic, linux-image-lowlatency, linux-hwe, linux-image-oem, linux-image-raspi2, linux-image-powerpc64-emb, linux-gcp, linux-image-generic, linux-image-powerpc-smp, linux-image-4.15.0-1044-raspi2, linux-image-gke-4.15, linux-image-4.15.0-1043-kvm, linux-image-lowlatency-hwe-16.04, linux-image-azure, linux-image-virtual-hwe-16.04, linux-image-4.15.0-1022-oracle