=========================================================================
Ubuntu Security Notice USN-4093-1
August 13, 2019

linux, linux-hwe, linux-azure, linux-gcp, linux-kvm, linux-raspi2,
linux-snapdragon vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 19.04
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

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

Details:

It was discovered that a heap buffer overflow existed in the Marvell
Wireless LAN device driver for the Linux kernel. An attacker could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2019-10126)

Andrei Vlad Lutas and Dan Lutas discovered that some x86 processors
incorrectly handle SWAPGS instructions during speculative execution. A
local attacker could use this to expose sensitive information (kernel
memory). (CVE-2019-1125)

It was discovered that the PowerPC dlpar implementation in the Linux kernel
did not properly check for allocation errors in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2019-12614)

It was discovered that a NULL pointer dereference vulnerability existed in
the Near-field communication (NFC) implementation in the Linux kernel. A
local attacker could use this to cause a denial of service (system crash).
(CVE-2019-12984)

Jann Horn discovered a use-after-free vulnerability in the Linux kernel
when accessing LDT entries in some situations. A local attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2019-13233)

Jann Horn discovered that the ptrace implementation in the Linux kernel did
not properly record credentials in some situations. A local attacker could
use this to cause a denial of service (system crash) or possibly gain
administrative privileges. (CVE-2019-13272)

It was discovered that the Marvell Wireless LAN device driver in the Linux
kernel did not properly validate the BSS descriptor. A local attacker could
possibly use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2019-3846)

Update instructions:

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

Ubuntu 19.04:
  linux-image-5.0.0-1013-gcp      5.0.0-1013.13
  linux-image-5.0.0-1013-kvm      5.0.0-1013.14
  linux-image-5.0.0-1014-azure    5.0.0-1014.14
  linux-image-5.0.0-1014-raspi2   5.0.0-1014.14
  linux-image-5.0.0-1018-snapdragon  5.0.0-1018.19
  linux-image-5.0.0-25-generic    5.0.0-25.26
  linux-image-5.0.0-25-generic-lpae  5.0.0-25.26
  linux-image-5.0.0-25-lowlatency  5.0.0-25.26
  linux-image-azure               5.0.0.1014.13
  linux-image-gcp                 5.0.0.1013.13
  linux-image-generic             5.0.0.25.26
  linux-image-generic-lpae        5.0.0.25.26
  linux-image-gke                 5.0.0.1013.13
  linux-image-kvm                 5.0.0.1013.13
  linux-image-lowlatency          5.0.0.25.26
  linux-image-raspi2              5.0.0.1014.11
  linux-image-snapdragon          5.0.0.1018.11
  linux-image-virtual             5.0.0.25.26

Ubuntu 18.04 LTS:
  linux-image-5.0.0-1014-azure    5.0.0-1014.14~18.04.1
  linux-image-5.0.0-25-generic    5.0.0-25.26~18.04.1
  linux-image-5.0.0-25-generic-lpae  5.0.0-25.26~18.04.1
  linux-image-5.0.0-25-lowlatency  5.0.0-25.26~18.04.1
  linux-image-azure               5.0.0.1014.25
  linux-image-generic-hwe-18.04   5.0.0.25.82
  linux-image-generic-lpae-hwe-18.04  5.0.0.25.82
  linux-image-lowlatency-hwe-18.04  5.0.0.25.82
  linux-image-snapdragon-hwe-18.04  5.0.0.25.82
  linux-image-virtual-hwe-18.04   5.0.0.25.82

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:
  https://usn.ubuntu.com/4093-1
  CVE-2019-10126, CVE-2019-1125, CVE-2019-12614, CVE-2019-12984,
  CVE-2019-13233, CVE-2019-13272, CVE-2019-3846

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.0.0-25.26
  https://launchpad.net/ubuntu/+source/linux-azure/5.0.0-1014.14
  https://launchpad.net/ubuntu/+source/linux-gcp/5.0.0-1013.13
  https://launchpad.net/ubuntu/+source/linux-kvm/5.0.0-1013.14
  https://launchpad.net/ubuntu/+source/linux-raspi2/5.0.0-1014.14
  https://launchpad.net/ubuntu/+source/linux-snapdragon/5.0.0-1018.19
  https://launchpad.net/ubuntu/+source/linux-azure/5.0.0-1014.14~18.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe/5.0.0-25.26~18.04.1