A Linux kernel security update has been released for Ubuntu Linux 18.04 LTS and 16.04 LTS.

USN-4345-1: Linux kernel vulnerabilities

=========================================================================
Ubuntu Security Notice USN-4345-1
April 28, 2020

linux, linux-aws, linux-aws-hwe, linux-azure, linux-gcp,
linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, linux-oracle,
linux-raspi2, linux-snapdragon vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-gke-4.15: Linux kernel for Google Container Engine (GKE) 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
- linux-snapdragon: Linux kernel for Snapdragon processors
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

Al Viro discovered that the Linux kernel for s390x systems did not properly
perform page table upgrades for kernel sections that use secondary address
mode. A local attacker could use this to cause a denial of service (system
crash) or execute arbitrary code. (CVE-2020-11884)

It was discovered that the Intel Wi-Fi driver in the Linux kernel did not
properly check for errors in some situations. A local attacker could
possibly use this to cause a denial of service (system crash).
(CVE-2019-16234)

Tristan Madani discovered that the block I/O tracing implementation in the
Linux kernel contained a race condition. A local attacker could use this to
cause a denial of service (system crash) or possibly expose sensitive
information. (CVE-2019-19768)

It was discovered that the vhost net driver in the Linux kernel contained a
stack buffer overflow. A local attacker with the ability to perform ioctl()
calls on /dev/vhost-net could use this to cause a denial of service (system
crash). (CVE-2020-10942)

It was discovered that the OV51x USB Camera device driver in the Linux
kernel did not properly validate device metadata. A physically proximate
attacker could use this to cause a denial of service (system crash).
(CVE-2020-11608)

It was discovered that the STV06XX USB Camera device driver in the Linux
kernel did not properly validate device metadata. A physically proximate
attacker could use this to cause a denial of service (system crash).
(CVE-2020-11609)

It was discovered that the Xirlink C-It USB Camera device driver in the
Linux kernel did not properly validate device metadata. A physically
proximate attacker could use this to cause a denial of service (system
crash). (CVE-2020-11668)

It was discovered that the virtual terminal implementation in the Linux
kernel contained a race condition. A local attacker could possibly use this
to cause a denial of service (system crash) or expose sensitive
information. (CVE-2020-8648)

Jordy Zomer discovered that the floppy driver in the Linux kernel did not
properly check for errors in some situations. A local attacker could
possibly use this to cause a denial of service (system crash) or possibly
expose sensitive information. (CVE-2020-9383)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1038-oracle 4.15.0-1038.42
linux-image-4.15.0-1058-gke 4.15.0-1058.61
linux-image-4.15.0-1059-kvm 4.15.0-1059.60
linux-image-4.15.0-1061-raspi2 4.15.0-1061.65
linux-image-4.15.0-1066-aws 4.15.0-1066.70
linux-image-4.15.0-1077-snapdragon 4.15.0-1077.84
linux-image-4.15.0-1080-oem 4.15.0-1080.90
linux-image-4.15.0-99-generic 4.15.0-99.100
linux-image-4.15.0-99-generic-lpae 4.15.0-99.100
linux-image-4.15.0-99-lowlatency 4.15.0-99.100
linux-image-aws-lts-18.04 4.15.0.1066.69
linux-image-generic 4.15.0.99.89
linux-image-generic-lpae 4.15.0.99.89
linux-image-gke 4.15.0.1058.62
linux-image-gke-4.15 4.15.0.1058.62
linux-image-kvm 4.15.0.1059.59
linux-image-lowlatency 4.15.0.99.89
linux-image-oem 4.15.0.1080.84
linux-image-oracle-lts-18.04 4.15.0.1038.47
linux-image-powerpc-e500mc 4.15.0.99.89
linux-image-powerpc-smp 4.15.0.99.89
linux-image-powerpc64-emb 4.15.0.99.89
linux-image-powerpc64-smp 4.15.0.99.89
linux-image-raspi2 4.15.0.1061.59
linux-image-snapdragon 4.15.0.1077.80
linux-image-virtual 4.15.0.99.89

Ubuntu 16.04 LTS:
linux-image-4.15.0-1038-oracle 4.15.0-1038.42~16.04.1
linux-image-4.15.0-1061-gcp 4.15.0-1061.65
linux-image-4.15.0-1066-aws 4.15.0-1066.70~16.04.1
linux-image-4.15.0-1082-azure 4.15.0-1082.92~16.04.1
linux-image-4.15.0-99-generic 4.15.0-99.100~16.04.1
linux-image-4.15.0-99-generic-lpae 4.15.0-99.100~16.04.1
linux-image-4.15.0-99-lowlatency 4.15.0-99.100~16.04.1
linux-image-aws-hwe 4.15.0.1066.66
linux-image-azure 4.15.0.1082.81
linux-image-azure-edge 4.15.0.1082.81
linux-image-gcp 4.15.0.1061.75
linux-image-generic-hwe-16.04 4.15.0.99.106
linux-image-generic-lpae-hwe-16.04 4.15.0.99.106
linux-image-gke 4.15.0.1061.75
linux-image-lowlatency-hwe-16.04 4.15.0.99.106
linux-image-oem 4.15.0.99.106
linux-image-oracle 4.15.0.1038.31
linux-image-virtual-hwe-16.04 4.15.0.99.106

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/4345-1
CVE-2019-16234, CVE-2019-19768, CVE-2020-10942, CVE-2020-11608,
CVE-2020-11609, CVE-2020-11668, CVE-2020-11884, CVE-2020-8648,
CVE-2020-9383

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-99.100
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1066.70
  https://launchpad.net/ubuntu/+source/linux-gke-4.15/4.15.0-1058.61
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1059.60
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1080.90
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1038.42
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1061.65
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1077.84
  https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1066.70~16.04.1
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1082.92~16.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1061.65
  https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-99.100~16.04.1
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1038.42~16.04.1