[USN-3847-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3847-1
December 20, 2018

linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem,
linux-raspi2 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 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-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-oem: Linux kernel for OEM processors
- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

It was discovered that a race condition existed in the raw MIDI driver for
the Linux kernel, leading to a double free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2018-10902)

It was discovered that an integer overrun vulnerability existed in the
POSIX timers implementation in the Linux kernel. A local attacker could use
this to cause a denial of service. (CVE-2018-12896)

Noam Rathaus discovered that a use-after-free vulnerability existed in the
Infiniband implementation in the Linux kernel. An attacker could use this
to cause a denial of service (system crash). (CVE-2018-14734)

It was discovered that the YUREX USB device driver for the Linux kernel did
not properly restrict user space reads or writes. A physically proximate
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2018-16276)

It was discovered that the BPF verifier in the Linux kernel did not
correctly compute numeric bounds in some situations. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2018-18445)

Kanda Motohiro discovered that writing extended attributes to an XFS file
system in the Linux kernel in certain situations could cause an error
condition to occur. A local attacker could use this to cause a denial of
service. (CVE-2018-18690)

It was discovered that an integer overflow vulnerability existed in the
CDROM driver of the Linux kernel. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2018-18710)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1026-gcp     4.15.0-1026.27
  linux-image-4.15.0-1028-kvm     4.15.0-1028.28
  linux-image-4.15.0-1030-oem     4.15.0-1030.35
  linux-image-4.15.0-1030-raspi2  4.15.0-1030.32
  linux-image-4.15.0-1031-aws     4.15.0-1031.33
  linux-image-4.15.0-1036-azure   4.15.0-1036.38
  linux-image-4.15.0-43-generic   4.15.0-43.46
  linux-image-4.15.0-43-generic-lpae  4.15.0-43.46
  linux-image-4.15.0-43-lowlatency  4.15.0-43.46
  linux-image-4.15.0-43-snapdragon  4.15.0-43.46
  linux-image-aws                 4.15.0.1031.30
  linux-image-azure               4.15.0.1036.36
  linux-image-gcp                 4.15.0.1026.28
  linux-image-generic             4.15.0.43.45
  linux-image-generic-lpae        4.15.0.43.45
  linux-image-gke                 4.15.0.1026.28
  linux-image-kvm                 4.15.0.1028.28
  linux-image-lowlatency          4.15.0.43.45
  linux-image-oem                 4.15.0.1030.35
  linux-image-raspi2              4.15.0.1030.28
  linux-image-snapdragon          4.15.0.43.45

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/usn/usn-3847-1
  CVE-2018-10902, CVE-2018-12896, CVE-2018-14734, CVE-2018-16276,
  CVE-2018-18445, CVE-2018-18690, CVE-2018-18710

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-43.46
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1031.33
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1036.38
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1026.27
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1028.28
  https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1030.35
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1030.32

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