[USN-4068-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-4068-1
July 23, 2019

linux, linux-aws, linux-gcp, linux-kvm, linux-oracle, linux-raspi2,
linux-snapdragon 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi2: Linux kernel for Raspberry Pi 2
- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

Adam Zabrocki discovered that the Intel i915 kernel mode graphics driver in
the Linux kernel did not properly restrict mmap() ranges in some
situations. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2019-11085)

It was discovered that a race condition leading to a use-after-free existed
in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux
kernel. The RDS protocol is blacklisted by default in Ubuntu. If enabled, a
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2019-11815)

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 18.04 LTS:
  linux-image-4.15.0-1018-oracle  4.15.0-1018.20
  linux-image-4.15.0-1037-gcp     4.15.0-1037.39
  linux-image-4.15.0-1039-kvm     4.15.0-1039.39
  linux-image-4.15.0-1041-raspi2  4.15.0-1041.44
  linux-image-4.15.0-1044-aws     4.15.0-1044.46
  linux-image-4.15.0-1058-snapdragon  4.15.0-1058.64
  linux-image-4.15.0-55-generic   4.15.0-55.60
  linux-image-4.15.0-55-generic-lpae  4.15.0-55.60
  linux-image-4.15.0-55-lowlatency  4.15.0-55.60
  linux-image-aws                 4.15.0.1044.43
  linux-image-gcp                 4.15.0.1037.39
  linux-image-generic             4.15.0.55.57
  linux-image-generic-lpae        4.15.0.55.57
  linux-image-kvm                 4.15.0.1039.39
  linux-image-lowlatency          4.15.0.55.57
  linux-image-oracle              4.15.0.1018.21
  linux-image-powerpc-e500mc      4.15.0.55.57
  linux-image-powerpc-smp         4.15.0.55.57
  linux-image-powerpc64-emb       4.15.0.55.57
  linux-image-powerpc64-smp       4.15.0.55.57
  linux-image-raspi2              4.15.0.1041.39
  linux-image-snapdragon          4.15.0.1058.61
  linux-image-virtual             4.15.0.55.57

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/4068-1
  CVE-2019-11085, CVE-2019-11815, CVE-2019-11833, CVE-2019-11884

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-55.60
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1044.46
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1037.39
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1039.39
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1018.20
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1041.44
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1058.64

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