[USN-4076-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-4076-1
July 25, 2019

linux, linux-aws, linux-kvm, linux-raspi2 vulnerabilities
==========================================================================

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

- 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-kvm: Linux kernel for cloud environments
- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

It was discovered that a race condition existed in the Serial Attached SCSI
(SAS) implementation in the Linux kernel. A local attacker could possibly
use this to cause a denial of service (system crash) or execute arbitrary
code. (CVE-2018-20836)

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)

It was discovered that the Linux kernel on ARM processors allowed a tracing
process to modify a syscall after a seccomp decision had been made on that
syscall. A local attacker could possibly use this to bypass seccomp
restrictions. (CVE-2019-2054)

Hugues Anguelkov discovered that the Broadcom Wifi driver in the Linux
kernel did not properly prevent remote firmware events from being processed
for USB Wifi devices. A physically proximate attacker could use this to
send firmware events to the device. (CVE-2019-9503)

It was discovered that an integer overflow existed in the Freescale
(PowerPC) hypervisor manager in the Linux kernel. A local attacker with
write access to /dev/fsl-hv could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2019-10142)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1052-kvm      4.4.0-1052.59
  linux-image-4.4.0-1088-aws      4.4.0-1088.99
  linux-image-4.4.0-1117-raspi2   4.4.0-1117.126
  linux-image-4.4.0-157-generic   4.4.0-157.185
  linux-image-4.4.0-157-generic-lpae  4.4.0-157.185
  linux-image-4.4.0-157-lowlatency  4.4.0-157.185
  linux-image-4.4.0-157-powerpc-e500mc  4.4.0-157.185
  linux-image-4.4.0-157-powerpc-smp  4.4.0-157.185
  linux-image-4.4.0-157-powerpc64-emb  4.4.0-157.185
  linux-image-4.4.0-157-powerpc64-smp  4.4.0-157.185
  linux-image-aws                 4.4.0.1088.91
  linux-image-generic             4.4.0.157.165
  linux-image-generic-lpae        4.4.0.157.165
  linux-image-kvm                 4.4.0.1052.52
  linux-image-lowlatency          4.4.0.157.165
  linux-image-powerpc-e500mc      4.4.0.157.165
  linux-image-powerpc-smp         4.4.0.157.165
  linux-image-powerpc64-emb       4.4.0.157.165
  linux-image-powerpc64-smp       4.4.0.157.165
  linux-image-raspi2              4.4.0.1117.117
  linux-image-virtual             4.4.0.157.165

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/4076-1
  CVE-2018-20836, CVE-2019-10142, CVE-2019-11833, CVE-2019-11884,
  CVE-2019-2054, CVE-2019-9503

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-157.185
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1088.99
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1052.59
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1117.126

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