[USN-3696-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3696-1
July 02, 2018

linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon 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
- linux-snapdragon: Linux kernel for Snapdragon processors

Details:

It was discovered that an integer overflow existed in the perf subsystem of
the Linux kernel. A local attacker could use this to cause a denial of
service (system crash). (CVE-2017-18255)

Wei Fang discovered an integer overflow in the F2FS filesystem
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service. (CVE-2017-18257)

It was discovered that an information leak existed in the generic SCSI
driver in the Linux kernel. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2018-1000204)

It was discovered that the wait4() system call in the Linux kernel did not
properly validate its arguments in some situations. A local attacker could
possibly use this to cause a denial of service. (CVE-2018-10087)

It was discovered that the kill() system call implementation in the Linux
kernel did not properly validate its arguments in some situations. A local
attacker could possibly use this to cause a denial of service.
(CVE-2018-10124)

Julian Stecklina and Thomas Prescher discovered that FPU register states
(such as MMX, SSE, and AVX registers) which are lazily restored are
potentially vulnerable to a side channel attack. A local attacker could use
this to expose sensitive information. (CVE-2018-3665)

Jakub Jirasek discovered that multiple use-after-errors existed in the
USB/IP implementation in the Linux kernel. A local attacker could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2018-5814)

It was discovered that an information leak vulnerability existed in the
floppy driver in the Linux kernel. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2018-7755)

Seunghun Han discovered an information leak in the ACPI handling code in
the Linux kernel when handling early termination of ACPI table loading. A
local attacker could use this to expose sensitive informal (kernel address
locations). (CVE-2017-13695)

It was discovered that a memory leak existed in the Serial Attached SCSI
(SAS) implementation in the Linux kernel. A physically proximate attacker
could use this to cause a denial of service (memory exhaustion).
(CVE-2018-10021)

Update instructions:

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1029-kvm      4.4.0-1029.34
  linux-image-4.4.0-1062-aws      4.4.0-1062.71
  linux-image-4.4.0-1092-raspi2   4.4.0-1092.100
  linux-image-4.4.0-1095-snapdragon  4.4.0-1095.100
  linux-image-4.4.0-130-generic   4.4.0-130.156
  linux-image-4.4.0-130-generic-lpae  4.4.0-130.156
  linux-image-4.4.0-130-lowlatency  4.4.0-130.156
  linux-image-4.4.0-130-powerpc-e500mc  4.4.0-130.156
  linux-image-4.4.0-130-powerpc-smp  4.4.0-130.156
  linux-image-4.4.0-130-powerpc64-emb  4.4.0-130.156
  linux-image-4.4.0-130-powerpc64-smp  4.4.0-130.156
  linux-image-aws                 4.4.0.1062.64
  linux-image-generic             4.4.0.130.136
  linux-image-generic-lpae        4.4.0.130.136
  linux-image-kvm                 4.4.0.1029.28
  linux-image-lowlatency          4.4.0.130.136
  linux-image-powerpc-e500mc      4.4.0.130.136
  linux-image-powerpc-smp         4.4.0.130.136
  linux-image-powerpc64-emb       4.4.0.130.136
  linux-image-powerpc64-smp       4.4.0.130.136
  linux-image-raspi2              4.4.0.1092.92
  linux-image-snapdragon          4.4.0.1095.87

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-3696-1
  CVE-2017-13695, CVE-2017-18255, CVE-2017-18257, CVE-2018-1000204,
  CVE-2018-10021, CVE-2018-10087, CVE-2018-10124, CVE-2018-3665,
  CVE-2018-5814, CVE-2018-7755

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.4.0-130.156
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1062.71
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1029.34
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1092.100
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1095.100

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