[USN-3698-1] Linux kernel vulnerabilities

[Steve Beattie]

==========================================================================
Ubuntu Security Notice USN-3698-1
July 02, 2018

linux vulnerabilities
==========================================================================

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

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel

Details:

It was discovered that the nested KVM implementation in the Linux kernel in
some situations did not properly prevent second level guests from reading
and writing the hardware CR8 register. A local attacker in a guest could
use this to cause a denial of service (system crash). (CVE-2017-12154)

Fan Wu, Haoran Qiu, and Shixiong Zhao discovered that the associative array
implementation in the Linux kernel sometimes did not properly handle adding
a new entry. A local attacker could use this to cause a denial of service
(system crash). (CVE-2017-12193)

It was discovered that a race condition existed in the ALSA subsystem of
the Linux kernel when creating and deleting a port via ioctl(). A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-15265)

It was discovered that a null pointer dereference vulnerability existed in
the DCCP protocol implementation in the Linux kernel. A local attacker
could use this to cause a denial of service (system crash). (CVE-2018-1130)

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)

Wang Qize discovered that an information disclosure vulnerability existed
in the SMBus driver for ACPI Embedded Controllers in the Linux kernel. A
local attacker could use this to expose sensitive information (kernel
pointer addresses). (CVE-2018-5750)

It was discovered that the SCTP Protocol implementation in the Linux kernel
did not properly validate userspace provided payload lengths in some
situations. A local attacker could use this to cause a denial of service
(system crash). (CVE-2018-5803)

It was discovered that an integer overflow error existed in the futex
implementation in the Linux kernel. A local attacker could use this to
cause a denial of service (system crash). (CVE-2018-6927)

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)

It was discovered that a memory leak existed in the SAS driver subsystem of
the Linux kernel. A local attacker could use this to cause a denial of
service (memory exhaustion). (CVE-2018-7757)

Update instructions:

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

Ubuntu 14.04 LTS:
  linux-image-3.13.0-153-generic  3.13.0-153.203
  linux-image-3.13.0-153-generic-lpae  3.13.0-153.203
  linux-image-3.13.0-153-lowlatency  3.13.0-153.203
  linux-image-3.13.0-153-powerpc-e500  3.13.0-153.203
  linux-image-3.13.0-153-powerpc-e500mc  3.13.0-153.203
  linux-image-3.13.0-153-powerpc-smp  3.13.0-153.203
  linux-image-3.13.0-153-powerpc64-emb  3.13.0-153.203
  linux-image-3.13.0-153-powerpc64-smp  3.13.0-153.203
  linux-image-generic             3.13.0.153.163
  linux-image-generic-lpae        3.13.0.153.163
  linux-image-lowlatency          3.13.0.153.163
  linux-image-powerpc-e500        3.13.0.153.163
  linux-image-powerpc-e500mc      3.13.0.153.163
  linux-image-powerpc-smp         3.13.0.153.163
  linux-image-powerpc64-emb       3.13.0.153.163
  linux-image-powerpc64-smp       3.13.0.153.163

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-3698-1
  CVE-2017-12154, CVE-2017-12193, CVE-2017-15265, CVE-2018-1130,
  CVE-2018-3665, CVE-2018-5750, CVE-2018-5803, CVE-2018-6927,
  CVE-2018-7755, CVE-2018-7757

Package Information:
  https://launchpad.net/ubuntu/+source/linux/3.13.0-153.203

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