The following updates has been released for Ubuntu Linux:

USN-3769-2: Bind vulnerability
USN-3773-1: Ghostscript vulnerabilities
USN-3774-1: strongSwan vulnerability
USN-3775-1: Linux kernel vulnerabilities
USN-3775-2: Linux kernel (Trusty HWE) vulnerabilities
USN-3776-1: Linux kernel vulnerabilities
USN-3776-2: Linux kernel (Xenial HWE) vulnerabilities
USN-3777-1: Linux kernel vulnerabilities
USN-3777-2: Linux kernel (HWE) vulnerabilities

USN-3769-2: Bind vulnerability

==========================================================================
Ubuntu Security Notice USN-3769-2
October 01, 2018

bind9 vulnerability
==========================================================================

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

- Ubuntu 12.04 ESM

Summary:

Bind could be made to crash if it received specially crafted network
traffic.

Software Description:
- bind9: Internet Domain Name Server

Details:

USN-3769-1 fixed a vulnerability in Bind. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 It was discovered that Bind incorrectly handled the deny-answer-
 aliases feature. If this feature is enabled, a remote attacker could
 use this issue to cause Bind to crash, resulting in a denial of
 service.

Update instructions:

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

Ubuntu 12.04 ESM:
  bind9 1:9.8.1.dfsg.P1-4ubuntu0.26

In general, a standard system update will make all the necessary
changes.

References:
  https://usn.ubuntu.com/usn/usn-3769-2
  https://usn.ubuntu.com/usn/usn-3769-1
  CVE-2018-5740

USN-3773-1: Ghostscript vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3773-1
October 01, 2018

ghostscript vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in Ghostscript.

Software Description:
- ghostscript: PostScript and PDF interpreter

Details:

It was discovered that Ghostscript contained multiple security issues. If a
user or automated system were tricked into processing a specially crafted
file, a remote attacker could possibly use these issues to access arbitrary
files, execute arbitrary code, or cause a denial of service.

Update instructions:

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

Ubuntu 18.04 LTS:
ghostscript 9.25~dfsg+1-0ubuntu0.18.04.1
libgs9 9.25~dfsg+1-0ubuntu0.18.04.1

Ubuntu 16.04 LTS:
ghostscript 9.25~dfsg+1-0ubuntu0.16.04.1
libgs9 9.25~dfsg+1-0ubuntu0.16.04.1

Ubuntu 14.04 LTS:
ghostscript 9.25~dfsg+1-0ubuntu0.14.04.1
libgs9 9.25~dfsg+1-0ubuntu0.14.04.1

This update uses a new upstream release, which includes additional bug
fixes. In general, a standard system update will make all the necessary
changes.

References:
https://usn.ubuntu.com/usn/usn-3773-1
CVE-2018-16510, CVE-2018-17183

Package Information:
https://launchpad.net/ubuntu/+source/ghostscript/9.25~dfsg+1-0ubuntu0.18.04.1
https://launchpad.net/ubuntu/+source/ghostscript/9.25~dfsg+1-0ubuntu0.16.04.1
https://launchpad.net/ubuntu/+source/ghostscript/9.25~dfsg+1-0ubuntu0.14.04.1

USN-3774-1: strongSwan vulnerability

==========================================================================
Ubuntu Security Notice USN-3774-1
October 01, 2018

strongswan vulnerability
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

strongSwan could be made to crash or run programs if it received specially
crafted network traffic.

Software Description:
- strongswan: IPsec VPN solution

Details:

It was discovered that strongSwan incorrectly handled signature validation
in the gmp plugin. A remote attacker could use this issue to cause
strongSwan to crash, resulting in a denial of service, or possibly execute
arbitrary code.

Update instructions:

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

Ubuntu 18.04 LTS:
libstrongswan 5.6.2-1ubuntu2.3
strongswan 5.6.2-1ubuntu2.3

Ubuntu 16.04 LTS:
libstrongswan 5.3.5-1ubuntu3.8
strongswan 5.3.5-1ubuntu3.8

Ubuntu 14.04 LTS:
libstrongswan 5.1.2-0ubuntu2.11
strongswan 5.1.2-0ubuntu2.11

In general, a standard system update will make all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3774-1
CVE-2018-17540

Package Information:
https://launchpad.net/ubuntu/+source/strongswan/5.6.2-1ubuntu2.3
https://launchpad.net/ubuntu/+source/strongswan/5.3.5-1ubuntu3.8
https://launchpad.net/ubuntu/+source/strongswan/5.1.2-0ubuntu2.11

USN-3775-1: Linux kernel vulnerabilities

=========================================================================Ubuntu Security Notice USN-3775-1
October 01, 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 paravirtualization implementation in the Linux
kernel did not properly handle some indirect calls, reducing the
effectiveness of Spectre v2 mitigations for paravirtual guests. A local
attacker could use this to expose sensitive information. (CVE-2018-15594)

It was discovered that microprocessors utilizing speculative execution and
prediction of return addresses via Return Stack Buffer (RSB) may allow
unauthorized memory reads via sidechannel attacks. An attacker could use
this to expose sensitive information. (CVE-2018-15572)

It was discovered that an integer overflow vulnerability existed in the
Linux kernel when loading an executable to run. A local attacker could use
this to gain administrative privileges. (CVE-2018-14634)

It was discovered that a stack-based buffer overflow existed in the iSCSI
target implementation of the Linux kernel. A remote attacker could use this
to cause a denial of service (system crash). (CVE-2018-14633)

It was discovered that a memory leak existed in the IRDA subsystem of the
Linux kernel. A local attacker could use this to cause a denial of service
(kernel memory exhaustion). (CVE-2018-6554)

It was discovered that a use-after-free vulnerability existed in the IRDA
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-2018-6555)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-3.13.0-160-generic 3.13.0-160.210
linux-image-3.13.0-160-generic-lpae 3.13.0-160.210
linux-image-3.13.0-160-lowlatency 3.13.0-160.210
linux-image-3.13.0-160-powerpc-e500 3.13.0-160.210
linux-image-3.13.0-160-powerpc-e500mc 3.13.0-160.210
linux-image-3.13.0-160-powerpc-smp 3.13.0-160.210
linux-image-3.13.0-160-powerpc64-emb 3.13.0-160.210
linux-image-3.13.0-160-powerpc64-smp 3.13.0-160.210
linux-image-generic 3.13.0.160.170
linux-image-generic-lpae 3.13.0.160.170
linux-image-lowlatency 3.13.0.160.170
linux-image-powerpc-e500 3.13.0.160.170
linux-image-powerpc-e500mc 3.13.0.160.170
linux-image-powerpc-smp 3.13.0.160.170
linux-image-powerpc64-emb 3.13.0.160.170
linux-image-powerpc64-smp 3.13.0.160.170

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-3775-1
CVE-2018-14633, CVE-2018-14634, CVE-2018-15572, CVE-2018-15594,
CVE-2018-6554, CVE-2018-6555

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.13.0-160.210

USN-3775-2: Linux kernel (Trusty HWE) vulnerabilities

=========================================================================Ubuntu Security Notice USN-3775-2
October 01, 2018

linux-lts-trusty vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM

Details:

USN-3775-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu
12.04 ESM.

It was discovered that the paravirtualization implementation in the Linux
kernel did not properly handle some indirect calls, reducing the
effectiveness of Spectre v2 mitigations for paravirtual guests. A local
attacker could use this to expose sensitive information. (CVE-2018-15594)

It was discovered that microprocessors utilizing speculative execution and
prediction of return addresses via Return Stack Buffer (RSB) may allow
unauthorized memory reads via sidechannel attacks. An attacker could use
this to expose sensitive information. (CVE-2018-15572)

It was discovered that an integer overflow vulnerability existed in the
Linux kernel when loading an executable to run. A local attacker could use
this to gain administrative privileges. (CVE-2018-14634)

It was discovered that a stack-based buffer overflow existed in the iSCSI
target implementation of the Linux kernel. A remote attacker could use this
to cause a denial of service (system crash). (CVE-2018-14633)

It was discovered that a memory leak existed in the IRDA subsystem of the
Linux kernel. A local attacker could use this to cause a denial of service
(kernel memory exhaustion). (CVE-2018-6554)

It was discovered that a use-after-free vulnerability existed in the IRDA
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-2018-6555)

Update instructions:

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

Ubuntu 12.04 ESM:
linux-image-3.13.0-160-generic 3.13.0-160.210~precise1
linux-image-3.13.0-160-generic-lpae 3.13.0-160.210~precise1
linux-image-generic-lpae-lts-trusty 3.13.0.160.150
linux-image-generic-lts-trusty 3.13.0.160.150

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-3775-2
https://usn.ubuntu.com/usn/usn-3775-1
CVE-2018-14633, CVE-2018-14634, CVE-2018-15572, CVE-2018-15594,
CVE-2018-6554, CVE-2018-6555

USN-3776-1: Linux kernel vulnerabilities

=========================================================================
Ubuntu Security Notice USN-3776-1
October 01, 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:

Jann Horn discovered that the vmacache subsystem did not properly handle
sequence number overflows, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or execute arbitrary code. (CVE-2018-17182)

It was discovered that the paravirtualization implementation in the Linux
kernel did not properly handle some indirect calls, reducing the
effectiveness of Spectre v2 mitigations for paravirtual guests. A local
attacker could use this to expose sensitive information. (CVE-2018-15594)

It was discovered that microprocessors utilizing speculative execution and
prediction of return addresses via Return Stack Buffer (RSB) may allow
unauthorized memory reads via sidechannel attacks. An attacker could use
this to expose sensitive information. (CVE-2018-15572)

It was discovered that a NULL pointer dereference could be triggered in the
OCFS2 file system implementation in the Linux kernel. A local attacker
could use this to cause a denial of service (system crash).
(CVE-2017-18216)

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 a stack-based buffer overflow existed in the iSCSI
target implementation of the Linux kernel. A remote attacker could use this
to cause a denial of service (system crash). (CVE-2018-14633)

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 a memory leak existed in the IRDA subsystem of the
Linux kernel. A local attacker could use this to cause a denial of service
(kernel memory exhaustion). (CVE-2018-6554)

It was discovered that a use-after-free vulnerability existed in the IRDA
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-2018-6555)

Update instructions:

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

Ubuntu 16.04 LTS:
linux-image-4.4.0-1035-kvm 4.4.0-1035.41
linux-image-4.4.0-1069-aws 4.4.0-1069.79
linux-image-4.4.0-1098-raspi2 4.4.0-1098.106
linux-image-4.4.0-1102-snapdragon 4.4.0-1102.107
linux-image-4.4.0-137-generic 4.4.0-137.163
linux-image-4.4.0-137-generic-lpae 4.4.0-137.163
linux-image-4.4.0-137-lowlatency 4.4.0-137.163
linux-image-4.4.0-137-powerpc-e500mc 4.4.0-137.163
linux-image-4.4.0-137-powerpc-smp 4.4.0-137.163
linux-image-4.4.0-137-powerpc64-emb 4.4.0-137.163
linux-image-4.4.0-137-powerpc64-smp 4.4.0-137.163
linux-image-aws 4.4.0.1069.71
linux-image-generic 4.4.0.137.143
linux-image-generic-lpae 4.4.0.137.143
linux-image-kvm 4.4.0.1035.34
linux-image-lowlatency 4.4.0.137.143
linux-image-powerpc-e500mc 4.4.0.137.143
linux-image-powerpc-smp 4.4.0.137.143
linux-image-powerpc64-emb 4.4.0.137.143
linux-image-powerpc64-smp 4.4.0.137.143
linux-image-raspi2 4.4.0.1098.98
linux-image-snapdragon 4.4.0.1102.94

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-3776-1
CVE-2017-18216, CVE-2018-10902, CVE-2018-14633, CVE-2018-15572,
CVE-2018-15594, CVE-2018-16276, CVE-2018-17182, CVE-2018-6554,
CVE-2018-6555

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-137.163
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1069.79
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1035.41
https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1098.106
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1102.107

USN-3776-2: Linux kernel (Xenial HWE) vulnerabilities

=========================================================================
Ubuntu Security Notice USN-3776-2
October 01, 2018

linux-lts-xenial, linux-aws 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-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

USN-3776-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
14.04 LTS.

Jann Horn discovered that the vmacache subsystem did not properly handle
sequence number overflows, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or execute arbitrary code. (CVE-2018-17182)

It was discovered that the paravirtualization implementation in the Linux
kernel did not properly handle some indirect calls, reducing the
effectiveness of Spectre v2 mitigations for paravirtual guests. A local
attacker could use this to expose sensitive information. (CVE-2018-15594)

It was discovered that microprocessors utilizing speculative execution and
prediction of return addresses via Return Stack Buffer (RSB) may allow
unauthorized memory reads via sidechannel attacks. An attacker could use
this to expose sensitive information. (CVE-2018-15572)

It was discovered that a NULL pointer dereference could be triggered in the
OCFS2 file system implementation in the Linux kernel. A local attacker
could use this to cause a denial of service (system crash).
(CVE-2017-18216)

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 a stack-based buffer overflow existed in the iSCSI
target implementation of the Linux kernel. A remote attacker could use this
to cause a denial of service (system crash). (CVE-2018-14633)

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 a memory leak existed in the IRDA subsystem of the
Linux kernel. A local attacker could use this to cause a denial of service
(kernel memory exhaustion). (CVE-2018-6554)

It was discovered that a use-after-free vulnerability existed in the IRDA
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-2018-6555)

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-4.4.0-1031-aws 4.4.0-1031.34
linux-image-4.4.0-137-generic 4.4.0-137.163~14.04.1
linux-image-4.4.0-137-generic-lpae 4.4.0-137.163~14.04.1
linux-image-4.4.0-137-lowlatency 4.4.0-137.163~14.04.1
linux-image-4.4.0-137-powerpc-e500mc 4.4.0-137.163~14.04.1
linux-image-4.4.0-137-powerpc-smp 4.4.0-137.163~14.04.1
linux-image-4.4.0-137-powerpc64-emb 4.4.0-137.163~14.04.1
linux-image-4.4.0-137-powerpc64-smp 4.4.0-137.163~14.04.1
linux-image-aws 4.4.0.1031.31
linux-image-generic-lpae-lts-xenial 4.4.0.137.117
linux-image-generic-lts-xenial 4.4.0.137.117
linux-image-lowlatency-lts-xenial 4.4.0.137.117
linux-image-powerpc-e500mc-lts-xenial 4.4.0.137.117
linux-image-powerpc-smp-lts-xenial 4.4.0.137.117
linux-image-powerpc64-emb-lts-xenial 4.4.0.137.117
linux-image-powerpc64-smp-lts-xenial 4.4.0.137.117

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-3776-2
https://usn.ubuntu.com/usn/usn-3776-1
CVE-2017-18216, CVE-2018-10902, CVE-2018-14633, CVE-2018-15572,
CVE-2018-15594, CVE-2018-16276, CVE-2018-17182, CVE-2018-6554,
CVE-2018-6555

Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1031.34
https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-137.163~14.04.1

USN-3777-1: Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3777-1
October 01, 2018

linux, linux-aws, 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-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:

Jann Horn discovered that the vmacache subsystem did not properly handle
sequence number overflows, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or execute arbitrary code. (CVE-2018-17182)

It was discovered that the paravirtualization implementation in the Linux
kernel did not properly handle some indirect calls, reducing the
effectiveness of Spectre v2 mitigations for paravirtual guests. A local
attacker could use this to expose sensitive information. (CVE-2018-15594)

It was discovered that microprocessors utilizing speculative execution and
prediction of return addresses via Return Stack Buffer (RSB) may allow
unauthorized memory reads via sidechannel attacks. An attacker could use
this to expose sensitive information. (CVE-2018-15572)

Andy Lutomirski and Mika Penttilä discovered that the KVM implementation
in the Linux kernel did not properly check privilege levels when emulating
some instructions. An unprivileged attacker in a guest VM could use this to
escalate privileges within the guest. (CVE-2018-10853)

It was discovered that a stack-based buffer overflow existed in the iSCSI
target implementation of the Linux kernel. A remote attacker could use this
to cause a denial of service (system crash). (CVE-2018-14633)

It was discovered that a memory leak existed in the IRDA subsystem of the
Linux kernel. A local attacker could use this to cause a denial of service
(kernel memory exhaustion). (CVE-2018-6554)

It was discovered that a use-after-free vulnerability existed in the IRDA
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-2018-6555)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1021-gcp 4.15.0-1021.22
linux-image-4.15.0-1021-oem 4.15.0-1021.24
linux-image-4.15.0-1023-aws 4.15.0-1023.23
linux-image-4.15.0-1023-kvm 4.15.0-1023.23
linux-image-4.15.0-1024-raspi2 4.15.0-1024.26
linux-image-4.15.0-36-generic 4.15.0-36.39
linux-image-4.15.0-36-generic-lpae 4.15.0-36.39
linux-image-4.15.0-36-lowlatency 4.15.0-36.39
linux-image-4.15.0-36-snapdragon 4.15.0-36.39
linux-image-aws 4.15.0.1023.23
linux-image-gcp 4.15.0.1021.23
linux-image-generic 4.15.0.36.38
linux-image-generic-lpae 4.15.0.36.38
linux-image-gke 4.15.0.1021.23
linux-image-kvm 4.15.0.1023.23
linux-image-lowlatency 4.15.0.36.38
linux-image-oem 4.15.0.1021.23
linux-image-raspi2 4.15.0.1024.22
linux-image-snapdragon 4.15.0.36.38

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-3777-1
CVE-2018-10853, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594,
CVE-2018-17182, CVE-2018-6554, CVE-2018-6555

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-36.39
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1023.23
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1021.22
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1023.23
https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1021.24
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1024.26

USN-3777-2: Linux kernel (HWE) vulnerabilities

==========================================================================
Ubuntu Security Notice USN-3777-2
October 01, 2018

linux-hwe, linux-gcp 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-3777-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
LTS. This update provides the corresponding updates for the Linux
Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu
16.04 LTS.

Jann Horn discovered that the vmacache subsystem did not properly handle
sequence number overflows, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or execute arbitrary code. (CVE-2018-17182)

It was discovered that the paravirtualization implementation in the Linux
kernel did not properly handle some indirect calls, reducing the
effectiveness of Spectre v2 mitigations for paravirtual guests. A local
attacker could use this to expose sensitive information. (CVE-2018-15594)

It was discovered that microprocessors utilizing speculative execution and
prediction of return addresses via Return Stack Buffer (RSB) may allow
unauthorized memory reads via sidechannel attacks. An attacker could use
this to expose sensitive information. (CVE-2018-15572)

Andy Lutomirski and Mika Penttilä discovered that the KVM implementation
in the Linux kernel did not properly check privilege levels when emulating
some instructions. An unprivileged attacker in a guest VM could use this to
escalate privileges within the guest. (CVE-2018-10853)

It was discovered that a stack-based buffer overflow existed in the iSCSI
target implementation of the Linux kernel. A remote attacker could use this
to cause a denial of service (system crash). (CVE-2018-14633)

It was discovered that a memory leak existed in the IRDA subsystem of the
Linux kernel. A local attacker could use this to cause a denial of service
(kernel memory exhaustion). (CVE-2018-6554)

It was discovered that a use-after-free vulnerability existed in the IRDA
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-2018-6555)

Update instructions:

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

Ubuntu 16.04 LTS:
linux-image-4.15.0-1021-gcp 4.15.0-1021.22~16.04.1
linux-image-4.15.0-36-generic 4.15.0-36.39~16.04.1
linux-image-4.15.0-36-generic-lpae 4.15.0-36.39~16.04.1
linux-image-4.15.0-36-lowlatency 4.15.0-36.39~16.04.1
linux-image-gcp 4.15.0.1021.35
linux-image-generic-hwe-16.04 4.15.0.36.59
linux-image-generic-lpae-hwe-16.04 4.15.0.36.59
linux-image-gke 4.15.0.1021.35
linux-image-lowlatency-hwe-16.04 4.15.0.36.59
linux-image-oem 4.15.0.36.59

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-3777-2
https://usn.ubuntu.com/usn/usn-3777-1
CVE-2018-10853, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594,
CVE-2018-17182, CVE-2018-6554, CVE-2018-6555

Package Information:
https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1021.22~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-36.39~16.04.1