ESB-2018.2958 - [Ubuntu] kernel: Multiple vulnerabilities 2018-10-02

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===========================================================================
             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.2958
          Multiple kernel vulnerabilities have been identified in
                       various Ubuntu distributions
                              2 October 2018

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           kernel
Publisher:         Ubuntu
Operating System:  Ubuntu
Impact/Access:     Root Compromise        -- Existing Account      
                   Access Privileged Data -- Existing Account      
                   Denial of Service      -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-15594 CVE-2018-15572 CVE-2018-14634
                   CVE-2018-14633 CVE-2018-6555 CVE-2018-6554

Reference:         ESB-2018.2955
                   ESB-2018.2930
                   ESB-2018.2914
                   ESB-2018.2885
                   ESB-2018.2831

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3775-1
   http://www.ubuntu.com/usn/usn-3775-2
   http://www.ubuntu.com/usn/usn-3776-1
   http://www.ubuntu.com/usn/usn-3776-2
   http://www.ubuntu.com/usn/usn-3777-1
   http://www.ubuntu.com/usn/usn-3777-2

Comment: This bulletin contains six (6) Ubuntu security advisories.

- --------------------------BEGIN INCLUDED TEXT--------------------

==========================================================================
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

==========================================================================
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

==========================================================================
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

==========================================================================
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

==========================================================================
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

==========================================================================
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

- --------------------------END INCLUDED TEXT--------------------

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