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==========================================================================
Ubuntu Security Notice USN-3580-1
February 22, 2018

linux 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: Linux kernel

Details:

Jann Horn discovered that microprocessors utilizing speculative execution
and branch prediction may allow unauthorized memory reads via sidechannel
attacks. This flaw is known as Spectre. A local attacker could use this to
expose sensitive information, including kernel memory.

Update instructions:

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

Ubuntu 12.04 ESM:
linux-image-3.2.0-133-generic 3.2.0-133.179
linux-image-3.2.0-133-generic-pae 3.2.0-133.179
linux-image-generic 3.2.0.133.148
linux-image-generic-pae 3.2.0.133.148

Please note that fully mitigating CVE-2017-5715 (Spectre Variant 2)
requires corresponding processor microcode/firmware updates or,
in virtual environments, hypervisor updates. On i386 and amd64
architectures, the IBRS and IBPB features are required to enable the
kernel mitigations. Ubuntu is working with Intel and AMD to provide
future microcode updates that implement IBRS and IBPB as they are made
available. Ubuntu users with a processor from a different vendor should
contact the vendor to identify necessary firmware updates. Ubuntu
will provide corresponding QEMU updates in the future for users of
self-hosted virtual environments in coordination with upstream QEMU.
Ubuntu users in cloud environments should contact the cloud provider
to confirm that the hypervisor has been updated to expose the new
CPU features to virtual machines.

After a standard system update you need to reboot your computer to
apply the necessary changes.

References:
https://www.ubuntu.com/usn/usn-3580-1
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/SpectreAndMeltdown
CVE-2017-5715, CVE-2017-5753

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==========================================================================
Ubuntu Security Notice USN-3581-1
February 22, 2018

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

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

– Ubuntu 17.10

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
– linux: Linux kernel

Details:

Mohamed Ghannam discovered that the IPv4 raw socket implementation in the
Linux kernel contained a race condition leading to uninitialized pointer
usage. A local attacker could use this to cause a denial of service or
possibly execute arbitrary code. (CVE-2017-17712)

ChunYu Wang discovered that a use-after-free vulnerability existed
in the SCTP protocol 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-2017-15115)

Mohamed Ghannam discovered a use-after-free vulnerability in the DCCP
protocol 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-2017-8824)

USN-3541-1 mitigated CVE-2017-5715 (Spectre Variant 2) for the
amd64 architecture in Ubuntu 17.10. This update provides the
compiler-based retpoline kernel mitigation for the amd64 and i386
architectures. Original advisory details:

Update instructions:

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

Ubuntu 17.10:
linux-image-4.13.0-36-generic 4.13.0-36.40
linux-image-4.13.0-36-generic-lpae 4.13.0-36.40
linux-image-4.13.0-36-lowlatency 4.13.0-36.40
linux-image-generic 4.13.0.36.38
linux-image-generic-lpae 4.13.0.36.38
linux-image-lowlatency 4.13.0.36.38

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-3581-1
CVE-2017-15115, CVE-2017-17712, CVE-2017-5715, CVE-2017-8824

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.13.0-36.40

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==========================================================================
Ubuntu Security Notice USN-3582-1
February 22, 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:

Laurent Guerby discovered that the mbcache feature in the ext2 and ext4
filesystems in the Linux kernel improperly handled xattr block caching. A
local attacker could use this to cause a denial of service. (CVE-2015-8952)

Vitaly Mayatskikh discovered that the SCSI subsystem in the Linux kernel
did not properly track reference counts when merging buffers. A local
attacker could use this to cause a denial of service (memory exhaustion).
(CVE-2017-12190)

ChunYu Wang discovered that a use-after-free vulnerability existed in the
SCTP protocol 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-2017-15115)

USN-3540-1 mitigated CVE-2017-5715 (Spectre Variant 2) for the
amd64 architecture in Ubuntu 16.04 LTS. This update provides the
compiler-based retpoline kernel mitigation for the amd64 and i386
architectures. Original advisory details:

Update instructions:

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

Ubuntu 16.04 LTS:
linux-image-4.4.0-1019-kvm 4.4.0-1019.24
linux-image-4.4.0-1052-aws 4.4.0-1052.61
linux-image-4.4.0-1085-raspi2 4.4.0-1085.93
linux-image-4.4.0-1087-snapdragon 4.4.0-1087.92
linux-image-4.4.0-116-generic 4.4.0-116.140
linux-image-4.4.0-116-generic-lpae 4.4.0-116.140
linux-image-4.4.0-116-lowlatency 4.4.0-116.140
linux-image-4.4.0-116-powerpc-e500mc 4.4.0-116.140
linux-image-4.4.0-116-powerpc-smp 4.4.0-116.140
linux-image-4.4.0-116-powerpc64-emb 4.4.0-116.140
linux-image-4.4.0-116-powerpc64-smp 4.4.0-116.140
linux-image-aws 4.4.0.1052.54
linux-image-generic 4.4.0.116.122
linux-image-generic-lpae 4.4.0.116.122
linux-image-kvm 4.4.0.1019.18
linux-image-lowlatency 4.4.0.116.122
linux-image-powerpc-e500mc 4.4.0.116.122
linux-image-powerpc-smp 4.4.0.116.122
linux-image-powerpc64-emb 4.4.0.116.122
linux-image-powerpc64-smp 4.4.0.116.122
linux-image-raspi2 4.4.0.1085.85
linux-image-snapdragon 4.4.0.1087.79

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3582-1
CVE-2015-8952, CVE-2017-12190, CVE-2017-15115, CVE-2017-17712,
CVE-2017-5715, CVE-2017-8824

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-116.140
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1052.61
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1019.24
https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1085.93
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1087.92

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==========================================================================
Ubuntu Security Notice USN-3581-2
February 22, 2018

linux-hwe, linux-azure, linux-gcp, linux-oem 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-azure: Linux kernel for Microsoft Azure Cloud systems
– linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
– linux-hwe: Linux hardware enablement (HWE) kernel
– linux-oem: Linux kernel for OEM processors

Details:

USN-3581-1 fixed vulnerabilities in the Linux kernel for Ubuntu 17.10.
This update provides the corresponding updates for the Linux Hardware
Enablement (HWE) kernel from Ubuntu 17.10 for Ubuntu 16.04 LTS.

USN-3541-2 mitigated CVE-2017-5715 (Spectre Variant 2) for the
amd64 architecture in Ubuntu 16.04 LTS. This update provides the
compiler-based retpoline kernel mitigation for the amd64 and i386
architectures. Original advisory details:

Update instructions:

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

Ubuntu 16.04 LTS:
linux-image-4.13.0-1011-azure 4.13.0-1011.14
linux-image-4.13.0-1011-gcp 4.13.0-1011.15
linux-image-4.13.0-1021-oem 4.13.0-1021.23
linux-image-4.13.0-36-generic 4.13.0-36.40~16.04.1
linux-image-4.13.0-36-generic-lpae 4.13.0-36.40~16.04.1
linux-image-4.13.0-36-lowlatency 4.13.0-36.40~16.04.1
linux-image-azure 4.13.0.1011.12
linux-image-gcp 4.13.0.1011.13
linux-image-generic-hwe-16.04 4.13.0.36.55
linux-image-generic-lpae-hwe-16.04 4.13.0.36.55
linux-image-gke 4.13.0.1011.13
linux-image-lowlatency-hwe-16.04 4.13.0.36.55
linux-image-oem 4.13.0.1021.25

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3581-2
https://usn.ubuntu.com/usn/usn-3581-1
CVE-2017-15115, CVE-2017-17712, CVE-2017-5715, CVE-2017-8824

Package Information:
https://launchpad.net/ubuntu/+source/linux-azure/4.13.0-1011.14
https://launchpad.net/ubuntu/+source/linux-gcp/4.13.0-1011.15
https://launchpad.net/ubuntu/+source/linux-hwe/4.13.0-36.40~16.04.1
https://launchpad.net/ubuntu/+source/linux-oem/4.13.0-1021.23

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==========================================================================
Ubuntu Security Notice USN-3582-2
February 22, 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-3582-1 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.

ChunYu Wang discovered that a use-after-free vulnerability existed in the
SCTP protocol 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-2017-15115)

USN-3540-2 mitigated CVE-2017-5715 (Spectre Variant 2) for the
amd64 architecture in Ubuntu 14.04 LTS. This update provides the
compiler-based retpoline kernel mitigation for the amd64 and i386
architectures. Original advisory details:

Update instructions:

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

Ubuntu 14.04 LTS:
linux-image-4.4.0-1014-aws 4.4.0-1014.14
linux-image-4.4.0-116-generic 4.4.0-116.140~14.04.1
linux-image-4.4.0-116-generic-lpae 4.4.0-116.140~14.04.1
linux-image-4.4.0-116-lowlatency 4.4.0-116.140~14.04.1
linux-image-4.4.0-116-powerpc-e500mc 4.4.0-116.140~14.04.1
linux-image-4.4.0-116-powerpc-smp 4.4.0-116.140~14.04.1
linux-image-4.4.0-116-powerpc64-emb 4.4.0-116.140~14.04.1
linux-image-4.4.0-116-powerpc64-smp 4.4.0-116.140~14.04.1
linux-image-aws 4.4.0.1014.14
linux-image-generic-lpae-lts-xenial 4.4.0.116.98
linux-image-generic-lts-xenial 4.4.0.116.98
linux-image-lowlatency-lts-xenial 4.4.0.116.98
linux-image-powerpc-e500mc-lts-xenial 4.4.0.116.98
linux-image-powerpc-smp-lts-xenial 4.4.0.116.98
linux-image-powerpc64-emb-lts-xenial 4.4.0.116.98
linux-image-powerpc64-smp-lts-xenial 4.4.0.116.98

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3582-2
https://usn.ubuntu.com/usn/usn-3582-1
CVE-2015-8952, CVE-2017-12190, CVE-2017-15115, CVE-2017-17712,
CVE-2017-5715, CVE-2017-8824

Package Information:
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1014.14
https://launchpad.net/ubuntu/+source/linux-lts-xenial/4.4.0-116.140~14.04.1

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