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Ubuntu Security Notice USN-3741-1
August 14, 2018
linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities
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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 memory present in the L1 data cache of an Intel CPU
core may be exposed to a malicious process that is executing on the CPU
core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
attacker in a guest virtual machine could use this to expose sensitive
information (memory from other guests or the host OS). (CVE-2018-3646)
It was discovered that memory present in the L1 data cache of an Intel CPU
core may be exposed to a malicious process that is executing on the CPU
core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
attacker could use this to expose sensitive information (memory from the
kernel or other processes). (CVE-2018-3620)
Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel
performed algorithmically expensive operations in some situations when
handling incoming packets. A remote attacker could use this to cause a
denial of service. (CVE-2018-5390)
Juha-Matti Tilli discovered that the IP implementation in the Linux kernel
performed algorithmically expensive operations in some situations when
handling incoming packet fragments. A remote attacker could use this to
cause a denial of service. (CVE-2018-5391)
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 LTS:
linux-image-4.4.0-1031-kvm 4.4.0-1031.37
linux-image-4.4.0-1065-aws 4.4.0-1065.75
linux-image-4.4.0-1094-raspi2 4.4.0-1094.102
linux-image-4.4.0-1098-snapdragon 4.4.0-1098.103
linux-image-4.4.0-133-generic 4.4.0-133.159
linux-image-4.4.0-133-generic-lpae 4.4.0-133.159
linux-image-4.4.0-133-lowlatency 4.4.0-133.159
linux-image-4.4.0-133-powerpc-e500mc 4.4.0-133.159
linux-image-4.4.0-133-powerpc-smp 4.4.0-133.159
linux-image-4.4.0-133-powerpc64-emb 4.4.0-133.159
linux-image-4.4.0-133-powerpc64-smp 4.4.0-133.159
linux-image-aws 4.4.0.1065.67
linux-image-generic 4.4.0.133.139
linux-image-generic-lpae 4.4.0.133.139
linux-image-kvm 4.4.0.1031.30
linux-image-lowlatency 4.4.0.133.139
linux-image-powerpc-e500mc 4.4.0.133.139
linux-image-powerpc-smp 4.4.0.133.139
linux-image-powerpc64-emb 4.4.0.133.139
linux-image-powerpc64-smp 4.4.0.133.139
linux-image-raspi2 4.4.0.1094.94
linux-image-snapdragon 4.4.0.1098.90
Please note that the recommended mitigation for CVE-2018-3646 involves
updating processor microcode in addition to updating the kernel;
however, the kernel includes a fallback for processors that have not
received microcode updates.
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-3741-1
CVE-2018-3620, CVE-2018-3646, CVE-2018-5390, CVE-2018-5391,
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF
Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-133.159
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1065.75
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1031.37
https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1094.102
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1098.103
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