USN-3820-1: Linux kernel vulnerabilities
linux, linux-aws, linux-azure, 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-azure – Linux kernel for Microsoft Azure Cloud 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
Felix Wilhelm discovered that the Xen netback driver in the Linux kernel
did not properly perform input validation in some situations. An attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2018-15471)
It was discovered that the generic SCSI driver in the Linux kernel did not
properly enforce permissions on kernel memory access. A local attacker
could use this to expose sensitive information or possibly elevate
privileges. (CVE-2017-13168)
It was discovered that an integer overflow existed in the CD-ROM driver of
the Linux kernel. A local attacker could use this to expose sensitive
information (kernel memory). (CVE-2018-16658)
It was discovered that an integer overflow existed in the HID Bluetooth
implementation in the Linux kernel that could lead to a buffer overwrite.
An attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2018-9363)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 18.04 LTS
- linux-image-4.15.0-1024-gcp – 4.15.0-1024.25
- linux-image-4.15.0-1026-kvm – 4.15.0-1026.26
- linux-image-4.15.0-1026-oem – 4.15.0-1026.31
- linux-image-4.15.0-1027-aws – 4.15.0-1027.27
- linux-image-4.15.0-1028-raspi2 – 4.15.0-1028.30
- linux-image-4.15.0-1031-azure – 4.15.0-1031.32
- linux-image-4.15.0-39-generic – 4.15.0-39.42
- linux-image-4.15.0-39-generic-lpae – 4.15.0-39.42
- linux-image-4.15.0-39-lowlatency – 4.15.0-39.42
- linux-image-4.15.0-39-snapdragon – 4.15.0-39.42
- linux-image-aws – 4.15.0.1027.27
- linux-image-azure – 4.15.0.1031.31
- linux-image-gcp – 4.15.0.1024.26
- linux-image-generic – 4.15.0.39.41
- linux-image-generic-lpae – 4.15.0.39.41
- linux-image-gke – 4.15.0.1024.26
- linux-image-kvm – 4.15.0.1026.26
- linux-image-lowlatency – 4.15.0.39.41
- linux-image-oem – 4.15.0.1026.31
- linux-image-raspi2 – 4.15.0.1028.26
- linux-image-snapdragon – 4.15.0.39.41
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
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.
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