USN-3762-1: Linux kernel vulnerabilities

Releases

• Ubuntu 18.04 ESM

Packages

• 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-raspi2 - Linux kernel for Raspberry Pi 2

Details

It was discovered that the VirtIO subsystem in the Linux kernel did not
properly initialize memory in some situations. A local attacker could use
this to possibly expose sensitive information (kernel memory).
(CVE-2018-1118)

Seunghun Han discovered an information leak in the ACPI handling code in
the Linux kernel when handling early termination of ACPI table loading. A
local attacker could use this to expose sensitive informal (kernel address
locations). (CVE-2017-13695)

Update instructions

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

Ubuntu 18.04

• linux-image-4.15.0-1021-aws - 4.15.0-1021.21
• linux-image-4.15.0-1021-kvm - 4.15.0-1021.21
• linux-image-4.15.0-1022-raspi2 - 4.15.0-1022.24
• linux-image-4.15.0-34-generic - 4.15.0-34.37
• linux-image-4.15.0-34-generic-lpae - 4.15.0-34.37
• linux-image-4.15.0-34-lowlatency - 4.15.0-34.37
• linux-image-4.15.0-34-snapdragon - 4.15.0-34.37

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

• CVE-2017-13695
• CVE-2018-1118

Related notices

• USN-3762-2
• USN-3696-2
• USN-3696-1