USN-4302-1: Linux kernel vulnerabilities

linux, linux-aws, linux-aws-hwe, linux-gcp, linux-gke-4.15, linux-hwe, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities

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

Ubuntu 18.04 LTS
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-gke-4.15 – Linux kernel for Google Container Engine (GKE) systems
linux-kvm – Linux kernel for cloud environments
linux-raspi2 – Linux kernel for Raspberry Pi 2
linux-snapdragon – Linux kernel for Snapdragon processors
linux-aws-hwe – Linux kernel for Amazon Web Services (AWS-HWE) systems
linux-gcp – Linux kernel for Google Cloud Platform (GCP) systems
linux-hwe – Linux hardware enablement (HWE) kernel

Details

Paulo Bonzini discovered that the KVM hypervisor implementation in the
Linux kernel could improperly let a nested (level 2) guest access the
resources of a parent (level 1) guest in certain situations. An attacker
could use this to expose sensitive information. (CVE-2020-2732)

Gregory Herrero discovered that the fix for CVE-2019-14615 to address the
Linux kernel not properly clearing data structures on context switches for
certain Intel graphics processors was incomplete. A local attacker could
use this to expose sensitive information. (CVE-2020-8832)

It was discovered that the IPMI message handler implementation in the Linux
kernel did not properly deallocate memory in certain situations. A local
attacker could use this to cause a denial of service (kernel memory
exhaustion). (CVE-2019-19046)

It was discovered that the Intel WiMAX 2400 driver in the Linux kernel did
not properly deallocate memory in certain situations. A local attacker
could use this to cause a denial of service (kernel memory exhaustion).
(CVE-2019-19051)

It was discovered that the Marvell Wi-Fi device driver in the Linux kernel
did not properly deallocate memory in certain error conditions. A local
attacker could use this to possibly cause a denial of service (kernel
memory exhaustion). (CVE-2019-19056)

It was discovered that the Intel® Wi-Fi device driver in the Linux kernel
device driver in the Linux kernel did not properly deallocate memory in
certain error conditions. A local attacker could possibly use this to cause
a denial of service (kernel memory exhaustion). (CVE-2019-19058)

It was discovered that the Brocade BFA Fibre Channel device driver in the
Linux kernel did not properly deallocate memory in certain error
conditions. A local attacker could possibly use this to cause a denial of
service (kernel memory exhaustion). (CVE-2019-19066)

It was discovered that the Realtek RTL8xxx USB Wi-Fi device driver in the
Linux kernel did not properly deallocate memory in certain error
conditions. A local attacker could possibly use this to cause a denial of
service (kernel memory exhaustion). (CVE-2019-19068)

It was discovered that ZR364XX Camera USB device driver for the Linux
kernel did not properly initialize memory. A physically proximate attacker
could use this to cause a denial of service (system crash).
(CVE-2019-15217)

Update instructions

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

Ubuntu 18.04 LTS: linux-image-4.15.0-1055-gke – 4.15.0-1055.58; linux-image-4.15.0-1056-kvm – 4.15.0-1056.57; linux-image-4.15.0-1057-raspi2 – 4.15.0-1057.61; linux-image-4.15.0-1063-aws – 4.15.0-1063.67; linux-image-4.15.0-1074-snapdragon – 4.15.0-1074.81; linux-image-4.15.0-91-generic – 4.15.0-91.92; linux-image-4.15.0-91-generic-lpae – 4.15.0-91.92; linux-image-4.15.0-91-lowlatency – 4.15.0-91.92; linux-image-aws – 4.15.0.1063.64; linux-image-aws-lts-18.04 – 4.15.0.1063.64; linux-image-generic – 4.15.0.91.83; linux-image-generic-lpae – 4.15.0.91.83; linux-image-gke – 4.15.0.1055.59; linux-image-gke-4.15 – 4.15.0.1055.59; linux-image-kvm – 4.15.0.1056.56; linux-image-lowlatency – 4.15.0.91.83; linux-image-powerpc-e500mc – 4.15.0.91.83; linux-image-powerpc-smp – 4.15.0.91.83; linux-image-powerpc64-emb – 4.15.0.91.83; linux-image-powerpc64-smp – 4.15.0.91.83; linux-image-raspi2 – 4.15.0.1057.55; linux-image-snapdragon – 4.15.0.1074.77; linux-image-virtual – 4.15.0.91.83
Ubuntu 16.04 LTS: linux-image-4.15.0-1058-gcp – 4.15.0-1058.62; linux-image-4.15.0-1063-aws – 4.15.0-1063.67~16.04.1; linux-image-4.15.0-91-generic – 4.15.0-91.92~16.04.1; linux-image-4.15.0-91-generic-lpae – 4.15.0-91.92~16.04.1; linux-image-4.15.0-91-lowlatency – 4.15.0-91.92~16.04.1; linux-image-aws-hwe – 4.15.0.1063.63; linux-image-gcp – 4.15.0.1058.72; linux-image-generic-hwe-16.04 – 4.15.0.91.101; linux-image-generic-lpae-hwe-16.04 – 4.15.0.91.101; linux-image-gke – 4.15.0.1058.72; linux-image-lowlatency-hwe-16.04 – 4.15.0.91.101; linux-image-oem – 4.15.0.91.101; linux-image-virtual-hwe-16.04 – 4.15.0.91.101

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.

References

Source: USN-4302-1: Linux kernel vulnerabilities

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