1. Ubuntu Security Notices
  2. USN-4302-1

USN-4302-1: Linux kernel vulnerabilities

Publication date

25 March 2020

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-aws-hwe - Linux kernel for Amazon Web Services (AWS-HWE) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gke-4.15 - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oem - Linux kernel for OEM processors
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon processors

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). (

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(R) 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

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

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
18.04 bionic linux-image-4.15.0-1035-oracle –  4.15.0-1035.39
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-4.15.0-1076-oem –  4.15.0-1076.86
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-oem –  4.15.0.1076.80
linux-image-oracle-lts-18.04 –  4.15.0.1035.43
linux-image-raspi2 –  4.15.0.1057.55
linux-image-snapdragon –  4.15.0.1074.77
linux-image-virtual –  4.15.0.91.83
16.04 xenial linux-image-4.15.0-1035-oracle –  4.15.0-1035.38~16.04.1
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-4.15.0-1075-azure –  4.15.0-1075.80
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-azure –  4.15.0.1075.78
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-oracle –  4.15.0.1035.28
linux-image-virtual-hwe-16.04 –  4.15.0.91.101
14.04 trusty linux-image-4.15.0-1074-azure –  4.15.0-1074.79~14.04.1
linux-image-azure –  4.15.0.1074.60

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References

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