USN-4302-1: Linux kernel vulnerabilities

25 March 2020

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

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

  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 ESM

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-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
  • 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-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-4.15.0-1035-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-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-4.15.0-1035-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
Ubuntu 14.04 ESM
linux-image-4.15.0-1074-azure - 4.15.0-1074.79~14.04.1
linux-image-azure - 4.15.0.1074.60

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