USN-4162-1: Linux kernel vulnerabilities

22 October 2019

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

It was discovered that the RSI 91x Wi-Fi driver in the Linux kernel did not did not handle detach operations correctly, leading to a use-after-free vulnerability. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-21008)

Wen Huang discovered that the Marvell Wi-Fi device driver in the Linux kernel did not properly perform bounds checking, leading to a heap overflow. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-14814, CVE-2019-14815, CVE-2019-14816)

Matt Delco discovered that the KVM hypervisor implementation in the Linux kernel did not properly perform bounds checking when handling coalesced MMIO write operations. A local attacker with write access to /dev/kvm could use this to cause a denial of service (system crash). (CVE-2019-14821)

Hui Peng and Mathias Payer discovered that the USB audio driver for the Linux kernel did not properly validate device meta data. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2019-15117)

Hui Peng and Mathias Payer discovered that the USB audio driver for the Linux kernel improperly performed recursion while handling device meta data. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2019-15118)

It was discovered that the Technisat DVB-S/S2 USB device driver in the Linux kernel contained a buffer overread. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information. (CVE-2019-15505)

Brad Spengler discovered that a Spectre mitigation was improperly implemented in the ptrace susbsystem of the Linux kernel. A local attacker could possibly use this to expose sensitive information. (CVE-2019-15902)

It was discovered that the SMB networking file system implementation in the Linux kernel contained a buffer overread. An attacker could use this to expose sensitive information (kernel memory). (CVE-2019-15918)

Update instructions

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

Ubuntu 18.04 LTS
linux-image-4.15.0-1027-oracle - 4.15.0-1027.30
linux-image-4.15.0-1046-gke - 4.15.0-1046.49
linux-image-4.15.0-1048-kvm - 4.15.0-1048.48
linux-image-4.15.0-1049-raspi2 - 4.15.0-1049.53
linux-image-4.15.0-1052-aws - 4.15.0-1052.54
linux-image-4.15.0-1059-oem - 4.15.0-1059.68
linux-image-4.15.0-1066-snapdragon - 4.15.0-1066.73
linux-image-4.15.0-66-generic - 4.15.0-66.75
linux-image-4.15.0-66-generic-lpae - 4.15.0-66.75
linux-image-4.15.0-66-lowlatency - 4.15.0-66.75
linux-image-aws - 4.15.0.1052.51
linux-image-generic - 4.15.0.66.68
linux-image-generic-lpae - 4.15.0.66.68
linux-image-gke - 4.15.0.1046.49
linux-image-gke-4.15 - 4.15.0.1046.49
linux-image-kvm - 4.15.0.1048.48
linux-image-lowlatency - 4.15.0.66.68
linux-image-oem - 4.15.0.1059.63
linux-image-oracle - 4.15.0.1027.30
linux-image-powerpc-e500mc - 4.15.0.66.68
linux-image-powerpc-smp - 4.15.0.66.68
linux-image-powerpc64-emb - 4.15.0.66.68
linux-image-powerpc64-smp - 4.15.0.66.68
linux-image-raspi2 - 4.15.0.1049.47
linux-image-snapdragon - 4.15.0.1066.69
linux-image-virtual - 4.15.0.66.68
Ubuntu 16.04 LTS
linux-image-4.15.0-1027-oracle - 4.15.0-1027.30~16.04.1
linux-image-4.15.0-1047-gcp - 4.15.0-1047.50
linux-image-4.15.0-1052-aws - 4.15.0-1052.54~16.04.1
linux-image-4.15.0-1061-azure - 4.15.0-1061.66
linux-image-4.15.0-66-generic - 4.15.0-66.75~16.04.1
linux-image-4.15.0-66-generic-lpae - 4.15.0-66.75~16.04.1
linux-image-4.15.0-66-lowlatency - 4.15.0-66.75~16.04.1
linux-image-aws-hwe - 4.15.0.1052.52
linux-image-azure - 4.15.0.1061.64
linux-image-gcp - 4.15.0.1047.61
linux-image-generic-hwe-16.04 - 4.15.0.66.86
linux-image-generic-lpae-hwe-16.04 - 4.15.0.66.86
linux-image-gke - 4.15.0.1047.61
linux-image-lowlatency-hwe-16.04 - 4.15.0.66.86
linux-image-oem - 4.15.0.66.86
linux-image-oracle - 4.15.0.1027.20
linux-image-virtual-hwe-16.04 - 4.15.0.66.86

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