USN-4163-1: Linux kernel vulnerabilities

22 October 2019

linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities

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

  • 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-kvm - Linux kernel for cloud environments
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon processors

Details

It was discovered that a race condition existed in the ARC EMAC ethernet driver for the Linux kernel, resulting in a use-after-free vulnerability. An attacker could use this to cause a denial of service (system crash). (CVE-2016-10906)

It was discovered that a race condition existed in the Serial Attached SCSI (SAS) implementation in the Linux kernel when handling certain error conditions. A local attacker could use this to cause a denial of service (kernel deadlock). (CVE-2017-18232)

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-2019-14816)

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)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-4.4.0-1060-kvm - 4.4.0-1060.67
linux-image-4.4.0-1096-aws - 4.4.0-1096.107
linux-image-4.4.0-1124-raspi2 - 4.4.0-1124.133
linux-image-4.4.0-1128-snapdragon - 4.4.0-1128.136
linux-image-4.4.0-166-generic - 4.4.0-166.195
linux-image-4.4.0-166-generic-lpae - 4.4.0-166.195
linux-image-4.4.0-166-lowlatency - 4.4.0-166.195
linux-image-4.4.0-166-powerpc-e500mc - 4.4.0-166.195
linux-image-4.4.0-166-powerpc-smp - 4.4.0-166.195
linux-image-4.4.0-166-powerpc64-emb - 4.4.0-166.195
linux-image-4.4.0-166-powerpc64-smp - 4.4.0-166.195
linux-image-aws - 4.4.0.1096.100
linux-image-generic - 4.4.0.166.174
linux-image-generic-lpae - 4.4.0.166.174
linux-image-kvm - 4.4.0.1060.60
linux-image-lowlatency - 4.4.0.166.174
linux-image-powerpc-e500mc - 4.4.0.166.174
linux-image-powerpc-smp - 4.4.0.166.174
linux-image-powerpc64-emb - 4.4.0.166.174
linux-image-powerpc64-smp - 4.4.0.166.174
linux-image-raspi2 - 4.4.0.1124.124
linux-image-snapdragon - 4.4.0.1128.120
linux-image-virtual - 4.4.0.166.174

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