USN-3631-1: Linux kernel vulnerabilities

24 April 2018

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 buffer overread vulnerability existed in the keyring subsystem of the Linux kernel. A local attacker could possibly use this to expose sensitive information (kernel memory). (CVE-2017-13305)

It was discovered that the DM04/QQBOX USB driver in the Linux kernel did not properly handle device attachment and warm-start. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16538)

Luo Quan and Wei Yang discovered that a race condition existed in the Advanced Linux Sound Architecture (ALSA) subsystem of the Linux kernel when handling ioctl()s. A local attacker could use this to cause a denial of service (system deadlock). (CVE-2018-1000004)

Wang Qize discovered that an information disclosure vulnerability existed in the SMBus driver for ACPI Embedded Controllers in the Linux kernel. A local attacker could use this to expose sensitive information (kernel pointer addresses). (CVE-2018-5750)

范龙飞 discovered that a race condition existed in the Advanced Linux Sound Architecture (ALSA) subsystem of the Linux kernel that could lead to a use-after-free or an out-of-bounds buffer access. A local attacker with access to /dev/snd/seq could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-7566)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-4.4.0-1021-kvm - 4.4.0-1021.26
linux-image-4.4.0-1055-aws - 4.4.0-1055.64
linux-image-4.4.0-1087-raspi2 - 4.4.0-1087.95
linux-image-4.4.0-1090-snapdragon - 4.4.0-1090.95
linux-image-4.4.0-121-generic - 4.4.0-121.145
linux-image-4.4.0-121-generic-lpae - 4.4.0-121.145
linux-image-4.4.0-121-lowlatency - 4.4.0-121.145
linux-image-4.4.0-121-powerpc-e500mc - 4.4.0-121.145
linux-image-4.4.0-121-powerpc-smp - 4.4.0-121.145
linux-image-4.4.0-121-powerpc64-emb - 4.4.0-121.145
linux-image-4.4.0-121-powerpc64-smp - 4.4.0-121.145
linux-image-aws - 4.4.0.1055.57
linux-image-generic - 4.4.0.121.127
linux-image-generic-lpae - 4.4.0.121.127
linux-image-kvm - 4.4.0.1021.20
linux-image-lowlatency - 4.4.0.121.127
linux-image-powerpc-e500mc - 4.4.0.121.127
linux-image-powerpc-smp - 4.4.0.121.127
linux-image-powerpc64-emb - 4.4.0.121.127
linux-image-powerpc64-smp - 4.4.0.121.127
linux-image-raspi2 - 4.4.0.1087.87
linux-image-snapdragon - 4.4.0.1090.82

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