USN-3631-2: Linux kernel (Xenial HWE) vulnerabilities

24 April 2018

linux-lts-xenial, linux-aws vulnerabilities

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

  • Ubuntu 14.04 LTS

Summary

Several security issues were fixed in the Linux kernel.

Software Description

  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

Details

USN-3631-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04 LTS. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu 14.04 LTS.

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 14.04 LTS
linux-image-4.4.0-1017-aws - 4.4.0-1017.17
linux-image-4.4.0-121-generic - 4.4.0-121.145~14.04.1
linux-image-4.4.0-121-generic-lpae - 4.4.0-121.145~14.04.1
linux-image-4.4.0-121-lowlatency - 4.4.0-121.145~14.04.1
linux-image-4.4.0-121-powerpc-e500mc - 4.4.0-121.145~14.04.1
linux-image-4.4.0-121-powerpc-smp - 4.4.0-121.145~14.04.1
linux-image-4.4.0-121-powerpc64-emb - 4.4.0-121.145~14.04.1
linux-image-4.4.0-121-powerpc64-smp - 4.4.0-121.145~14.04.1
linux-image-aws - 4.4.0.1017.17
linux-image-generic-lpae-lts-xenial - 4.4.0.121.102
linux-image-generic-lts-xenial - 4.4.0.121.102
linux-image-lowlatency-lts-xenial - 4.4.0.121.102
linux-image-powerpc-e500mc-lts-xenial - 4.4.0.121.102
linux-image-powerpc-smp-lts-xenial - 4.4.0.121.102
linux-image-powerpc64-emb-lts-xenial - 4.4.0.121.102
linux-image-powerpc64-smp-lts-xenial - 4.4.0.121.102

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