USN-3364-2: Linux kernel (Xenial HWE) vulnerabilities

24 July 2017

linux-lts-xenial 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-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

Details

USN-3364-1 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 the Linux kernel did not properly initialize a Wake- on-Lan data structure. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2014-9900)

It was discovered that the Linux kernel did not properly restrict access to /proc/iomem. A local attacker could use this to expose sensitive information. (CVE-2015-8944)

Alexander Potapenko discovered a race condition in the Advanced Linux Sound Architecture (ALSA) subsystem in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2017-1000380)

Li Qiang discovered that the DRM driver for VMware Virtual GPUs in the Linux kernel did not properly validate some ioctl arguments. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-7346)

Jann Horn discovered that bpf in Linux kernel does not restrict the output of the print_bpf_insn function. A local attacker could use this to obtain sensitive address information. (CVE-2017-9150)

Murray McAllister discovered that the DRM driver for VMware Virtual GPUs in the Linux kernel did not properly initialize memory. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2017-9605)

Update instructions

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

Ubuntu 14.04 LTS
linux-image-4.4.0-87-generic - 4.4.0-87.110~14.04.1
linux-image-4.4.0-87-generic-lpae - 4.4.0-87.110~14.04.1
linux-image-4.4.0-87-lowlatency - 4.4.0-87.110~14.04.1
linux-image-4.4.0-87-powerpc-e500mc - 4.4.0-87.110~14.04.1
linux-image-4.4.0-87-powerpc-smp - 4.4.0-87.110~14.04.1
linux-image-4.4.0-87-powerpc64-emb - 4.4.0-87.110~14.04.1
linux-image-4.4.0-87-powerpc64-smp - 4.4.0-87.110~14.04.1
linux-image-generic-lpae-lts-xenial - 4.4.0.87.72
linux-image-generic-lts-xenial - 4.4.0.87.72
linux-image-lowlatency-lts-xenial - 4.4.0.87.72
linux-image-powerpc-e500mc-lts-xenial - 4.4.0.87.72
linux-image-powerpc-smp-lts-xenial - 4.4.0.87.72
linux-image-powerpc64-emb-lts-xenial - 4.4.0.87.72
linux-image-powerpc64-smp-lts-xenial - 4.4.0.87.72

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