USN-3364-1: Linux kernel vulnerabilities

24 July 2017

linux, 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-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon processors

Details

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 16.04 LTS
linux-image-4.4.0-1065-raspi2 - 4.4.0-1065.73
linux-image-4.4.0-1067-snapdragon - 4.4.0-1067.72
linux-image-4.4.0-87-generic - 4.4.0-87.110
linux-image-4.4.0-87-generic-lpae - 4.4.0-87.110
linux-image-4.4.0-87-lowlatency - 4.4.0-87.110
linux-image-4.4.0-87-powerpc-e500mc - 4.4.0-87.110
linux-image-4.4.0-87-powerpc-smp - 4.4.0-87.110
linux-image-4.4.0-87-powerpc64-emb - 4.4.0-87.110
linux-image-4.4.0-87-powerpc64-smp - 4.4.0-87.110
linux-image-generic - 4.4.0.87.93
linux-image-generic-lpae - 4.4.0.87.93
linux-image-lowlatency - 4.4.0.87.93
linux-image-powerpc-e500mc - 4.4.0.87.93
linux-image-powerpc-smp - 4.4.0.87.93
linux-image-powerpc64-emb - 4.4.0.87.93
linux-image-powerpc64-smp - 4.4.0.87.93
linux-image-raspi2 - 4.4.0.1065.66
linux-image-snapdragon - 4.4.0.1067.60

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