USN-4135-2: Linux kernel vulnerabilities

18 September 2019

linux, linux-aws, linux-azure, linux-lts-trusty, linux-lts-xenial vulnerabilities

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

  • Ubuntu 14.04 ESM
  • Ubuntu 12.04 ESM

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-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty
  • linux-lts-trusty - Linux hardware enablement kernel from Trusty for Precise ESM

Details

Peter Pi discovered a buffer overflow in the virtio network backend (vhost_net) implementation in the Linux kernel. An attacker in a guest may be able to use this to cause a denial of service (host OS crash) or possibly execute arbitrary code in the host OS. (CVE-2019-14835)

It was discovered that the Linux kernel on PowerPC architectures did not properly handle Facility Unavailable exceptions in some situations. A local attacker could use this to expose sensitive information. (CVE-2019-15030)

It was discovered that the Linux kernel on PowerPC architectures did not properly handle exceptions on interrupts in some situations. A local attacker could use this to expose sensitive information. (CVE-2019-15031)

Update instructions

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

Ubuntu 14.04 ESM
linux-image-3.13.0-173-generic - 3.13.0-173.224
linux-image-3.13.0-173-generic-lpae - 3.13.0-173.224
linux-image-3.13.0-173-lowlatency - 3.13.0-173.224
linux-image-3.13.0-173-powerpc-e500 - 3.13.0-173.224
linux-image-3.13.0-173-powerpc-e500mc - 3.13.0-173.224
linux-image-3.13.0-173-powerpc-smp - 3.13.0-173.224
linux-image-3.13.0-173-powerpc64-emb - 3.13.0-173.224
linux-image-3.13.0-173-powerpc64-smp - 3.13.0-173.224
linux-image-4.15.0-1059-azure - 4.15.0-1059.64~14.04.1
linux-image-4.4.0-1054-aws - 4.4.0-1054.58
linux-image-4.4.0-164-generic - 4.4.0-164.192~14.04.1
linux-image-4.4.0-164-generic-lpae - 4.4.0-164.192~14.04.1
linux-image-4.4.0-164-lowlatency - 4.4.0-164.192~14.04.1
linux-image-4.4.0-164-powerpc-e500mc - 4.4.0-164.192~14.04.1
linux-image-4.4.0-164-powerpc-smp - 4.4.0-164.192~14.04.1
linux-image-4.4.0-164-powerpc64-emb - 4.4.0-164.192~14.04.1
linux-image-4.4.0-164-powerpc64-smp - 4.4.0-164.192~14.04.1
linux-image-aws - 4.4.0.1054.55
linux-image-azure - 4.15.0.1059.45
linux-image-generic - 3.13.0.173.184
linux-image-generic-lpae - 3.13.0.173.184
linux-image-generic-lpae-lts-xenial - 4.4.0.164.143
linux-image-generic-lts-xenial - 4.4.0.164.143
linux-image-lowlatency - 3.13.0.173.184
linux-image-lowlatency-lts-xenial - 4.4.0.164.143
linux-image-powerpc-e500 - 3.13.0.173.184
linux-image-powerpc-e500mc - 3.13.0.173.184
linux-image-powerpc-e500mc-lts-xenial - 4.4.0.164.143
linux-image-powerpc-smp - 3.13.0.173.184
linux-image-powerpc-smp-lts-xenial - 4.4.0.164.143
linux-image-powerpc64-emb - 3.13.0.173.184
linux-image-powerpc64-emb-lts-xenial - 4.4.0.164.143
linux-image-powerpc64-smp - 3.13.0.173.184
linux-image-powerpc64-smp-lts-xenial - 4.4.0.164.143
linux-image-server - 3.13.0.173.184
linux-image-virtual - 3.13.0.173.184
linux-image-virtual-lts-xenial - 4.4.0.164.143
Ubuntu 12.04 ESM
linux-image-3.13.0-173-generic - 3.13.0-173.224~12.04.1
linux-image-3.13.0-173-generic-lpae - 3.13.0-173.224~12.04.1
linux-image-3.13.0-173-lowlatency - 3.13.0-173.224~12.04.1
linux-image-3.2.0-143-generic - 3.2.0-143.190
linux-image-3.2.0-143-generic-pae - 3.2.0-143.190
linux-image-3.2.0-143-highbank - 3.2.0-143.190
linux-image-3.2.0-143-omap - 3.2.0-143.190
linux-image-3.2.0-143-powerpc-smp - 3.2.0-143.190
linux-image-3.2.0-143-powerpc64-smp - 3.2.0-143.190
linux-image-3.2.0-143-virtual - 3.2.0-143.190
linux-image-generic - 3.2.0.143.158
linux-image-generic-lpae-lts-trusty - 3.13.0.173.161
linux-image-generic-lts-trusty - 3.13.0.173.161
linux-image-generic-pae - 3.2.0.143.158
linux-image-highbank - 3.2.0.143.158
linux-image-omap - 3.2.0.143.158
linux-image-powerpc - 3.2.0.143.158
linux-image-powerpc-smp - 3.2.0.143.158
linux-image-powerpc64-smp - 3.2.0.143.158
linux-image-server - 3.2.0.143.158
linux-image-virtual - 3.2.0.143.158

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