USN-4135-2: Linux kernel vulnerabilities

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

Source: USN-4135-2: Linux kernel vulnerabilities

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