1. Ubuntu Security Notices
  2. USN-4135-2

USN-4135-2: Linux kernel vulnerabilities

Publication date

18 September 2019

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-lts-trusty - Linux hardware enablement kernel from Trusty for Precise ESM
  • linux-lts-xenial - Linux hardware enablement kernel from Xenial for Trusty

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)

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

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

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

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References

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