USN-4211-1: Linux kernel vulnerabilities

USN-4211-1: Linux kernel vulnerabilities

linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities

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

  • Ubuntu 16.04 LTS


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-kvm – Linux kernel for cloud environments
  • linux-raspi2 – Linux kernel for Raspberry Pi 2
  • linux-snapdragon – Linux kernel for Snapdragon processors


Zhipeng Xie discovered that an infinite loop could be triggered in the CFS
Linux kernel process scheduler. A local attacker could possibly use this to
cause a denial of service. (CVE-2018-20784)

Nicolas Waisman discovered that the WiFi driver stack in the Linux kernel
did not properly validate SSID lengths. A physically proximate attacker
could use this to cause a denial of service (system crash).

Nicolas Waisman discovered that the Chelsio T4/T5 RDMA Driver for the Linux
kernel performed DMA from a kernel stack. A local attacker could use this
to cause a denial of service (system crash). (CVE-2019-17075)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-aws –
linux-image-generic –
linux-image-generic-lpae –
linux-image-kvm –
linux-image-lowlatency –
linux-image-powerpc-e500mc –
linux-image-powerpc-smp –
linux-image-powerpc64-emb –
linux-image-powerpc64-smp –
linux-image-raspi2 –
linux-image-snapdragon –
linux-image-virtual –

To update your system, please follow these instructions:

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.


Source: USN-4211-1: Linux kernel vulnerabilities

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