USN-4211-1: Linux kernel vulnerabilities

U

Ubuntu security notices

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


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). (CVE-2019-17133)

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-4.4.0-1063-kvm - 4.4.0-1063.70
linux-image-4.4.0-1099-aws - 4.4.0-1099.110
linux-image-4.4.0-1126-raspi2 - 4.4.0-1126.135
linux-image-4.4.0-1130-snapdragon - 4.4.0-1130.138
linux-image-4.4.0-170-generic - 4.4.0-170.199
linux-image-4.4.0-170-generic-lpae - 4.4.0-170.199
linux-image-4.4.0-170-lowlatency - 4.4.0-170.199
linux-image-4.4.0-170-powerpc-e500mc - 4.4.0-170.199
linux-image-4.4.0-170-powerpc-smp - 4.4.0-170.199
linux-image-4.4.0-170-powerpc64-emb - 4.4.0-170.199
linux-image-4.4.0-170-powerpc64-smp - 4.4.0-170.199
linux-image-aws - 4.4.0.1099.103
linux-image-generic - 4.4.0.170.178
linux-image-generic-lpae - 4.4.0.170.178
linux-image-kvm - 4.4.0.1063.63
linux-image-lowlatency - 4.4.0.170.178
linux-image-powerpc-e500mc - 4.4.0.170.178
linux-image-powerpc-smp - 4.4.0.170.178
linux-image-powerpc64-emb - 4.4.0.170.178
linux-image-powerpc64-smp - 4.4.0.170.178
linux-image-raspi2 - 4.4.0.1126.126
linux-image-snapdragon - 4.4.0.1130.122
linux-image-virtual - 4.4.0.170.178

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


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