USN-4095-1: Linux kernel vulnerabilities

13 August 2019

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

Eli Biham and Lior Neumann discovered that the Bluetooth implementation in the Linux kernel did not properly validate elliptic curve parameters during Diffie-Hellman key exchange in some situations. An attacker could use this to expose sensitive information. (CVE-2018-5383)

It was discovered that a heap buffer overflow existed in the Marvell Wireless LAN device driver for the Linux kernel. An attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-10126)

Andrei Vlad Lutas and Dan Lutas discovered that some x86 processors incorrectly handle SWAPGS instructions during speculative execution. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2019-1125)

Jann Horn discovered that a race condition existed in the Linux kernel when performing core dumps. A local attacker could use this to cause a denial of service (system crash) or expose sensitive information. (CVE-2019-11599)

It was discovered that the PowerPC dlpar implementation in the Linux kernel did not properly check for allocation errors in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2019-12614)

Jann Horn discovered that the ptrace implementation in the Linux kernel did not properly record credentials in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly gain administrative privileges. (CVE-2019-13272)

It was discovered that the Marvell Wireless LAN device driver in the Linux kernel did not properly validate the BSS descriptor. A local attacker could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-3846)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-4.4.0-1054-kvm - 4.4.0-1054.61
linux-image-4.4.0-1090-aws - 4.4.0-1090.101
linux-image-4.4.0-1118-raspi2 - 4.4.0-1118.127
linux-image-4.4.0-1122-snapdragon - 4.4.0-1122.128
linux-image-4.4.0-159-generic - 4.4.0-159.187
linux-image-4.4.0-159-generic-lpae - 4.4.0-159.187
linux-image-4.4.0-159-lowlatency - 4.4.0-159.187
linux-image-4.4.0-159-powerpc-e500mc - 4.4.0-159.187
linux-image-4.4.0-159-powerpc-smp - 4.4.0-159.187
linux-image-4.4.0-159-powerpc64-emb - 4.4.0-159.187
linux-image-4.4.0-159-powerpc64-smp - 4.4.0-159.187
linux-image-aws - 4.4.0.1090.94
linux-image-generic - 4.4.0.159.167
linux-image-generic-lpae - 4.4.0.159.167
linux-image-kvm - 4.4.0.1054.54
linux-image-lowlatency - 4.4.0.159.167
linux-image-powerpc-e500mc - 4.4.0.159.167
linux-image-powerpc-smp - 4.4.0.159.167
linux-image-powerpc64-emb - 4.4.0.159.167
linux-image-powerpc64-smp - 4.4.0.159.167
linux-image-raspi2 - 4.4.0.1118.118
linux-image-snapdragon - 4.4.0.1122.114
linux-image-virtual - 4.4.0.159.167

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