USN-4093-1: Linux kernel vulnerabilities

13 August 2019

linux, linux-hwe, linux-azure, linux-gcp, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities

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

  • Ubuntu 19.04
  • Ubuntu 18.04 LTS

Summary

Several security issues were fixed in the Linux kernel.

Software Description

  • linux - Linux kernel
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-kvm - Linux kernel for cloud environments
  • linux-raspi2 - Linux kernel for Raspberry Pi 2
  • linux-snapdragon - Linux kernel for Snapdragon processors
  • linux-hwe - Linux hardware enablement (HWE) kernel

Details

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)

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)

It was discovered that a NULL pointer dereference vulnerability existed in the Near-field communication (NFC) implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2019-12984)

Jann Horn discovered a use-after-free vulnerability in the Linux kernel when accessing LDT entries in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2019-13233)

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 19.04
linux-image-5.0.0-1013-gcp - 5.0.0-1013.13
linux-image-5.0.0-1013-kvm - 5.0.0-1013.14
linux-image-5.0.0-1014-azure - 5.0.0-1014.14
linux-image-5.0.0-1014-raspi2 - 5.0.0-1014.14
linux-image-5.0.0-1018-snapdragon - 5.0.0-1018.19
linux-image-5.0.0-25-generic - 5.0.0-25.26
linux-image-5.0.0-25-generic-lpae - 5.0.0-25.26
linux-image-5.0.0-25-lowlatency - 5.0.0-25.26
linux-image-azure - 5.0.0.1014.13
linux-image-gcp - 5.0.0.1013.13
linux-image-generic - 5.0.0.25.26
linux-image-generic-lpae - 5.0.0.25.26
linux-image-gke - 5.0.0.1013.13
linux-image-kvm - 5.0.0.1013.13
linux-image-lowlatency - 5.0.0.25.26
linux-image-raspi2 - 5.0.0.1014.11
linux-image-snapdragon - 5.0.0.1018.11
linux-image-virtual - 5.0.0.25.26
Ubuntu 18.04 LTS
linux-image-5.0.0-1014-azure - 5.0.0-1014.14~18.04.1
linux-image-5.0.0-25-generic - 5.0.0-25.26~18.04.1
linux-image-5.0.0-25-generic-lpae - 5.0.0-25.26~18.04.1
linux-image-5.0.0-25-lowlatency - 5.0.0-25.26~18.04.1
linux-image-azure - 5.0.0.1014.25
linux-image-generic-hwe-18.04 - 5.0.0.25.82
linux-image-generic-lpae-hwe-18.04 - 5.0.0.25.82
linux-image-lowlatency-hwe-18.04 - 5.0.0.25.82
linux-image-snapdragon-hwe-18.04 - 5.0.0.25.82
linux-image-virtual-hwe-18.04 - 5.0.0.25.82

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