USN-4363-1: Linux kernel vulnerabilities

USN-4363-1: Linux kernel vulnerabilities

linux, linux-aws, linux-aws-hwe, linux-gcp, linux-gke-4.15, linux-hwe, linux-oem, linux-oracle, linux-snapdragon vulnerabilities

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

  • Ubuntu 18.04 LTS
  • 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-gke-4.15 – Linux kernel for Google Container Engine (GKE) systems
  • linux-oem – Linux kernel for OEM systems
  • linux-oracle – Linux kernel for Oracle Cloud systems
  • linux-snapdragon – Linux kernel for Qualcomm Snapdragon processors
  • linux-aws-hwe – Linux kernel for Amazon Web Services (AWS-HWE) systems
  • linux-gcp – Linux kernel for Google Cloud Platform (GCP) systems
  • linux-hwe – Linux hardware enablement (HWE) kernel

Details

It was discovered that the Serial CAN interface driver in the Linux kernel
did not properly initialize data. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2020-11494)

It was discovered that the linux kernel did not properly validate certain
mount options to the tmpfs virtual memory file system. A local attacker
with the ability to specify mount options could use this to cause a denial
of service (system crash). (CVE-2020-11565)

David Gibson discovered that the Linux kernel on Power9 CPUs did not
properly save and restore Authority Mask registers state in some
situations. A local attacker in a guest VM could use this to cause a denial
of service (host system crash). (CVE-2020-11669)

It was discovered that the block layer in the Linux kernel contained a race
condition leading to a use-after-free vulnerability. A local attacker could
possibly use this to cause a denial of service (system crash) or execute
arbitrary code. (CVE-2020-12657)

Update instructions

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

Ubuntu 18.04 LTS
linux-image-4.15.0-101-generic4.15.0-101.102
linux-image-4.15.0-101-generic-lpae4.15.0-101.102
linux-image-4.15.0-101-lowlatency4.15.0-101.102
linux-image-4.15.0-1039-oracle4.15.0-1039.43
linux-image-4.15.0-1059-gke4.15.0-1059.62
linux-image-4.15.0-1067-aws4.15.0-1067.71
linux-image-4.15.0-1079-snapdragon4.15.0-1079.86
linux-image-4.15.0-1081-oem4.15.0-1081.91
linux-image-aws-lts-18.04 – 4.15.0.1067.70
linux-image-generic – 4.15.0.101.91
linux-image-generic-lpae – 4.15.0.101.91
linux-image-gke – 4.15.0.1059.63
linux-image-gke-4.15 – 4.15.0.1059.63
linux-image-lowlatency – 4.15.0.101.91
linux-image-oem – 4.15.0.1081.85
linux-image-oracle-lts-18.04 – 4.15.0.1039.48
linux-image-powerpc-e500mc – 4.15.0.101.91
linux-image-powerpc-smp – 4.15.0.101.91
linux-image-powerpc64-emb – 4.15.0.101.91
linux-image-powerpc64-smp – 4.15.0.101.91
linux-image-snapdragon – 4.15.0.1079.82
linux-image-virtual – 4.15.0.101.91
Ubuntu 16.04 LTS
linux-image-4.15.0-101-generic4.15.0-101.102~16.04.1
linux-image-4.15.0-101-generic-lpae4.15.0-101.102~16.04.1
linux-image-4.15.0-101-lowlatency4.15.0-101.102~16.04.1
linux-image-4.15.0-1039-oracle4.15.0-1039.43~16.04.1
linux-image-4.15.0-1067-aws4.15.0-1067.71~16.04.1
linux-image-4.15.0-1071-gcp4.15.0-1071.81~16.04.1
linux-image-aws-hwe – 4.15.0.1067.67
linux-image-gcp – 4.15.0.1071.77
linux-image-generic-hwe-16.04 – 4.15.0.101.108
linux-image-generic-lpae-hwe-16.04 – 4.15.0.101.108
linux-image-gke – 4.15.0.1071.77
linux-image-lowlatency-hwe-16.04 – 4.15.0.101.108
linux-image-oem – 4.15.0.101.108
linux-image-oracle – 4.15.0.1039.32
linux-image-virtual-hwe-16.04 – 4.15.0.101.108

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

Source: USN-4363-1: Linux kernel vulnerabilities

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