Ubuntu 18.04 LTS: USN-4680-1 Moderate: Kernel DoS Threats Addressed

ubuntu

January 5, 2021

Several security issues were fixed in the Linux kernel.

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-azure-4.15: Linux kernel for Microsoft Azure Cloud systems

- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems

- linux-gke-4.15: Linux kernel for Google Container Engine (GKE) systems

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi2: Linux kernel for Raspberry Pi (V8) systems

- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

It was discovered that debugfs in the Linux kernel as used by blktrace

contained a use-after-free in some situations. A privileg...

Read the Full Advisory

Topics Covered

security advisory remote exploit DoS Ubuntu local exploit multiple issues kernel updates linux kernel system exploit DoS risk vulnerability report

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1062-oracle  4.15.0-1062.68
  linux-image-4.15.0-1077-gke     4.15.0-1077.82
  linux-image-4.15.0-1077-raspi2  4.15.0-1077.82
  linux-image-4.15.0-1082-kvm     4.15.0-1082.84
  linux-image-4.15.0-1091-aws     4.15.0-1091.96
  linux-image-4.15.0-1091-gcp     4.15.0-1091.104
  linux-image-4.15.0-1094-snapdragon  4.15.0-1094.103
  linux-image-4.15.0-1103-azure   4.15.0-1103.114
  linux-image-4.15.0-129-generic  4.15.0-129.132
  linux-image-4.15.0-129-generic-lpae  4.15.0-129.132
  linux-image-4.15.0-129-lowlatency  4.15.0-129.132
  linux-image-aws-lts-18.04       4.15.0.1091.93
  linux-image-azure-lts-18.04     4.15.0.1103.76
  linux-image-gcp-lts-18.04       4.15.0.1091.109
  linux-image-generic             4.15.0.129.116
  linux-image-generic-lpae        4.15.0.129.116
  linux-image-gke                 4.15.0.1077.81
  linux-image-gke-4.15            4.15.0.1077.81
  linux-image-kvm                 4.15.0.1082.78
  linux-image-lowlatency          4.15.0.129.116
  linux-image-oracle-lts-18.04    4.15.0.1062.72
  linux-image-powerpc-e500mc      4.15.0.129.116
  linux-image-powerpc-smp         4.15.0.129.116
  linux-image-powerpc64-emb       4.15.0.129.116
  linux-image-powerpc64-smp       4.15.0.129.116
  linux-image-raspi2              4.15.0.1077.74
  linux-image-snapdragon          4.15.0.1094.97
  linux-image-virtual             4.15.0.129.116

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1062-oracle  4.15.0-1062.68~16.04.1
  linux-image-4.15.0-1091-aws     4.15.0-1091.96~16.04.1
  linux-image-4.15.0-1091-gcp     4.15.0-1091.104~16.04.1
  linux-image-4.15.0-1103-azure   4.15.0-1103.114~16.04.1
  linux-image-4.15.0-129-generic  4.15.0-129.132~16.04.1
  linux-image-4.15.0-129-generic-lpae  4.15.0-129.132~16.04.1
  linux-image-4.15.0-129-lowlatency  4.15.0-129.132~16.04.1
  linux-image-aws-hwe             4.15.0.1091.85
  linux-image-azure               4.15.0.1103.96
  linux-image-gcp                 4.15.0.1091.92
  linux-image-generic-hwe-16.04   4.15.0.129.128
  linux-image-generic-lpae-hwe-16.04  4.15.0.129.128
  linux-image-gke                 4.15.0.1091.92
  linux-image-lowlatency-hwe-16.04  4.15.0.129.128
  linux-image-oem                 4.15.0.129.128
  linux-image-oracle              4.15.0.1062.51
  linux-image-virtual-hwe-16.04   4.15.0.129.128

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1103-azure   4.15.0-1103.114~14.04.1
  linux-image-azure               4.15.0.1103.78

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.