Ubuntu 18.04 LTS USN-4907-1 Critical Kernel DoS Risks Mitigation

ubuntu

April 13, 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-dell300x: Linux kernel for Dell 300x platforms

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

Details:

Wen Xu discovered that the xfs file system implementation in the Linux

kernel did not properly validate the number of extents in an inode. An

attacker could use this to construct a malicious xfs ima...

Read the Full Advisory

Topics Covered

security advisory security issue kernel ubuntu system crash kernel updates system fix dos linux kernel doS risk

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1016-dell300x  4.15.0-1016.20
  linux-image-4.15.0-1069-oracle  4.15.0-1069.77
  linux-image-4.15.0-1083-raspi2  4.15.0-1083.88
  linux-image-4.15.0-1089-kvm     4.15.0-1089.91
  linux-image-4.15.0-1097-gcp     4.15.0-1097.110
  linux-image-4.15.0-1098-aws     4.15.0-1098.105
  linux-image-4.15.0-1100-snapdragon  4.15.0-1100.109
  linux-image-4.15.0-1112-azure   4.15.0-1112.125
  linux-image-4.15.0-141-generic  4.15.0-141.145
  linux-image-4.15.0-141-generic-lpae  4.15.0-141.145
  linux-image-4.15.0-141-lowlatency  4.15.0-141.145
  linux-image-aws-lts-18.04       4.15.0.1098.101
  linux-image-azure-lts-18.04     4.15.0.1112.85
  linux-image-dell300x            4.15.0.1016.18
  linux-image-gcp-lts-18.04       4.15.0.1097.115
  linux-image-generic             4.15.0.141.128
  linux-image-generic-lpae        4.15.0.141.128
  linux-image-kvm                 4.15.0.1089.85
  linux-image-lowlatency          4.15.0.141.128
  linux-image-oracle-lts-18.04    4.15.0.1069.79
  linux-image-powerpc-e500mc      4.15.0.141.128
  linux-image-powerpc-smp         4.15.0.141.128
  linux-image-powerpc64-emb       4.15.0.141.128
  linux-image-powerpc64-smp       4.15.0.141.128
  linux-image-raspi2              4.15.0.1083.80
  linux-image-snapdragon          4.15.0.1100.103
  linux-image-virtual             4.15.0.141.128

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1069-oracle  4.15.0-1069.77~16.04.1
  linux-image-4.15.0-1097-gcp     4.15.0-1097.110~16.04.1
  linux-image-4.15.0-1098-aws     4.15.0-1098.105~16.04.1
  linux-image-4.15.0-1112-azure   4.15.0-1112.124~16.04.1
  linux-image-aws-hwe             4.15.0.1098.91
  linux-image-azure               4.15.0.1112.103
  linux-image-gcp                 4.15.0.1097.98
  linux-image-gke                 4.15.0.1097.98
  linux-image-oracle              4.15.0.1069.57

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1112-azure   4.15.0-1112.124~14.04.1
  linux-image-azure               4.15.0.1112.85

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.