Ubuntu 18.04: USN-5136-1 Moderate: Kernel Denial Of Service Issues

ubuntu

November 8, 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 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-hwe: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the f2fs file system in the Linux kernel did not

properly validate metadata in some situations. An attacker could use this

to construct a malicious f2fs image that, when mounted and operated on,

...

Read the Full Advisory

Topics Covered

security advisory denial of service Ubuntu arbitrary code system crash kernel issues

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1030-dell300x  4.15.0-1030.35
  linux-image-4.15.0-1083-oracle  4.15.0-1083.91
  linux-image-4.15.0-1098-raspi2  4.15.0-1098.104
  linux-image-4.15.0-1102-kvm     4.15.0-1102.104
  linux-image-4.15.0-1111-gcp     4.15.0-1111.125
  linux-image-4.15.0-1115-aws     4.15.0-1115.122
  linux-image-4.15.0-1115-snapdragon  4.15.0-1115.124
  linux-image-4.15.0-1126-azure   4.15.0-1126.139
  linux-image-4.15.0-162-generic  4.15.0-162.170
  linux-image-4.15.0-162-generic-lpae  4.15.0-162.170
  linux-image-4.15.0-162-lowlatency  4.15.0-162.170
  linux-image-aws-lts-18.04       4.15.0.1115.118
  linux-image-azure-lts-18.04     4.15.0.1126.99
  linux-image-dell300x            4.15.0.1030.32
  linux-image-gcp-lts-18.04       4.15.0.1111.130
  linux-image-generic             4.15.0.162.151
  linux-image-generic-lpae        4.15.0.162.151
  linux-image-kvm                 4.15.0.1102.98
  linux-image-lowlatency          4.15.0.162.151
  linux-image-oracle-lts-18.04    4.15.0.1083.93
  linux-image-raspi2              4.15.0.1098.96
  linux-image-snapdragon          4.15.0.1115.118
  linux-image-virtual             4.15.0.162.151

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1083-oracle  4.15.0-1083.91~16.04.1
  linux-image-4.15.0-1115-aws     4.15.0-1115.122~16.04.1
  linux-image-4.15.0-1126-azure   4.15.0-1126.139~16.04.1
  linux-image-4.15.0-162-generic  4.15.0-162.170~16.04.1
  linux-image-4.15.0-162-lowlatency  4.15.0-162.170~16.04.1
  linux-image-aws-hwe             4.15.0.1115.105
  linux-image-azure               4.15.0.1126.117
  linux-image-generic-hwe-16.04   4.15.0.162.155
  linux-image-lowlatency-hwe-16.04  4.15.0.162.155
  linux-image-oem                 4.15.0.162.155
  linux-image-oracle              4.15.0.1083.71
  linux-image-virtual-hwe-16.04   4.15.0.162.155

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1126-azure   4.15.0-1126.139~14.04.1
  linux-image-azure               4.15.0.1126.99

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.