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Ubuntu 14.04 and 16.04 Security Advisory: Critical Linux Kernel Risks

ubuntu
Calendar Grey March 22, 2022
Dist Ubuntu Esm H88
Ubuntu Security Advisory USN-5343-1 reveals important kernel patches for security flaws found in release versions 14.04 and 16.04.
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-kvm: Linux kernel for cloud environments

- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the

Linux kernel did not properly restrict access to the cgroups v1

release_agent feature. A local attacker could use this to gain

administrative privileges. (CVE-2022-0492)

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

properly restrict mount namespaces, when mounted with the non-default

allow_userns option set. A local attacker could use this to gain

administrative privileges. (CVE-2016-2853)

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

properly maintain POSIX ACL xattr data, when mounted with the non-default

allow_userns option. A local a...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical privilege escalation kernel ubuntu administrative access

Update Instructions

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

Ubuntu 16.04 ESM:
  linux-image-4.4.0-1103-kvm      4.4.0-1103.112
  linux-image-4.4.0-1138-aws      4.4.0-1138.152
  linux-image-4.4.0-222-generic   4.4.0-222.255
  linux-image-4.4.0-222-lowlatency  4.4.0-222.255
  linux-image-aws                 4.4.0.1138.143
  linux-image-generic             4.4.0.222.229
  linux-image-kvm                 4.4.0.1103.101
  linux-image-lowlatency          4.4.0.222.229
  linux-image-virtual             4.4.0.222.229

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1102-aws      4.4.0-1102.107
  linux-image-4.4.0-222-generic   4.4.0-222.255~14.04.1
  linux-image-4.4.0-222-lowlatency  4.4.0-222.255~14.04.1
  linux-image-aws                 4.4.0.1102.100
  linux-image-generic-lts-xenial  4.4.0.222.193
  linux-image-lowlatency-lts-xenial  4.4.0.222.193
  linux-image-virtual-lts-xenial  4.4.0.222.193

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

https://ubuntu.com/security/notices/USN-5343-1

CVE-2016-2853, CVE-2016-2854, CVE-2018-5995, CVE-2019-19449,

CVE-2020-12655, CVE-2020-25670, CVE-2020-25671, CVE-2020-25672,

CVE-2020-25673, CVE-2020-26139, CVE-2020-26147, CVE-2020-26555,

CVE-2020-26558, CVE-2020-36322, CVE-2020-36385, CVE-2021-0129,

CVE-2021-20292, CVE-2021-20317, CVE-2021-23134, CVE-2021-28688,

CVE-2021-28972, CVE-2021-29650, CVE-2021-32399, CVE-2021-33033,

CVE-2021-33034, CVE-2021-33098, CVE-2021-34693, CVE-2021-3483,

CVE-2021-3506, CVE-2021-3564, CVE-2021-3573, CVE-2021-3612,

CVE-2021-3679, CVE-2021-38160, CVE-2021-38198, CVE-2021-38204,

CVE-2021-38208, CVE-2021-39648, CVE-2021-40490, CVE-2021-42008,

CVE-2021-43389, CVE-2021-45095, CVE-2021-45469, CVE-2021-45485,

CVE-2022-0492

Severity
critical
Lowest
Low
Medium
High
Critical

March 22, 2022

Topics%20covered

Topics Covered

security advisory denial of service critical privilege escalation kernel ubuntu administrative access

Package Information

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