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Ubuntu 16.04/14.04 ESM: USN-5361-1 Critical: Kernel DoS Threats

ubuntu
Calendar Grey March 31, 2022
Dist Ubuntu Esm H88
Significant vulnerabilities addressed in the Linux kernel that impact users on Ubuntu systems, necessitating prompt updates for enhanced security.
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:

It was discovered that the VFIO PCI driver in the Linux kernel did not

properly handle attempts to access disabled memory spaces. A local attacker

could use this to cause a denial of service (system crash).

(CVE-2020-12888)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did

not properly verify certain fragmented frames. A physically proximate

attacker could possibly use this issue to inject or decrypt packets.

(CVE-2020-26141)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation

accepted plaintext fragments in certain situations. A physically proximate

attacker could use this issue to inject packets. (CVE-2020-26145)

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu system crash wifi

Update Instructions

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

Ubuntu 16.04 ESM:
  linux-image-4.4.0-1104-kvm      4.4.0-1104.113
  linux-image-4.4.0-1139-aws      4.4.0-1139.153
  linux-image-4.4.0-223-generic   4.4.0-223.256
  linux-image-4.4.0-223-lowlatency  4.4.0-223.256
  linux-image-aws                 4.4.0.1139.144
  linux-image-generic             4.4.0.223.230
  linux-image-kvm                 4.4.0.1104.102
  linux-image-lowlatency          4.4.0.223.230
  linux-image-virtual             4.4.0.223.230

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1103-aws      4.4.0-1103.108
  linux-image-4.4.0-223-generic   4.4.0-223.256~14.04.1
  linux-image-4.4.0-223-lowlatency  4.4.0-223.256~14.04.1
  linux-image-aws                 4.4.0.1103.101
  linux-image-generic-lts-xenial  4.4.0.223.194
  linux-image-lowlatency-lts-xenial  4.4.0.223.194
  linux-image-virtual-lts-xenial  4.4.0.223.194

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-5361-1

CVE-2020-12888, CVE-2020-26141, CVE-2020-26145, CVE-2020-3702,

CVE-2021-0920, CVE-2021-0935, CVE-2021-28964, CVE-2021-31916,

CVE-2021-37159, CVE-2021-39636, CVE-2021-4083, CVE-2021-42739,

CVE-2021-43976, CVE-2021-45486

Severity
critical
Lowest
Low
Medium
High
Critical

April 01, 2022

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu system crash wifi

Package Information

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