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Ubuntu 16.04 ESM Advisory USN-5580-1: Kernel Issues and Threats

ubuntu
Calendar Grey August 24, 2022
Dist Ubuntu Esm H88
Multiple vulnerabilities addressed in the Linux kernel impacting Ubuntu 16.04 ESM. Ensure timely updates to uphold security standards.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

Details:

It was discovered that the framebuffer driver on the Linux kernel did

not verify size limits when changing font or screen size, leading to an

out-of-bounds write. A local attacker could use this to cause a denial

of service (system crash) or possibly execute arbitrary code.

(CVE-2021-33655)

It was discovered that the virtual terminal driver in the Linux kernel

did not properly handle VGA console font changes, leading to an

out-of-bounds write. A local attacker could use this to cause a denial

of service (system crash) or possibly execute arbitrary code.

(CVE-2021-33656)

It was discovered that the Packet network protocol implementation in the

Linux kernel contained an out-of-bounds access. A remote attacker could

use this to expose sensitive information (kernel memory). (CVE-2022-20368)

Domingo D...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service ubuntu linux kernel out-of-bounds aws

Update Instructions

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

Ubuntu 16.04 ESM:
   linux-image-4.4.0-1150-aws      4.4.0-1150.165
   linux-image-aws                 4.4.0.1150.154

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-5580-1

CVE-2021-33655, CVE-2021-33656, CVE-2022-20368, CVE-2022-36946

Severity
critical
Lowest
Low
Medium
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Critical

August 24, 2022

Topics%20covered

Topics Covered

security advisory denial of service ubuntu linux kernel out-of-bounds aws

Package Information

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