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Ubuntu 20.04 LTS USN-5470-1 Critical Kernel Updates for OEM Systems

ubuntu
Calendar Grey June 8, 2022
Dist Ubuntu Esm H88
Explore the latest kernel updates in Ubuntu 20.04 that tackle critical security issues, such as denial of service scenarios and additional vulnerabilities.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-5.14: Linux kernel for OEM systems

Details:

It was discovered that the Linux kernel did not properly restrict access to

the kernel debugger when booted in secure boot environments. A privileged

attacker could use this to bypass UEFI Secure Boot restrictions.

(CVE-2022-21499)

Aaron Adams discovered that the netfilter subsystem in the Linux kernel did

not properly handle the removal of stateful expressions in some situations,

leading to a use-after-free vulnerability. A local attacker could use this

to cause a denial of service (system crash) or execute arbitrary code.

(CVE-2022-1966)

Minh Yuan discovered that the floppy driver in the Linux kernel contained a

race condition in some situations, leading to a use-after-free

vulnerability. A local attacker could use this to cause a denial of service

(system crash) or possibly execute arbitrary code. (CVE-2022-1836)

Ziming Zhang discovered that...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update Ubuntu arbitrary code system crash OEM

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.14.0-1042-oem     5.14.0-1042.47
  linux-image-oem-20.04           5.14.0.1042.38
  linux-image-oem-20.04b          5.14.0.1042.38
  linux-image-oem-20.04c          5.14.0.1042.38
  linux-image-oem-20.04d          5.14.0.1042.38

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-5470-1

CVE-2022-1836, CVE-2022-1966, CVE-2022-1972, CVE-2022-21499

Severity
critical
Lowest
Low
Medium
High
Critical

June 08, 2022

Topics%20covered

Topics Covered

security advisory denial of service kernel update Ubuntu arbitrary code system crash OEM

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.14/5.14.0-1042.47

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