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Ubuntu 20.04 LTS USN-5485-2 Critical: Linux Kernel Security Risks

ubuntu
Calendar Grey July 1, 2022
Dist Ubuntu Esm H88
Alert Bulletin USN-5485-2 outlines remediation for linux-oem-5.14 flaws affecting Ubuntu 20.04 LTS installations.
Several security issues were mitigated in the Linux kernel.

Summary

Several security issues were mitigated in the Linux kernel.

Software Description:

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

Details:

It was discovered that some Intel processors did not completely perform

cleanup actions on multi-core shared buffers. A local attacker could

possibly use this to expose sensitive information. (CVE-2022-21123)

It was discovered that some Intel processors did not completely perform

cleanup actions on microarchitectural fill buffers. A local attacker could

possibly use this to expose sensitive information. (CVE-2022-21125)

It was discovered that some Intel processors did not properly perform

cleanup during specific special register write operations. A local attacker

could possibly use this to expose sensitive information. (CVE-2022-21166)

Topics%20covered

Topics Covered

security advisory critical Ubuntu kernel local attack sensitive information linux-oem

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.14.0-1044-oem     5.14.0-1044.49
  linux-image-oem-20.04           5.14.0.1044.40
  linux-image-oem-20.04b          5.14.0.1044.40
  linux-image-oem-20.04c          5.14.0.1044.40
  linux-image-oem-20.04d          5.14.0.1044.40

Please note that fully mitigating processor vulnerabilities requires
corresponding processor microcode/firmware updates.

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-5485-2

https://ubuntu.com/security/notices/USN-5485-1

CVE-2022-21123, CVE-2022-21125, CVE-2022-21166

Severity
critical
Lowest
Low
Medium
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Critical

July 01, 2022

Topics%20covered

Topics Covered

security advisory critical Ubuntu kernel local attack sensitive information linux-oem

Package Information

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