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Ubuntu 20.04 LTS USN-5106-1 Critical: Linux Kernel Security Fixes

ubuntu
Calendar Grey October 6, 2021
Dist Ubuntu Esm H88
An advisory from October 2021 outlines several vulnerabilities in the Linux kernel affecting Ubuntu 20.04 LTS, urging users to update swiftly to reduce security risks
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-oem-5.10: Linux kernel for OEM systems

Details:

Valentina Palmiotti discovered that the io_uring subsystem in the Linux

kernel could be coerced to free adjacent memory. A local attacker could use

this to execute arbitrary code. (CVE-2021-41073)

It was discovered that the Linux kernel did not properly enforce certain

types of entries in the Secure Boot Forbidden Signature Database (aka dbx)

protection mechanism. An attacker could use this to bypass UEFI Secure Boot

restrictions. (CVE-2020-26541)

It was discovered that the KVM hypervisor implementation in the Linux

kernel did not properly perform reference counting in some situations,

leading to a use-after-free vulnerability. An attacker who could start and

control a VM could possibly use this to expose sensitive information or

execute arbitrary code. (CVE-2021-22543)

Murray McAllister discovered that the joystick device interface in the

Linu...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update critical arbitrary code ubuntu linux kernel

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.10.0-1049-oem     5.10.0-1049.51
  linux-image-oem-20.04           5.10.0.1049.51
  linux-image-oem-20.04b          5.10.0.1049.51

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-5106-1

CVE-2020-26541, CVE-2021-22543, CVE-2021-3612, CVE-2021-38160,

CVE-2021-38199, CVE-2021-41073

Severity
critical
Lowest
Low
Medium
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Critical

October 06, 2021

Topics%20covered

Topics Covered

security advisory denial of service kernel update critical arbitrary code ubuntu linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-oem-5.10/5.10.0-1049.51

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