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Ubuntu 20.04/18.04 USN-4945-2 Critical: Linux Kernel Denial of Service

ubuntu
Calendar Grey May 19, 2021
Dist Ubuntu Esm H88
Essential patches for Ubuntu 20.04 and 18.04 LTS rectify several Linux kernel vulnerabilities impacting Raspberry Pi devices.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-raspi: Linux kernel for Raspberry Pi (V8) systems

- linux-raspi-5.4: Linux kernel for Raspberry Pi (V8) systems

Details:

USN-4945-1 fixed vulnerabilities in the Linux kernel for Ubuntu

20.04 LTS and Ubuntu 18.04 LTS. This update provides the corresponding

Linux kernel updates targeted specifically for Raspberry Pi devices

in those same Ubuntu Releases.

Original advisory details:

It was discovered that the Nouveau GPU driver in the Linux kernel did not

properly handle error conditions in some situations. A local attacker could

use this to cause a denial of service (system crash). (CVE-2020-25639)

Jan Beulich discovered that the Xen netback backend in the Linux kernel did

not properly handle certain error conditions under paravirtualization. An

attacker in a guest VM could possibly use this to cause a denial of service

(host domain crash). (CVE-2021-28038)

It was discovered that the fastrpc d...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update critical Ubuntu Denial of Service system crash Linux kernel Raspberry Pi

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.4.0-1035-raspi    5.4.0-1035.38
  linux-image-raspi               5.4.0.1035.70
  linux-image-raspi2              5.4.0.1035.70

Ubuntu 18.04 LTS:
  linux-image-5.4.0-1035-raspi    5.4.0-1035.38~18.04.1
  linux-image-raspi-hwe-18.04     5.4.0.1035.37

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-4945-2

https://ubuntu.com/security/notices/USN-4945-1

CVE-2020-25639, CVE-2021-28038, CVE-2021-28375, CVE-2021-28660,

CVE-2021-29265, CVE-2021-29650, CVE-2021-30002

Severity
critical
Lowest
Low
Medium
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Critical

May 19, 2021

Topics%20covered

Topics Covered

security advisory denial of service kernel update critical Ubuntu Denial of Service system crash Linux kernel Raspberry Pi

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1035.38
https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1035.38~18.04.1

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