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Ubuntu 20.04 LTS: USN-5267-3 Critical: Linux Kernel DoS Issues

ubuntu
Calendar Grey February 17, 2022
Dist Ubuntu Esm H88
The latest Ubuntu updates tackle kernel issues affecting Raspberry Pi units, enhancing overall performance and system resilience.
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 systems

- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

Details:

USN-5267-1 fixed vulnerabilities in the Linux kernel. This

update provides the corresponding updates for the Linux kernel

for Raspberry Pi devices.

Original advisory details:

It was discovered that the Bluetooth subsystem in the Linux kernel

contained 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-2021-3640)

Likang Luo discovered that a race condition existed in the Bluetooth

subsystem of the Linux kernel, 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-2021-3752)

Luo Likang discovered that the FireDTV Firewire driver in the Linux kernel

did not properly perform...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu 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-5.4.0-1052-raspi    5.4.0-1052.58
  linux-image-raspi               5.4.0.1052.86
  linux-image-raspi2              5.4.0.1052.86

Ubuntu 18.04 LTS:
  linux-image-5.4.0-1052-raspi    5.4.0-1052.58~18.04.1
  linux-image-raspi-hwe-18.04     5.4.0.1052.54

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-5267-3

https://ubuntu.com/security/notices/USN-5267-1

CVE-2021-3640, CVE-2021-3752, CVE-2021-42739

Severity
critical
Lowest
Low
Medium
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Critical

February 17, 2022

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu Linux kernel Raspberry Pi

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1052.58
https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1052.58~18.04.1

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