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Ubuntu 18.04 LTS USN-5094-2 Severe: Kernel Security Threats Detail

ubuntu
Calendar Grey September 30, 2021
Dist Ubuntu Esm H88
Essential patches address kernel flaws in Ubuntu 18.04 LTS. Update immediately to avert service disruptions and safeguard data breaches.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-raspi2: Linux kernel for Raspberry Pi systems

Details:

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)

It was discovered that the tracing subsystem in the Linux kernel did not

properly keep track of per-cpu ring buffer state. A privileged attacker

could use this to cause a denial of service. (CVE-2021-3679)

Alois Wohlschlager discovered that the overlay file system in the Linux

kernel did not restrict private clones in some situations. An attacker

could use this to expose sensitive information. (CVE-2021-3732)

It was discovered that the MAX-3421 host USB device driver in the Linux

kernel did not properly handle devi...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu system update data exposure Linux kernel severe threat

Update Instructions

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1096-raspi2  4.15.0-1096.102
  linux-image-raspi2              4.15.0.1096.94

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-5094-2

https://ubuntu.com/security/notices/USN-5094-1

CVE-2021-22543, CVE-2021-3679, CVE-2021-3732, CVE-2021-38204,

CVE-2021-38205

Severity
important
Lowest
Low
Medium
High
Critical

September 30, 2021

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu system update data exposure Linux kernel severe threat

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1096.102

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