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Ubuntu 20.04 LTS USN-5654-1: Kernel Denial of Service Threats

ubuntu
Calendar Grey October 4, 2022
Dist Ubuntu Esm H88
Numerous vulnerabilities have been addressed in the Ubuntu Linux kernel, providing crucial guidance for users to implement updates effectively.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gke: Linux kernel for Google Container Engine (GKE) systems

Details:

It was discovered that the framebuffer driver on the Linux kernel did not

verify size limits when changing font or screen size, leading to an out-of-bounds write. A local attacker could use this to cause a denial of service

(system crash) or possibly execute arbitrary code. (CVE-2021-33655)

Moshe Kol, Amit Klein and Yossi Gilad discovered that the IP implementation

in the Linux kernel did not provide sufficient randomization when

calculating port offsets. An attacker could possibly use this to expose

sensitive information. (CVE-2022-1012, CVE-2022-32296)

Norbert Slusarek discovered that a race condition existed in the perf

subsystem in the Linux kernel, resulting in a use-after-free vulnerability.

A privileged local attacker could use this to cause a denial of service

(system crash) or possibly execute ar...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service security issue Ubuntu system crash Linux kernel linux-gke

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1083-gke      5.4.0-1083.89
   linux-image-gke                 5.4.0.1083.91
   linux-image-gke-5.4             5.4.0.1083.91

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-5654-1

CVE-2021-33655, CVE-2022-1012, CVE-2022-1729, CVE-2022-2503,

CVE-2022-32296, CVE-2022-36946

Severity
important
Lowest
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Critical

October 04, 2022

Topics%20covered

Topics Covered

security advisory denial of service security issue Ubuntu system crash Linux kernel linux-gke

Package Information

https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1083.89

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