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Ubuntu 20.04 LTS USN-5648-1 Critical: linux-gke-5.15 DoS Threats

ubuntu
Calendar Grey September 30, 2022
Dist Ubuntu Esm H88
Numerous vulnerabilities addressed in Ubuntu's linux-gke-5.15 kernel, affecting system integrity and safeguarding user data.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gke-5.15: 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)

Duoming Zhou discovered that race conditions existed in the timer handling

implementation of the Linux kernel's Rose X.25 protocol layer, resulting in

use-after-free vulnerabilities. A local attacker could use this to cause a

denial of service (system crash). (CVE-2022-2318)

Roger Pau Monné discovered that the Xen virtual block driver in the Linux

kernel did not properly initialize memory pages to be used for shared

communication with the backend. A local attacker could use this to expose

sensitive information (g...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu system crash linux kernel

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.15.0-1016-gke     5.15.0-1016.19~20.04.1
   linux-image-gke-5.15            5.15.0.1016.19~20.04.1

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-5648-1

CVE-2021-33655, CVE-2022-2318, CVE-2022-26365, CVE-2022-33740,

CVE-2022-33741, CVE-2022-33742, CVE-2022-33743, CVE-2022-33744,

CVE-2022-34494, CVE-2022-34495, CVE-2022-36946

Severity
critical
Lowest
Low
Medium
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Critical

September 30, 2022

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu system crash linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-gke-5.15/5.15.0-1016.19~20.04.1

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