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Ubuntu 20.04 LTS USN-5791-2 Moderate: Linux Kernel DoS Risks

ubuntu
Calendar Grey January 9, 2023
Dist Ubuntu Esm H88
Mitigating numerous weaknesses within the Linux kernel associated with Ubuntu 20.04 LTS to safeguard against prospective risks.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

Details:

It was discovered that a race condition existed in the Android Binder IPC

subsystem in 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-2022-20421)

David Leadbeater discovered that the netfilter IRC protocol tracking

implementation in the Linux Kernel incorrectly handled certain message

payloads in some situations. A remote attacker could possibly use this to

cause a denial of service or bypass firewall filtering. (CVE-2022-2663)

It was discovered that the Intel 740 frame buffer driver in the Linux

kernel contained a divide by zero vulnerability. A local attacker could use

this to cause a denial of service (system crash). (CVE-2022-3061)

It was discovered that the sound subsystem i...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service system update local attack ubuntu linux kernel linux-azure

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1100-azure    5.4.0-1100.106
   linux-image-azure-lts-20.04     5.4.0.1100.93

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-5791-2

https://ubuntu.com/security/notices/USN-5791-1

CVE-2022-20421, CVE-2022-2663, CVE-2022-3061, CVE-2022-3303,

CVE-2022-3586, CVE-2022-3646, CVE-2022-39842, CVE-2022-40307,

CVE-2022-4095, CVE-2022-43750

January 09, 2023

Topics%20covered

Topics Covered

security advisory denial of service system update local attack ubuntu linux kernel linux-azure

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1100.106

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