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Ubuntu 20.04 LTS USN-6331-1 Critical: Linux Kernel Denial Of Service

ubuntu
Calendar Grey September 1, 2023
Dist Ubuntu Esm H88
A collection of patch updates for the linux-azure core aimed at mitigating multiple denial of service vulnerabilities and preventing potential system failures.
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 the netlink implementation in the Linux kernel did

not properly validate policies when parsing attributes in some situations.

An attacker could use this to cause a denial of service (infinite

recursion). (CVE-2020-36691)

Billy Jheng Bing Jhong discovered that the CIFS network file system

implementation in the Linux kernel did not properly validate arguments to

ioctl() in some situations. A local attacker could possibly use this to

cause a denial of service (system crash). (CVE-2022-0168)

It was discovered that the ext4 file system implementation in the Linux

kernel contained a use-after-free vulnerability. An attacker could use this

to construct a malicious ext4 file system image that, when mounted, could

cause a denial of service (system crash). (CVE-2022-1184)

It was discovered that...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service security fix ubuntu system crash 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-5.4.0-1114-azure    5.4.0-1114.120
   linux-image-azure-lts-20.04     5.4.0.1114.107

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-6331-1

CVE-2020-36691, CVE-2022-0168, CVE-2022-1184, CVE-2022-27672,

CVE-2022-40982, CVE-2022-4269, CVE-2023-0590, CVE-2023-1611,

CVE-2023-1855, CVE-2023-1990, CVE-2023-20593, CVE-2023-2124,

CVE-2023-2194, CVE-2023-28466, CVE-2023-30772, CVE-2023-3111,

CVE-2023-3141, CVE-2023-33203, CVE-2023-3609, CVE-2023-3611,

CVE-2023-3776

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6331-1

Topics%20covered

Topics Covered

security advisory denial of service security fix ubuntu system crash linux kernel linux-azure

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1114.120

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