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Ubuntu 20.04 LTS USN-7443-1 Critical: Kernel Security Flaw in Azure

ubuntu
Calendar Grey September 4, 2023
Dist Ubuntu Esm H88
Critical updates have been rolled out for the Linux kernel in Ubuntu 20.04 LTS, affecting AWS infrastructures. Ensure your systems are protected!
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure-5.4: 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 ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service update instructions ubuntu system crash linux kernel azure cloud

Update Instructions

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-5.4.0-1113-azure    5.4.0-1113.119~18.04.1
   linux-image-azure               5.4.0.1113.86

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-6337-1

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

CVE-2022-4269, CVE-2023-0590, CVE-2023-1611, CVE-2023-1855,

CVE-2023-1990, CVE-2023-2124, CVE-2023-2194, CVE-2023-28466,

CVE-2023-30772, CVE-2023-3111, CVE-2023-3141, CVE-2023-33203

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6337-1

Topics%20covered

Topics Covered

security advisory denial of service update instructions ubuntu system crash linux kernel azure cloud

Package Information

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