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Ubuntu 18.04 LTS USN-5774-1 Critical: Azure Kernel Security Threats

ubuntu
Calendar Grey December 12, 2022
Dist Ubuntu Esm H88
On January 15, 2023, Fedora tackled significant AWS kernel vulnerabilities, involving memory leaks and execution of unauthorized commands.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure-4.15: Linux kernel for Microsoft Azure Cloud systems

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

Details:

Jann Horn discovered that the Linux kernel did not properly track memory

allocations for anonymous VMA mappings in some situations, leading to

potential data structure reuse. A local attacker could use this to cause a

denial of service (system crash) or possibly execute arbitrary code.

(CVE-2022-42703)

It was discovered that a race condition existed in the instruction emulator

of the Linux kernel on Arm 64-bit systems. A local attacker could use this

to cause a denial of service (system crash). (CVE-2022-20422)

It was discovered that the KVM implementation in the Linux kernel did not

properly handle virtual CPUs without APICs in certain situations. A local

attacker could possibly use this to cause a denial of service (host system

crash). (CVE-...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical issue kernel ubuntu linux azure

Update Instructions

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

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1157-azure   4.15.0-1157.172
   linux-image-azure-lts-18.04     4.15.0.1157.125

Ubuntu 14.04 ESM:
   linux-image-4.15.0-1157-azure   4.15.0-1157.172~14.04.2
   linux-image-azure               4.15.0.1157.124

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-5774-1

CVE-2022-20422, CVE-2022-2153, CVE-2022-2978, CVE-2022-3028,

CVE-2022-3239, CVE-2022-3524, CVE-2022-3564, CVE-2022-3565,

CVE-2022-3566, CVE-2022-3567, CVE-2022-3594, CVE-2022-3621,

CVE-2022-3635, CVE-2022-36879, CVE-2022-40768, CVE-2022-42703

Severity
critical
Lowest
Low
Medium
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Critical

December 12, 2022

Topics%20covered

Topics Covered

security advisory denial of service critical issue kernel ubuntu linux azure

Package Information

https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1157.172

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