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Ubuntu 20.04 LTS: USN-5756-3 Moderate - Multiple Kernel Threats

ubuntu
Calendar Grey December 12, 2022
Dist Ubuntu Esm H88
Several security flaws in the Linux kernel for Ubuntu have been addressed. Learn about essential updates and possible 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

- linux-azure-5.4: 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 memory leak existed in the IPv6 implementation of

the Linux kernel. A local attacker could use this to cause a denial of

service (memory exhaustion). (CVE-2022-3524)

It was discovered that a race condition existed in the Bluetooth 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-202...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory DoS Ubuntu memory leak kernel local access error handling

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1098-azure    5.4.0-1098.104
   linux-image-azure-lts-20.04     5.4.0.1098.92

Ubuntu 18.04 LTS:
   linux-image-5.4.0-1098-azure    5.4.0-1098.104~18.04.2
   linux-image-azure               5.4.0.1098.72

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-5756-3

https://ubuntu.com/security/notices/USN-5756-1

CVE-2022-3524, CVE-2022-3564, CVE-2022-3565, CVE-2022-3566,

CVE-2022-3567, CVE-2022-3594, CVE-2022-3621, CVE-2022-42703

December 12, 2022

Topics%20covered

Topics Covered

security advisory DoS Ubuntu memory leak kernel local access error handling

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1098.104
https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1098.104~18.04.2

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