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Ubuntu 20.04 LTS USN-6261-1 Critical: Linux IoT Kernel Threats

ubuntu
Calendar Grey July 28, 2023
Dist Ubuntu Esm H88
Tackling essential security flaws in Linux IoT systems with guidelines for Ubuntu 20.04 LTS users. Safeguard your gadgets today.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-iot: Linux kernel for IoT platforms

Details:

It was discovered that the IP-VLAN network driver for the Linux kernel did

not properly initialize memory in some situations, leading to an out-of-

bounds write vulnerability. An attacker could use this to cause a denial of

service (system crash) or possibly execute arbitrary code. (CVE-2023-3090)

Shir Tamari and Sagi Tzadik discovered that the OverlayFS implementation in

the Ubuntu Linux kernel did not properly perform permission checks in

certain situations. A local attacker could possibly use this to gain

elevated privileges. (CVE-2023-32629)

It was discovered that the netfilter subsystem in the Linux kernel did not

properly handle some error conditions, 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-2023-3390)

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical update instructions ubuntu kernel threat linux-iot

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1018-iot      5.4.0-1018.19

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-6261-1

CVE-2023-3090, CVE-2023-32629, CVE-2023-3390, CVE-2023-35001

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6261-1

Topics%20covered

Topics Covered

security advisory denial of service critical update instructions ubuntu kernel threat linux-iot

Package Information

https://launchpad.net/ubuntu/+source/linux-iot/5.4.0-1018.19

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