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Ubuntu 20.04 and 18.04 USN-6069-1 Urgent: Linux Kernel Privilege Escalation

ubuntu
Calendar Grey May 10, 2023
Dist Ubuntu Esm H88
Explore the critical Linux kernel issue in Ubuntu impacting user privileges and learn the necessary updates now.
The system could be made to run programs as an administrator.

Summary

The system could be made to run programs as an administrator.

Software Description:

- linux-raspi: Linux kernel for Raspberry Pi systems

- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

- linux-raspi2: Linux kernel for Raspberry Pi systems

Details:

It was discovered that the Traffic-Control Index (TCINDEX) implementation

in the Linux kernel did not properly perform filter deactivation in some

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

privileges. Please note that with the fix for this CVE, kernel support for

the TCINDEX classifier has been removed.

Topics%20covered

Topics Covered

security advisory kernel update critical privilege escalation ubuntu linux kernel

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1084-raspi    5.4.0-1084.95
   linux-image-raspi               5.4.0.1084.114
   linux-image-raspi2              5.4.0.1084.114

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1131-raspi2  4.15.0-1131.139
   linux-image-5.4.0-1084-raspi    5.4.0-1084.95~18.04.1
   linux-image-raspi-hwe-18.04     5.4.0.1084.81
   linux-image-raspi2              4.15.0.1131.126

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-6069-1

CVE-2023-1829

Severity
critical
Lowest
Low
Medium
High
Critical

May 10, 2023

Topics%20covered

Topics Covered

security advisory kernel update critical privilege escalation ubuntu linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1084.95
https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1084.95~18.04.1
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1131.139

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