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Ubuntu 18.04 LTS USN-6329-1 Critical: Linux Kernel Threats Resolved

ubuntu
Calendar Grey September 1, 2023
Dist Ubuntu Esm H88
A number of security vulnerabilities within the Linux kernel addressed in Ubuntu 18.04 LTS require immediate updates and system restarts.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems

- linux-oracle-5.4: Linux kernel for Oracle Cloud systems

Details:

Daniel Moghimi discovered that some Intel(R) Processors did not properly

clear microarchitectural state after speculative execution of various

instructions. A local unprivileged user could use this to obtain to

sensitive information. (CVE-2022-40982)

Tavis Ormandy discovered that some AMD processors did not properly handle

speculative execution of certain vector register instructions. A local

attacker could use this to expose sensitive information. (CVE-2023-20593)

It was discovered that the universal 32bit network packet classifier

implementation in the Linux kernel did not properly perform reference

counting in some situations, leading to a use-after-free vulnerability. A

local attacker could use this to cause a denial of service (system crash)

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu use-after-free speculative execution

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-5.4.0-1107-oracle   5.4.0-1107.116~18.04.1
   linux-image-5.4.0-1111-gcp      5.4.0-1111.120~18.04.1
   linux-image-gcp                 5.4.0.1111.87
   linux-image-oracle              5.4.0.1107.116~18.04.79

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-6329-1

CVE-2022-40982, CVE-2023-20593, CVE-2023-3609, CVE-2023-3611,

CVE-2023-3776

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6329-1

Topics%20covered

Topics Covered

security advisory denial of service critical kernel ubuntu use-after-free speculative execution

Package Information

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