Ubuntu 18.04 LTS USN-5920-1 Critical: Kernel Denial Of Service Fixes

ubuntu

March 3, 2023

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-dell300x: Linux kernel for Dell 300x platforms

- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems

- linux-oracle: Linux kernel for Oracle Cloud systems

Details:

It was discovered that the Upper Level Protocol (ULP) subsystem in the

Linux kernel did not properly handle sockets entering the LISTEN state in

certain protocols, 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-2023-0461)

Kyle Zeng discovered that the sysctl implementation in the Linux kernel

contained a stack-based buffer overflow. A local attacker could use this to

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

(CVE-2022-4378)

It was discovered that a race condition existed ...

Read the Full Advisory

Topics Covered

security advisory denial of service critical software update Ubuntu kernel

Update Instructions

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

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1061-dell300x  4.15.0-1061.66
   linux-image-4.15.0-1115-oracle  4.15.0-1115.126
   linux-image-4.15.0-1146-gcp     4.15.0-1146.162
   linux-image-4.15.0-1151-aws     4.15.0-1151.164
   linux-image-4.15.0-206-generic  4.15.0-206.217
   linux-image-4.15.0-206-generic-lpae  4.15.0-206.217
   linux-image-4.15.0-206-lowlatency  4.15.0-206.217
   linux-image-aws-lts-18.04       4.15.0.1151.149
   linux-image-dell300x            4.15.0.1061.60
   linux-image-gcp-lts-18.04       4.15.0.1146.160
   linux-image-generic             4.15.0.206.189
   linux-image-generic-lpae        4.15.0.206.189
   linux-image-lowlatency          4.15.0.206.189
   linux-image-oracle-lts-18.04    4.15.0.1115.120
   linux-image-virtual             4.15.0.206.189

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.