Ubuntu 23.04 USN-6186-1 Critical: Kernel Denial of Service Threats

ubuntu

June 22, 2023

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

- linux-ibm: Linux kernel for IBM cloud systems

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

Details:

Patryk Sondej and Piotr Krysiuk discovered that a race condition existed in

the netfilter subsystem of the Linux kernel when processing batch requests,

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-2023-32233)

Gwangun Jung discovered that the Quick Fair Queueing scheduler

implementation in the Linux kernel contained an out-of-bounds write

vulnerability. A local attacker could use this to cause a denial of service

(system crash) or possibly execute arbitrary code. (CVE-2023-31436)

Rei...

Read the Full Advisory

Topics Covered

security advisory denial of service critical issue patch kernel ubuntu system crash

Update Instructions

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

Ubuntu 23.04:
   linux-image-6.2.0-1003-ibm      6.2.0-1003.3
   linux-image-6.2.0-1005-azure    6.2.0-1005.5
   linux-image-6.2.0-1005-oracle   6.2.0-1005.5
   linux-image-6.2.0-1006-kvm      6.2.0-1006.6
   linux-image-6.2.0-1007-gcp      6.2.0-1007.7
   linux-image-azure               6.2.0.1005.5
   linux-image-gcp                 6.2.0.1007.7
   linux-image-ibm                 6.2.0.1003.3
   linux-image-kvm                 6.2.0.1006.6
   linux-image-oracle              6.2.0.1005.5

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.