Ubuntu 23.04 USN-6250-1 Critical: Linux Kernel Security Issues

ubuntu

July 26, 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-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-lowlatency: Linux low latency kernel

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi: Linux kernel for Raspberry Pi systems

Details:

Stonejiajia, 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-2023-2640)

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...

Read the Full Advisory

Topics Covered

security advisory denial of service critical security fix kernel patch Ubuntu permission check

Update Instructions

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

Ubuntu 23.04:
   linux-image-6.2.0-1006-ibm      6.2.0-1006.6
   linux-image-6.2.0-1008-aws      6.2.0-1008.8
   linux-image-6.2.0-1008-azure    6.2.0-1008.8
   linux-image-6.2.0-1008-oracle   6.2.0-1008.8
   linux-image-6.2.0-1009-kvm      6.2.0-1009.9
   linux-image-6.2.0-1009-lowlatency  6.2.0-1009.9
   linux-image-6.2.0-1009-lowlatency-64k  6.2.0-1009.9
   linux-image-6.2.0-1009-raspi    6.2.0-1009.11
   linux-image-6.2.0-1010-gcp      6.2.0-1010.10
   linux-image-6.2.0-26-generic    6.2.0-26.26
   linux-image-6.2.0-26-generic-64k  6.2.0-26.26
   linux-image-6.2.0-26-generic-lpae  6.2.0-26.26
   linux-image-aws                 6.2.0.1008.9
   linux-image-azure               6.2.0.1008.8
   linux-image-gcp                 6.2.0.1010.10
   linux-image-generic             6.2.0.26.26
   linux-image-generic-64k         6.2.0.26.26
   linux-image-generic-lpae        6.2.0.26.26
   linux-image-ibm                 6.2.0.1006.6
   linux-image-kvm                 6.2.0.1009.9
   linux-image-lowlatency          6.2.0.1009.9
   linux-image-lowlatency-64k      6.2.0.1009.9
   linux-image-oracle              6.2.0.1008.8
   linux-image-raspi               6.2.0.1009.12
   linux-image-raspi-nolpae        6.2.0.1009.12
   linux-image-virtual             6.2.0.26.26

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.