Ubuntu 23.04: USN-6283-1 Critical Kernel Denial Of Service Issues

ubuntu

August 11, 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:

Ruihan Li discovered that the bluetooth subsystem in the Linux kernel did

not properly perform permissions checks when handling HCI sockets. A

physically proximate attacker could use this to cause a denial of service

(bluetooth communication). (CVE-2023-2002)

Zheng Zhang discovered that the device-mapper implementation in the Linux

kernel did not properly handle locking during table_clear() operations. A

local attac...

Read the Full Advisory

Topics Covered

security advisory denial of service security issue critical update instructions ubuntu linux kernel

Update Instructions

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

Ubuntu 23.04:
   linux-image-6.2.0-1007-ibm      6.2.0-1007.7
   linux-image-6.2.0-1009-aws      6.2.0-1009.9
   linux-image-6.2.0-1009-azure    6.2.0-1009.9
   linux-image-6.2.0-1009-oracle   6.2.0-1009.9
   linux-image-6.2.0-1010-kvm      6.2.0-1010.10
   linux-image-6.2.0-1010-lowlatency  6.2.0-1010.10
   linux-image-6.2.0-1010-lowlatency-64k  6.2.0-1010.10
   linux-image-6.2.0-1010-raspi    6.2.0-1010.12
   linux-image-6.2.0-1011-gcp      6.2.0-1011.11
   linux-image-6.2.0-27-generic    6.2.0-27.28
   linux-image-6.2.0-27-generic-64k  6.2.0-27.28
   linux-image-6.2.0-27-generic-lpae  6.2.0-27.28
   linux-image-aws                 6.2.0.1009.10
   linux-image-azure               6.2.0.1009.9
   linux-image-gcp                 6.2.0.1011.11
   linux-image-generic             6.2.0.27.27
   linux-image-generic-64k         6.2.0.27.27
   linux-image-generic-lpae        6.2.0.27.27
   linux-image-ibm                 6.2.0.1007.7
   linux-image-kvm                 6.2.0.1010.10
   linux-image-lowlatency          6.2.0.1010.10
   linux-image-lowlatency-64k      6.2.0.1010.10
   linux-image-oracle              6.2.0.1009.9
   linux-image-raspi               6.2.0.1010.13
   linux-image-raspi-nolpae        6.2.0.1010.13
   linux-image-virtual             6.2.0.27.27

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.