Alerts This Week
Warning Icon 1 640
Alerts This Week
Warning Icon 1 640

Ubuntu 20.04 LTS USN-6349-1: Critical Linux Kernel Denial of Service

ubuntu
Calendar Grey September 6, 2023
Dist Ubuntu Esm H88
Critical patches released for Ubuntu 20.04 LTS targeting various kernel flaws impacting Azure environments.
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

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)

Zi Fan Tan discovered that the binder IPC implementation in the Linux

kernel contained 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-2023-21255)

Juan Jose Lopez Jaimez, Meador Inge, Simon Scannell, and Nenad Stojanovski

discovered that the BPF verifier in the Linux kernel did not properly mark

registers for precision tracking in certain situations, leading to an out-

of-bounds access vulnerability. A local attacker could use this to cause a

denial of se...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service system update ubuntu linux kernel permission checks linux-azure

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1115-azure    5.4.0-1115.122
   linux-image-azure-lts-20.04     5.4.0.1115.108

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-6349-1

CVE-2023-2002, CVE-2023-21255, CVE-2023-2163, CVE-2023-2269,

CVE-2023-31084, CVE-2023-3268, CVE-2023-35823, CVE-2023-35824,

CVE-2023-35828

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6349-1

Topics%20covered

Topics Covered

security advisory denial of service system update ubuntu linux kernel permission checks linux-azure

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1115.122

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here