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

Ubuntu 20.04 LTS Critical Advisory: Multiple Kernel Issues Resolved

ubuntu
Calendar Grey January 27, 2023
Dist Ubuntu Esm H88
Numerous vulnerabilities in Ubuntu's Linux kernel addressed, reinforcing system security and mitigating potential remote execution threats.
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-azure-5.4: Linux kernel for Microsoft Azure cloud systems

- linux-raspi2: Linux kernel for Raspberry Pi systems

Details:

It was discovered that the NFSD implementation in the Linux kernel did not

properly handle some RPC messages, leading to a buffer overflow. A remote

attacker could use this to cause a denial of service (system crash) or

possibly execute arbitrary code. (CVE-2022-43945)

Tamás Koczka discovered that the Bluetooth L2CAP handshake implementation

in the Linux kernel contained multiple use-after-free vulnerabilities. A

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

(system crash) or possibly execute arbitrary code. (CVE-2022-42896)

It was discovered that the Xen netback driver in the Linux kernel did not

properly handle packets structured in certain ways. An attacker in ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow critical Ubuntu update instructions kernel issue

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1101-azure    5.4.0-1101.107
   linux-image-azure-lts-20.04     5.4.0.1101.94

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1126-raspi2  4.15.0-1126.134
   linux-image-5.4.0-1101-azure    5.4.0-1101.107~18.04.1
   linux-image-azure               5.4.0.1101.74
   linux-image-raspi2              4.15.0.1126.121

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-5830-1

CVE-2022-3643, CVE-2022-42896, CVE-2022-43945, CVE-2022-45934

Severity
critical
Lowest
Low
Medium
High
Critical

January 27, 2023

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow critical Ubuntu update instructions kernel issue

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1101.107
https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1101.107~18.04.1
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1126.134

Get the latest News and Insights

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

Your message here