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Ubuntu 18.04 LTS USN-5804-2 High: Kernel Buffer Overflow and DoS

ubuntu
Calendar Grey January 13, 2023
Dist Ubuntu Esm H88
Multiple vulnerabilities in the Linux kernel addressed in Ubuntu 18.04 LTS, focusing on memory safety and protection against potential denial of service scenarios.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) 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 a guest

VM could possibly use this to cause a d...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow kernel ubuntu linux-aws linux-gcp

Update Instructions

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

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1143-gcp     4.15.0-1143.159
   linux-image-4.15.0-1148-aws     4.15.0-1148.160
   linux-image-aws-lts-18.04       4.15.0.1148.146
   linux-image-gcp-lts-18.04       4.15.0.1143.157

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-5804-2

https://ubuntu.com/security/notices/USN-5804-1

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

January 13, 2023

Topics%20covered

Topics Covered

security advisory denial of service buffer overflow kernel ubuntu linux-aws linux-gcp

Package Information

https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1148.160
https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1143.159

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