Ubuntu 18.04 LTS USN-5854-1 Moderate: Kernel Security Risks

ubuntu

February 9, 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-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi2: Linux kernel for Raspberry Pi systems

Details:

It was discovered that an out-of-bounds write vulnerability existed in the

Video for Linux 2 (V4L2) implementation in the Linux kernel. A local

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

possibly execute arbitrary code. (CVE-2022-20369)

Pawan Kumar Gupta, Alyssa Milburn, Amit Peled, Shani Rehana, Nir Shildan

and Ariel Sabba discovered that some Intel processors with Enhanced

Indirect Branch Restricted Speculation (eIBRS) did not properly handle RET

instructions after a VM exits. A local attacker could potentially use this

to expose sen...

Read the Full Advisory

Topics Covered

security advisory denial of service code execution kernel ubuntu memory exhaustion out-of-bounds

Update Instructions

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

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1114-oracle  4.15.0-1114.125
   linux-image-4.15.0-1127-raspi2  4.15.0-1127.135
   linux-image-4.15.0-1135-kvm     4.15.0-1135.140
   linux-image-4.15.0-1145-gcp     4.15.0-1145.161
   linux-image-4.15.0-1150-aws     4.15.0-1150.163
   linux-image-4.15.0-204-generic  4.15.0-204.215
   linux-image-4.15.0-204-generic-lpae  4.15.0-204.215
   linux-image-4.15.0-204-lowlatency  4.15.0-204.215
   linux-image-aws-lts-18.04       4.15.0.1150.148
   linux-image-gcp-lts-18.04       4.15.0.1145.159
   linux-image-generic             4.15.0.204.187
   linux-image-generic-lpae        4.15.0.204.187
   linux-image-kvm                 4.15.0.1135.126
   linux-image-lowlatency          4.15.0.204.187
   linux-image-oracle-lts-18.04    4.15.0.1114.119
   linux-image-raspi2              4.15.0.1127.122
   linux-image-virtual             4.15.0.204.187

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.