Ubuntu 22.04 Critical Advisory USN-5987-1: Kernel Threats Overview

ubuntu

March 29, 2023

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gke: Linux kernel for Google Container Engine (GKE) systems

- linux-ibm: Linux kernel for IBM cloud systems

- linux-kvm: Linux kernel for cloud environments

- linux-gke-5.15: Linux kernel for Google Container Engine (GKE) systems

Details:

It was discovered that the KVM VMX implementation in the Linux kernel did

not properly handle indirect branch prediction isolation between L1 and L2

VMs. An attacker in a guest VM could use this to expose sensitive

information from the host OS or other guest VMs. (CVE-2022-2196)

It was discovered that a use-after-free vulnerability existed in the SGI

GRU driver in the Linux kernel. A local attacker could possibly use this to

cause a denial of service (system crash) or possibly execute arbitrary

code. (CVE-2022-3424)

Ziming Zhang discovered that the VMware Virtual GPU DRM driver in the Linux

kernel contained an out-of-bounds write vulner...

Read the Full Advisory

Topics Covered

security advisory denial of service critical issue Ubuntu information exposure system crash kernel threats

Update Instructions

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

Ubuntu 22.04 LTS:
   linux-image-5.15.0-1027-ibm     5.15.0-1027.30
   linux-image-5.15.0-1030-gke     5.15.0-1030.35
   linux-image-5.15.0-1030-kvm     5.15.0-1030.35
   linux-image-gke                 5.15.0.1030.29
   linux-image-gke-5.15            5.15.0.1030.29
   linux-image-ibm                 5.15.0.1027.23
   linux-image-kvm                 5.15.0.1030.26

Ubuntu 20.04 LTS:
   linux-image-5.15.0-1029-gke     5.15.0-1029.34~20.04.1
   linux-image-gke-5.15            5.15.0.1029.34~20.04.1

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.