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Ubuntu 18.04 LTS USN-6095-1 Critical: Multiple Kernel Threats

ubuntu
Calendar Grey May 22, 2023
Dist Ubuntu Esm H88
Ubuntu fixed multiple kernel issues affecting the Linux operating system. Update now for enhanced security features.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-raspi2: Linux kernel for Raspberry Pi systems

- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

Jordy Zomer and Alexandra Sandulescu discovered that the Linux kernel did

not properly implement speculative execution barriers in usercopy functions

in certain situations. A local attacker could use this to expose sensitive

information (kernel memory). (CVE-2023-0459)

Xingyuan Mo discovered that the x86 KVM implementation in the Linux kernel

did not properly initialize some data structures. A local attacker could

use this to expose sensitive information (kernel memory). (CVE-2023-1513)

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

TCP implementation in the Linux kernel. A local attacker could possibly use

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory kernel update Ubuntu information exposure Trivial DoS

Update Instructions

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

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1132-raspi2  4.15.0-1132.140
   linux-image-4.15.0-1150-snapdragon  4.15.0-1150.160
   linux-image-raspi2              4.15.0.1132.127
   linux-image-snapdragon          4.15.0.1150.149

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1150-gcp     4.15.0-1150.166~16.04.1
   linux-image-4.15.0-211-generic  4.15.0-211.222~16.04.1
   linux-image-4.15.0-211-lowlatency  4.15.0-211.222~16.04.1
   linux-image-gcp                 4.15.0.1150.140
   linux-image-generic-hwe-16.04   4.15.0.211.196
   linux-image-gke                 4.15.0.1150.140
   linux-image-lowlatency-hwe-16.04  4.15.0.211.196
   linux-image-oem                 4.15.0.211.196
   linux-image-virtual-hwe-16.04   4.15.0.211.196

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-6095-1

CVE-2023-0459, CVE-2023-1118, CVE-2023-1513, CVE-2023-2162,

CVE-2023-32269

Severity
critical
Lowest
Low
Medium
High
Critical

May 22, 2023

Topics%20covered

Topics Covered

security advisory kernel update Ubuntu information exposure Trivial DoS

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1132.140
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1150.160

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