Ubuntu 18.04 ESM: USN-6081-1 Moderate: Multiple Kernel Security Issues

ubuntu

May 16, 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-kvm: Linux kernel for cloud environments

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

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

this to cause a denial of servic...

Read the Full Advisory

Topics Covered

security advisory moderate denial service Ubuntu memory leak kernel AWS

Update Instructions

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

Ubuntu 18.04 LTS:
   linux-image-4.15.0-1140-kvm     4.15.0-1140.145
   linux-image-4.15.0-1156-aws     4.15.0-1156.169
   linux-image-4.15.0-211-generic  4.15.0-211.222
   linux-image-4.15.0-211-generic-lpae  4.15.0-211.222
   linux-image-4.15.0-211-lowlatency  4.15.0-211.222
   linux-image-aws-lts-18.04       4.15.0.1156.154
   linux-image-generic             4.15.0.211.194
   linux-image-generic-lpae        4.15.0.211.194
   linux-image-kvm                 4.15.0.1140.131
   linux-image-lowlatency          4.15.0.211.194
   linux-image-virtual             4.15.0.211.194

Ubuntu 16.04 ESM:
   linux-image-4.15.0-1156-aws     4.15.0-1156.169~16.04.1
   linux-image-aws-hwe             4.15.0.1156.139

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.