==========================================================================
Ubuntu Security Notice USN-6604-1
January 25, 2024

linux, linux-aws, linux-aws-hwe, linux-gcp, linux-gcp-4.15, linux-hwe,
linux-kvm, linux-oracle vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

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-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-oracle: Linux kernel for Oracle Cloud systems

Details:

It was discovered that the ASUS HID driver in the Linux kernel did not
properly handle device removal, leading to a use-after-free vulnerability.
A local attacker with physical access could plug in a specially crafted USB
device to cause a denial of service (system crash). (CVE-2023-1079)

Jana Hofmann, Emanuele Vannacci, Cedric Fournet, Boris Kopf, and Oleksii
Oleksenko discovered that some AMD processors could leak stale data from
division operations in certain situations. A local attacker could possibly
use this to expose sensitive information. (CVE-2023-20588)

It was discovered that a race condition existed in the Linux kernel when
performing operations with kernel objects, leading to an out-of-bounds
write. A local attacker could use this to cause a denial of service (system
crash) or execute arbitrary code. (CVE-2023-45863)

It was discovered that the CIFS network file system implementation in the
Linux kernel did not properly validate the server frame size in certain
situation, leading to an out-of-bounds read vulnerability. An attacker
could use this to construct a malicious CIFS image that, when operated on,
could cause a denial of service (system crash) or possibly expose sensitive
information. (CVE-2023-6606)

Budimir Markovic, Lucas De Marchi, and Pengfei Xu discovered that the perf
subsystem in the Linux kernel did not properly validate all event sizes
when attaching new events, leading to an out-of-bounds write vulnerability.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2023-6931)

It was discovered that the IGMP protocol implementation in the Linux kernel
contained a race condition, leading to a use-after-free vulnerability. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2023-6932)

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1148-kvm     4.15.0-1148.153
   linux-image-4.15.0-1158-gcp     4.15.0-1158.175
   linux-image-4.15.0-1164-aws     4.15.0-1164.177
   linux-image-4.15.0-221-generic  4.15.0-221.232
   linux-image-4.15.0-221-lowlatency  4.15.0-221.232
   linux-image-aws-lts-18.04       4.15.0.1164.162
   linux-image-gcp-lts-18.04       4.15.0.1158.172
   linux-image-generic             4.15.0.221.205
   linux-image-kvm                 4.15.0.1148.139
   linux-image-lowlatency          4.15.0.221.205
   linux-image-virtual             4.15.0.221.205

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1127-oracle  4.15.0-1127.138~16.04.1
   linux-image-4.15.0-1158-gcp     4.15.0-1158.175~16.04.1
   linux-image-4.15.0-1164-aws     4.15.0-1164.177~16.04.1
   linux-image-4.15.0-221-generic  4.15.0-221.232~16.04.1
   linux-image-4.15.0-221-lowlatency  4.15.0-221.232~16.04.1
   linux-image-aws-hwe             4.15.0.1164.147
   linux-image-gcp                 4.15.0.1158.148
   linux-image-generic-hwe-16.04   4.15.0.221.5
   linux-image-gke                 4.15.0.1158.148
   linux-image-lowlatency-hwe-16.04  4.15.0.221.5
   linux-image-oem                 4.15.0.221.5
   linux-image-oracle              4.15.0.1127.108
   linux-image-virtual-hwe-16.04   4.15.0.221.5

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-6604-1
   CVE-2023-1079, CVE-2023-20588, CVE-2023-45863, CVE-2023-6606,
   CVE-2023-6931, CVE-2023-6932