A Linux kernel security update has been released for Ubuntu Linux 18.04 LTS.

USN-5984-1: Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-5984-1
March 29, 2023

linux, linux-aws, linux-dell300x, linux-kvm, linux-oracle, linux-raspi2
vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS

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-dell300x: Linux kernel for Dell 300x platforms
- 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 the System V IPC implementation in the Linux kernel
did not properly handle large shared memory counts. A local attacker could
use this to cause a denial of service (memory exhaustion). (CVE-2021-3669)

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 vulnerability. A local attacker
could use this to cause a denial of service (system crash).
(CVE-2022-36280)

Hyunwoo Kim discovered that the DVB Core driver in the Linux kernel did not
properly perform reference counting in some situations, 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-2022-41218)

It was discovered that the network queuing discipline implementation in the
Linux kernel contained a null pointer dereference in some situations. A
local attacker could use this to cause a denial of service (system crash).
(CVE-2022-47929)

José Oliveira and Rodrigo Branco discovered that the prctl syscall
implementation in the Linux kernel did not properly protect against
indirect branch prediction attacks in some situations. A local attacker
could possibly use this to expose sensitive information. (CVE-2023-0045)

It was discovered that a use-after-free vulnerability existed in the
Advanced Linux Sound Architecture (ALSA) subsystem. A local attacker could
use this to cause a denial of service (system crash). (CVE-2023-0266)

Kyle Zeng discovered that the IPv6 implementation in the Linux kernel
contained a NULL pointer dereference vulnerability in certain situations. A
local attacker could use this to cause a denial of service (system crash).
(CVE-2023-0394)

Kyle Zeng discovered that the ATM VC queuing discipline implementation in
the Linux kernel contained a type confusion vulnerability in some
situations. An attacker could use this to cause a denial of service (system
crash). (CVE-2023-23455)

It was discovered that the RNDIS USB driver in the Linux kernel contained
an integer overflow vulnerability. A local attacker with physical access
could plug in a malicious USB device to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2023-23559)

Wei Chen discovered that the DVB USB AZ6027 driver in the Linux kernel
contained a null pointer dereference when handling certain messages from
user space. A local attacker could use this to cause a denial of service
(system crash). (CVE-2023-28328)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1062-dell300x 4.15.0-1062.67
linux-image-4.15.0-1116-oracle 4.15.0-1116.127
linux-image-4.15.0-1129-raspi2 4.15.0-1129.137
linux-image-4.15.0-1137-kvm 4.15.0-1137.142
linux-image-4.15.0-1153-aws 4.15.0-1153.166
linux-image-4.15.0-208-generic 4.15.0-208.220
linux-image-4.15.0-208-generic-lpae 4.15.0-208.220
linux-image-4.15.0-208-lowlatency 4.15.0-208.220
linux-image-aws-lts-18.04 4.15.0.1153.151
linux-image-dell300x 4.15.0.1062.61
linux-image-generic 4.15.0.208.191
linux-image-generic-lpae 4.15.0.208.191
linux-image-kvm 4.15.0.1137.128
linux-image-lowlatency 4.15.0.208.191
linux-image-oracle-lts-18.04 4.15.0.1116.121
linux-image-raspi2 4.15.0.1129.124
linux-image-virtual 4.15.0.208.191

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-5984-1
CVE-2021-3669, CVE-2022-3424, CVE-2022-36280, CVE-2022-41218,
CVE-2022-47929, CVE-2023-0045, CVE-2023-0266, CVE-2023-0394,
CVE-2023-23455, CVE-2023-23559, CVE-2023-28328

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-208.220
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1153.166
https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1062.67
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1137.142
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1116.127
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1129.137