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

USN-5560-1: Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-5560-1
August 10, 2022

linux, linux-aws, linux-azure-4.15, linux-dell300x, linux-gcp-4.15,
linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon 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-azure-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-dell300x: Linux kernel for Dell 300x platforms
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi2: Linux kernel for Raspberry Pi systems
- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors

Details:

Zhenpeng Lin discovered that the network packet scheduler implementation in
the Linux kernel did not properly remove all references to a route filter
before freeing it in some situations. A local attacker could use this to
cause a denial of service (system crash) or execute arbitrary code.
(CVE-2022-2588)

It was discovered that the netfilter subsystem of the Linux kernel did not
prevent one nft object from referencing an nft set in another nft table,
leading to a use-after-free vulnerability. A local attacker could use this
to cause a denial of service (system crash) or execute arbitrary code.
(CVE-2022-2586)

It was discovered that the block layer subsystem in the Linux kernel did
not properly initialize memory in some situations. A privileged local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2022-0494)

Hu Jiahui discovered that multiple race conditions existed in the Advanced
Linux Sound Architecture (ALSA) framework, leading to use-after-free
vulnerabilities. A local attacker could use these to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2022-1048)

It was discovered that the implementation of the 6pack and mkiss protocols
in the Linux kernel did not handle detach events properly in some
situations, leading to a use-after-free vulnerability. A local attacker
could possibly use this to cause a denial of service (system crash).
(CVE-2022-1195)

Minh Yuan discovered that the floppy disk driver in the Linux kernel
contained a race condition, leading to a use-after-free vulnerability. A
local attacker could possibly use this to cause a denial of service (system
crash) or execute arbitrary code. (CVE-2022-1652)

It was discovered that the Atheros ath9k wireless device driver in the
Linux kernel did not properly handle some error conditions, 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-2022-1679)

Norbert Slusarek discovered that a race condition existed in the perf
subsystem in the Linux kernel, resulting in a use-after-free vulnerability.
A privileged local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2022-1729)

It was discovered that the Marvell NFC device driver implementation in the
Linux kernel did not properly perform memory cleanup operations in some
situations, leading to a use-after-free vulnerability. A local attacker
could possibly use this to cause a denial of service (system crash) or
execute arbitrary code. (CVE-2022-1734)

Duoming Zhou discovered a race condition in the NFC subsystem in the Linux
kernel, leading to a use-after-free vulnerability. A privileged local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2022-1974)

Duoming Zhou discovered that the NFC subsystem in the Linux kernel did not
properly prevent context switches from occurring during certain atomic
context operations. A privileged local attacker could use this to cause a
denial of service (system crash). (CVE-2022-1975)

Minh Yuan discovered that the floppy driver in the Linux kernel contained a
race condition 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-2022-33981)

Arthur Mongodin discovered that the netfilter subsystem in the Linux kernel
did not properly perform data validation. A local attacker could use this
to escalate privileges in certain situations. (CVE-2022-34918)

Update instructions:

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

Ubuntu 18.04 LTS:
linux-image-4.15.0-1051-dell300x 4.15.0-1051.56
linux-image-4.15.0-1104-oracle 4.15.0-1104.115
linux-image-4.15.0-1117-raspi2 4.15.0-1117.125
linux-image-4.15.0-1125-kvm 4.15.0-1125.130
linux-image-4.15.0-1134-gcp 4.15.0-1134.150
linux-image-4.15.0-1135-snapdragon 4.15.0-1135.145
linux-image-4.15.0-1139-aws 4.15.0-1139.150
linux-image-4.15.0-1149-azure 4.15.0-1149.164
linux-image-4.15.0-191-generic 4.15.0-191.202
linux-image-4.15.0-191-generic-lpae 4.15.0-191.202
linux-image-4.15.0-191-lowlatency 4.15.0-191.202
linux-image-aws-lts-18.04 4.15.0.1139.139
linux-image-azure-lts-18.04 4.15.0.1149.119
linux-image-dell300x 4.15.0.1051.51
linux-image-gcp-lts-18.04 4.15.0.1134.150
linux-image-generic 4.15.0.191.176
linux-image-generic-lpae 4.15.0.191.176
linux-image-kvm 4.15.0.1125.118
linux-image-lowlatency 4.15.0.191.176
linux-image-oracle-lts-18.04 4.15.0.1104.111
linux-image-raspi2 4.15.0.1117.114
linux-image-snapdragon 4.15.0.1135.136
linux-image-virtual 4.15.0.191.176

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-5560-1
CVE-2022-0494, CVE-2022-1048, CVE-2022-1195, CVE-2022-1652,
CVE-2022-1679, CVE-2022-1729, CVE-2022-1734, CVE-2022-1974,
CVE-2022-1975, CVE-2022-2586, CVE-2022-2588, CVE-2022-33981,
CVE-2022-34918

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-191.202
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1139.150
https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1149.164
https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1051.56
https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1134.150
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1125.130
https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1104.115
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1117.125
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1135.145