A Linux kernel security update has been released for Ubuntu Linux 20.04 LTS and 22.04 LTS.

USN-5544-1: Linux kernel vulnerabilities

=========================================================================
Ubuntu Security Notice USN-5544-1
August 02, 2022

linux, linux-hwe-5.15, linux-lowlatency, linux-lowlatency-hwe-5.15
vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-lowlatency: Linux low latency kernel
- linux-hwe-5.15: Linux hardware enablement (HWE) kernel
- linux-lowlatency-hwe-5.15: Linux low latency kernel

Details:

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)

Felix Fu discovered that the Sun RPC implementation in the Linux kernel did
not properly handle socket states, leading to a use-after-free
vulnerability. A remote attacker could possibly use this to cause a denial
of service (system crash) or execute arbitrary code. (CVE-2022-28893)

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)

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)

Update instructions:

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

Ubuntu 22.04 LTS:
linux-image-5.15.0-43-generic 5.15.0-43.46
linux-image-5.15.0-43-generic-64k 5.15.0-43.46
linux-image-5.15.0-43-generic-lpae 5.15.0-43.46
linux-image-5.15.0-43-lowlatency 5.15.0-43.46
linux-image-5.15.0-43-lowlatency-64k 5.15.0-43.46
linux-image-generic 5.15.0.43.44
linux-image-generic-64k 5.15.0.43.44
linux-image-generic-64k-hwe-22.04 5.15.0.43.44
linux-image-generic-hwe-22.04 5.15.0.43.44
linux-image-generic-lpae 5.15.0.43.44
linux-image-generic-lpae-hwe-22.04 5.15.0.43.44
linux-image-lowlatency 5.15.0.43.41
linux-image-lowlatency-64k 5.15.0.43.41
linux-image-lowlatency-64k-hwe-22.04 5.15.0.43.41
linux-image-lowlatency-hwe-22.04 5.15.0.43.41
linux-image-oem-20.04 5.15.0.43.44
linux-image-virtual 5.15.0.43.44
linux-image-virtual-hwe-22.04 5.15.0.43.44

Ubuntu 20.04 LTS:
linux-image-5.15.0-43-generic 5.15.0-43.46~20.04.1
linux-image-5.15.0-43-generic-64k 5.15.0-43.46~20.04.1
linux-image-5.15.0-43-generic-lpae 5.15.0-43.46~20.04.1
linux-image-5.15.0-43-lowlatency 5.15.0-43.46~20.04.1
linux-image-5.15.0-43-lowlatency-64k 5.15.0-43.46~20.04.1
linux-image-generic-64k-hwe-20.04 5.15.0.43.46~20.04.14
linux-image-generic-hwe-20.04 5.15.0.43.46~20.04.14
linux-image-generic-lpae-hwe-20.04 5.15.0.43.46~20.04.14
linux-image-lowlatency-64k-hwe-20.04 5.15.0.43.46~20.04.13
linux-image-lowlatency-hwe-20.04 5.15.0.43.46~20.04.13
linux-image-virtual-hwe-20.04 5.15.0.43.46~20.04.14

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-5544-1
CVE-2022-1652, CVE-2022-1679, CVE-2022-28893, CVE-2022-34918

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.15.0-43.46
  https://launchpad.net/ubuntu/+source/linux-lowlatency/5.15.0-43.46
  https://launchpad.net/ubuntu/+source/linux-hwe-5.15/5.15.0-43.46~20.04.1
  https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-5.15/5.15.0-43.46~20.04.1