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

USN-5729-2: Linux kernel vulnerabilities

=========================================================================
Ubuntu Security Notice USN-5729-2
November 18, 2022

linux-gcp-5.15, linux-gke-5.15, linux-intel-iotg, linux-raspi
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-intel-iotg: Linux kernel for Intel IoT platforms
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-gcp-5.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke-5.15: Linux kernel for Google Container Engine (GKE) systems

Details:

It was discovered that a race condition existed in the instruction emulator
of the Linux kernel on Arm 64-bit systems. A local attacker could use this
to cause a denial of service (system crash). (CVE-2022-20422)

Hsin-Wei Hung discovered that the BPF subsystem in the Linux kernel
contained an out-of-bounds read vulnerability in the x86 JIT compiler. A
local attacker could possibly use this to cause a denial of service (system
crash) or expose sensitive information (kernel memory). (CVE-2022-2905)

Hao Sun and Jiacheng Xu discovered that the NILFS file system
implementation in the Linux kernel contained 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-2022-2978)

Abhishek Shah discovered a race condition in the PF_KEYv2 implementation in
the Linux kernel. A local attacker could use this to cause a denial of
service (system crash) or possibly expose sensitive information (kernel
memory). (CVE-2022-3028)

It was discovered that the Netlink device interface implementation in the
Linux kernel did not properly handle certain error conditions, leading to a
use-after-free vulnerability with some network device drivers. A local
attacker with admin access to the network device could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2022-3625)

It was discovered that the IDT 77252 ATM PCI device driver in the Linux
kernel did not properly remove any pending timers during device exit,
resulting in 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-2022-3635)

Gwangun Jung discovered that the netfilter subsystem in the Linux kernel
did not properly prevent binding to an already bound chain. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2022-39190)

Xingyuan Mo and Gengjia Chen discovered that the Promise SuperTrak EX
storage controller driver in the Linux kernel did not properly handle
certain structures. A local attacker could potentially use this to expose
sensitive information (kernel memory). (CVE-2022-40768)

Update instructions:

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

Ubuntu 22.04 LTS:
linux-image-5.15.0-1018-intel-iotg 5.15.0-1018.23
linux-image-5.15.0-1018-raspi 5.15.0-1018.20
linux-image-5.15.0-1018-raspi-nolpae 5.15.0-1018.20
linux-image-intel-iotg 5.15.0.1018.19
linux-image-raspi 5.15.0.1018.17
linux-image-raspi-nolpae 5.15.0.1018.17

Ubuntu 20.04 LTS:
linux-image-5.15.0-1020-gke 5.15.0-1020.25~20.04.1
linux-image-5.15.0-1022-gcp 5.15.0-1022.29~20.04.1
linux-image-gcp 5.15.0.1022.29~20.04.1
linux-image-gke-5.15 5.15.0.1020.25~20.04.1

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-5729-2
  https://ubuntu.com/security/notices/USN-5729-1
CVE-2022-20422, CVE-2022-2905, CVE-2022-2978, CVE-2022-3028,
CVE-2022-3625, CVE-2022-3635, CVE-2022-39190, CVE-2022-40768

Package Information:
  https://launchpad.net/ubuntu/+source/linux-intel-iotg/5.15.0-1018.23
  https://launchpad.net/ubuntu/+source/linux-raspi/5.15.0-1018.20
  https://launchpad.net/ubuntu/+source/linux-gcp-5.15/5.15.0-1022.29~20.04.1
  https://launchpad.net/ubuntu/+source/linux-gke-5.15/5.15.0-1020.25~20.04.1