A Linux kernel security update has been released for Ubuntu Linux 18.04 LTS and 20.04 LTS.

USN-5668-1: Linux kernel vulnerabilities

==========================================================================
Ubuntu Security Notice USN-5668-1
October 10, 2022

linux, linux-aws, linux-bluefield, linux-gke, linux-gkeop, linux-hwe-5.4,
linux-ibm, linux-ibm-5.4, linux-kvm, linux-oracle vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS
- 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-bluefield: Linux kernel for NVIDIA BlueField platforms
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-ibm: Linux kernel for IBM cloud systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel
- linux-ibm-5.4: Linux kernel for IBM cloud systems

Details:

It was discovered that the BPF verifier in the Linux kernel did not
properly handle internal data structures. A local attacker could use this
to expose sensitive information (kernel memory). (CVE-2021-4159)

It was discovered that an out-of-bounds write vulnerability existed in the
Video for Linux 2 (V4L2) implementation in the Linux kernel. A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2022-20369)

Duoming Zhou discovered that race conditions existed in the timer handling
implementation of the Linux kernel's Rose X.25 protocol layer, resulting in
use-after-free vulnerabilities. A local attacker could use this to cause a
denial of service (system crash). (CVE-2022-2318)

Roger Pau Monné discovered that the Xen virtual block driver in the Linux
kernel did not properly initialize memory pages to be used for shared
communication with the backend. A local attacker could use this to expose
sensitive information (guest kernel memory). (CVE-2022-26365)

Pawan Kumar Gupta, Alyssa Milburn, Amit Peled, Shani Rehana, Nir Shildan
and Ariel Sabba discovered that some Intel processors with Enhanced
Indirect Branch Restricted Speculation (eIBRS) did not properly handle RET
instructions after a VM exits. A local attacker could potentially use this
to expose sensitive information. (CVE-2022-26373)

Eric Biggers discovered that a use-after-free vulnerability existed in the
io_uring subsystem 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-2022-3176)

Roger Pau Monné discovered that the Xen paravirtualization frontend in the
Linux kernel did not properly initialize memory pages to be used for shared
communication with the backend. A local attacker could use this to expose
sensitive information (guest kernel memory). (CVE-2022-33740)

It was discovered that the Xen paravirtualization frontend in the Linux
kernel incorrectly shared unrelated data when communicating with certain
backends. A local attacker could use this to cause a denial of service
(guest crash) or expose sensitive information (guest kernel memory).
(CVE-2022-33741, CVE-2022-33742)

Oleksandr Tyshchenko discovered that the Xen paravirtualization platform in
the Linux kernel on ARM platforms contained a race condition in certain
situations. An attacker in a guest VM could use this to cause a denial of
service in the host OS. (CVE-2022-33744)

It was discovered that the Netlink Transformation (XFRM) subsystem in the
Linux kernel contained a reference counting error. A local attacker could
use this to cause a denial of service (system crash). (CVE-2022-36879)

Update instructions:

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

Ubuntu 20.04 LTS:
linux-image-5.4.0-1034-ibm 5.4.0-1034.38
linux-image-5.4.0-1047-bluefield 5.4.0-1047.52
linux-image-5.4.0-1054-gkeop 5.4.0-1054.57
linux-image-5.4.0-1076-kvm 5.4.0-1076.81
linux-image-5.4.0-1084-gke 5.4.0-1084.90
linux-image-5.4.0-1084-oracle 5.4.0-1084.92
linux-image-5.4.0-1086-aws 5.4.0-1086.93
linux-image-5.4.0-128-generic 5.4.0-128.144
linux-image-5.4.0-128-generic-lpae 5.4.0-128.144
linux-image-5.4.0-128-lowlatency 5.4.0-128.144
linux-image-aws-lts-20.04 5.4.0.1086.86
linux-image-bluefield 5.4.0.1047.46
linux-image-generic 5.4.0.128.129
linux-image-generic-lpae 5.4.0.128.129
linux-image-gke 5.4.0.1084.92
linux-image-gke-5.4 5.4.0.1084.92
linux-image-gkeop 5.4.0.1054.55
linux-image-gkeop-5.4 5.4.0.1054.55
linux-image-ibm 5.4.0.1034.63
linux-image-ibm-lts-20.04 5.4.0.1034.63
linux-image-kvm 5.4.0.1076.73
linux-image-lowlatency 5.4.0.128.129
linux-image-oem 5.4.0.128.129
linux-image-oem-osp1 5.4.0.128.129
linux-image-oracle-lts-20.04 5.4.0.1084.81
linux-image-virtual 5.4.0.128.129

Ubuntu 18.04 LTS:
linux-image-5.4.0-1034-ibm 5.4.0-1034.38~18.04.1
linux-image-5.4.0-128-generic 5.4.0-128.144~18.04.1
linux-image-5.4.0-128-generic-lpae 5.4.0-128.144~18.04.1
linux-image-5.4.0-128-lowlatency 5.4.0-128.144~18.04.1
linux-image-generic-hwe-18.04 5.4.0.128.144~18.04.107
linux-image-generic-lpae-hwe-18.04 5.4.0.128.144~18.04.107
linux-image-ibm 5.4.0.1034.48
linux-image-lowlatency-hwe-18.04 5.4.0.128.144~18.04.107
linux-image-oem 5.4.0.128.144~18.04.107
linux-image-oem-osp1 5.4.0.128.144~18.04.107
linux-image-snapdragon-hwe-18.04 5.4.0.128.144~18.04.107
linux-image-virtual-hwe-18.04 5.4.0.128.144~18.04.107

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-5668-1
CVE-2021-4159, CVE-2022-20369, CVE-2022-2318, CVE-2022-26365,
CVE-2022-26373, CVE-2022-3176, CVE-2022-33740, CVE-2022-33741,
CVE-2022-33742, CVE-2022-33744, CVE-2022-36879

Package Information:
https://launchpad.net/ubuntu/+source/linux/5.4.0-128.144
https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1086.93
https://launchpad.net/ubuntu/+source/linux-bluefield/5.4.0-1047.52
https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1084.90
https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1054.57
https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1034.38
https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1076.81
https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1084.92
https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-128.144~18.04.1
https://launchpad.net/ubuntu/+source/linux-ibm-5.4/5.4.0-1034.38~18.04.1