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

USN-5514-1: Linux kernel vulnerabilities

=========================================================================
Ubuntu Security Notice USN-5514-1
July 13, 2022

linux, linux-aws, linux-azure, linux-azure-5.4, linux-azure-fde,
linux-gke, linux-gkeop, linux-hwe-5.4, linux-ibm, linux-kvm
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-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-azure-fde: Linux kernel for Microsoft Azure cloud systems
- 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-azure-5.4: Linux kernel for Microsoft Azure cloud systems
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel

Details:

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)

Duoming Zhou discovered that the AX.25 amateur radio protocol
implementation in the Linux kernel did not handle detach events properly in
some situations. A local attacker could possibly use this to cause a denial
of service (system crash) or execute arbitrary code. (CVE-2022-1199)

Duoming Zhou discovered race conditions in the AX.25 amateur radio protocol
implementation in the Linux kernel during device detach operations. A local
attacker could possibly use this to cause a denial of service (system
crash). (CVE-2022-1204)

Duoming Zhou discovered race conditions in the AX.25 amateur radio protocol
implementation in the Linux kernel, leading to use-after-free
vulnerabilities. A local attacker could possibly use this to cause a denial
of service (system crash). (CVE-2022-1205)

Yongkang Jia discovered that the KVM hypervisor implementation in the Linux
kernel did not properly handle guest TLB mapping invalidation requests in
some situations. An attacker in a guest VM could use this to cause a denial
of service in the host OS (system crash). (CVE-2022-1789)

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)

Update instructions:

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

Ubuntu 20.04 LTS:
linux-image-5.4.0-1029-ibm 5.4.0-1029.33
linux-image-5.4.0-1049-gkeop 5.4.0-1049.52
linux-image-5.4.0-1071-kvm 5.4.0-1071.76
linux-image-5.4.0-1078-gke 5.4.0-1078.84
linux-image-5.4.0-1081-aws 5.4.0-1081.88
linux-image-5.4.0-1086-azure 5.4.0-1086.91
linux-image-5.4.0-1086-azure-fde 5.4.0-1086.91+cvm1.1
linux-image-5.4.0-122-generic 5.4.0-122.138
linux-image-5.4.0-122-generic-lpae 5.4.0-122.138
linux-image-5.4.0-122-lowlatency 5.4.0-122.138
linux-image-aws-lts-20.04 5.4.0.1081.81
linux-image-azure-fde 5.4.0.1086.91+cvm1.27
linux-image-azure-lts-20.04 5.4.0.1086.83
linux-image-generic 5.4.0.122.123
linux-image-generic-lpae 5.4.0.122.123
linux-image-gke 5.4.0.1078.86
linux-image-gke-5.4 5.4.0.1078.86
linux-image-gkeop 5.4.0.1049.50
linux-image-gkeop-5.4 5.4.0.1049.50
linux-image-ibm 5.4.0.1029.58
linux-image-ibm-lts-20.04 5.4.0.1029.58
linux-image-kvm 5.4.0.1071.68
linux-image-lowlatency 5.4.0.122.123
linux-image-oem 5.4.0.122.123
linux-image-oem-osp1 5.4.0.122.123
linux-image-virtual 5.4.0.122.123

Ubuntu 18.04 LTS:
linux-image-5.4.0-1086-azure 5.4.0-1086.91~18.04.1
linux-image-5.4.0-122-generic 5.4.0-122.138~18.04.1
linux-image-5.4.0-122-generic-lpae 5.4.0-122.138~18.04.1
linux-image-5.4.0-122-lowlatency 5.4.0-122.138~18.04.1
linux-image-azure 5.4.0.1086.63
linux-image-generic-hwe-18.04 5.4.0.122.138~18.04.102
linux-image-generic-lpae-hwe-18.04 5.4.0.122.138~18.04.102
linux-image-lowlatency-hwe-18.04 5.4.0.122.138~18.04.102
linux-image-oem 5.4.0.122.138~18.04.102
linux-image-oem-osp1 5.4.0.122.138~18.04.102
linux-image-snapdragon-hwe-18.04 5.4.0.122.138~18.04.102
linux-image-virtual-hwe-18.04 5.4.0.122.138~18.04.102

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-5514-1
CVE-2022-1195, CVE-2022-1199, CVE-2022-1204, CVE-2022-1205,
CVE-2022-1789, CVE-2022-33981

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.4.0-122.138
  https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1081.88
  https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1086.91
  https://launchpad.net/ubuntu/+source/linux-azure-fde/5.4.0-1086.91+cvm1.1
  https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1078.84
  https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1049.52
  https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1029.33
  https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1071.76
  https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1086.91~18.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-122.138~18.04.1