==========================================================================
Ubuntu Security Notice USN-5384-1
April 20, 2022

linux, linux-aws, linux-azure, linux-azure-5.4, linux-azure-fde,
linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop,
linux-gkeop-5.4, linux-hwe-5.4, linux-ibm, linux-ibm-5.4, linux-kvm,
linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4
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-gcp: Linux kernel for Google Cloud Platform (GCP) 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-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems
- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke-5.4: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop-5.4: Linux kernel for Google Container Engine (GKE) systems
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel
- linux-ibm-5.4: Linux kernel for IBM cloud systems
- linux-oracle-5.4: Linux kernel for Oracle Cloud systems
- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

Details:

It was discovered that the UDF file system implementation in the Linux
kernel could attempt to dereference a null pointer in some situations. An
attacker could use this to construct a malicious UDF image that, when
mounted and operated on, could cause a denial of service (system crash).
(CVE-2022-0617)

Lyu Tao discovered that the NFS implementation in the Linux kernel did not
properly handle requests to open a directory on a regular file. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2022-24448)

It was discovered that the YAM AX.25 device driver in the Linux kernel did
not properly deallocate memory in some error conditions. A local privileged
attacker could use this to cause a denial of service (kernel memory
exhaustion). (CVE-2022-24959)

Update instructions:

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

Ubuntu 20.04 LTS:
  linux-image-5.4.0-1020-ibm      5.4.0-1020.22
  linux-image-5.4.0-1039-gkeop    5.4.0-1039.40
  linux-image-5.4.0-1059-raspi    5.4.0-1059.67
  linux-image-5.4.0-1062-kvm      5.4.0-1062.65
  linux-image-5.4.0-1068-gke      5.4.0-1068.71
  linux-image-5.4.0-1070-oracle   5.4.0-1070.76
  linux-image-5.4.0-1072-aws      5.4.0-1072.77
  linux-image-5.4.0-1072-gcp      5.4.0-1072.77
  linux-image-5.4.0-1076-azure-fde  5.4.0-1076.79+cvm1.1
  linux-image-5.4.0-1077-azure    5.4.0-1077.80
  linux-image-5.4.0-109-generic   5.4.0-109.123
  linux-image-5.4.0-109-generic-lpae  5.4.0-109.123
  linux-image-5.4.0-109-lowlatency  5.4.0-109.123
  linux-image-aws-lts-20.04       5.4.0.1072.74
  linux-image-azure-fde           5.4.0.1076.79+cvm1.21
  linux-image-azure-lts-20.04     5.4.0.1077.75
  linux-image-gcp-lts-20.04       5.4.0.1072.80
  linux-image-generic             5.4.0.109.113
  linux-image-generic-lpae        5.4.0.109.113
  linux-image-gke                 5.4.0.1068.78
  linux-image-gke-5.4             5.4.0.1068.78
  linux-image-gkeop               5.4.0.1039.42
  linux-image-gkeop-5.4           5.4.0.1039.42
  linux-image-ibm                 5.4.0.1020.20
  linux-image-ibm-lts-20.04       5.4.0.1020.20
  linux-image-kvm                 5.4.0.1062.61
  linux-image-lowlatency          5.4.0.109.113
  linux-image-oem                 5.4.0.109.113
  linux-image-oem-osp1            5.4.0.109.113
  linux-image-oracle-lts-20.04    5.4.0.1070.70
  linux-image-raspi               5.4.0.1059.93
  linux-image-raspi2              5.4.0.1059.93
  linux-image-virtual             5.4.0.109.113

Ubuntu 18.04 LTS:
  linux-image-5.4.0-1020-ibm      5.4.0-1020.22~18.04.1
  linux-image-5.4.0-1039-gkeop    5.4.0-1039.40~18.04.1
  linux-image-5.4.0-1059-raspi    5.4.0-1059.66~18.04.1
  linux-image-5.4.0-1068-gke      5.4.0-1068.71~18.04.1
  linux-image-5.4.0-1070-oracle   5.4.0-1070.76~18.04.1
  linux-image-5.4.0-1072-gcp      5.4.0-1072.77~18.04.1
  linux-image-5.4.0-1077-azure    5.4.0-1077.80~18.04.1
  linux-image-5.4.0-109-generic   5.4.0-109.123~18.04.1
  linux-image-5.4.0-109-generic-lpae  5.4.0-109.123~18.04.1
  linux-image-5.4.0-109-lowlatency  5.4.0-109.123~18.04.1
  linux-image-azure               5.4.0.1077.56
  linux-image-gcp                 5.4.0.1072.56
  linux-image-generic-hwe-18.04   5.4.0.109.123~18.04.94
  linux-image-generic-lpae-hwe-18.04  5.4.0.109.123~18.04.94
  linux-image-gke-5.4             5.4.0.1068.71~18.04.32
  linux-image-gkeop-5.4           5.4.0.1039.40~18.04.39
  linux-image-ibm                 5.4.0.1020.37
  linux-image-lowlatency-hwe-18.04  5.4.0.109.123~18.04.94
  linux-image-oem                 5.4.0.109.123~18.04.94
  linux-image-oem-osp1            5.4.0.109.123~18.04.94
  linux-image-oracle              5.4.0.1070.76~18.04.49
  linux-image-raspi-hwe-18.04     5.4.0.1059.60
  linux-image-snapdragon-hwe-18.04  5.4.0.109.123~18.04.94
  linux-image-virtual-hwe-18.04   5.4.0.109.123~18.04.94

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-5384-1
  CVE-2022-0617, CVE-2022-24448, CVE-2022-24959

Package Information:
  https://launchpad.net/ubuntu/+source/linux/5.4.0-109.123
  https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1072.77
  https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1077.80
  https://launchpad.net/ubuntu/+source/linux-azure-fde/5.4.0-1076.79+cvm1.1
  https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1072.77
  https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1068.71
  https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1039.40
  https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1020.22
  https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1062.65
  https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1070.76
  https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1059.67
  https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1077.80~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1072.77~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1068.71~18.04.1
  https://launchpad.net/ubuntu/+source/linux-gkeop-5.4/5.4.0-1039.40~18.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-109.123~18.04.1
  https://launchpad.net/ubuntu/+source/linux-ibm-5.4/5.4.0-1020.22~18.04.1
  https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1070.76~18.04.1
  https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1059.66~18.04.1