==========================================================================
Ubuntu Security Notice USN-5466-1
June 08, 2022

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp,
linux-hwe, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon
vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

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-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi2: Linux kernel for Raspberry Pi systems
- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

It was discovered that the Linux kernel did not properly restrict access to
the kernel debugger when booted in secure boot environments. A privileged
attacker could use this to bypass UEFI Secure Boot restrictions.
(CVE-2022-21499)

Aaron Adams discovered that the netfilter subsystem in the Linux kernel did
not properly handle the removal of stateful expressions 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 execute arbitrary code.
(CVE-2022-1966)

It was discovered that the SCTP protocol implementation in the Linux kernel
did not properly verify VTAGs in some situations. A remote attacker could
possibly use this to cause a denial of service (connection disassociation).
(CVE-2021-3772)

It was discovered that the btrfs file system implementation in the Linux
kernel did not properly handle locking in certain error conditions. A local
attacker could use this to cause a denial of service (kernel deadlock).
(CVE-2021-4149)

David Bouman discovered that the netfilter subsystem in the Linux kernel
did not initialize memory in some situations. A local attacker could use
this to expose sensitive information (kernel memory). (CVE-2022-1016)

It was discovered that the virtual graphics memory manager implementation
in the Linux kernel was subject to a race condition, potentially leading to
an information leak. (CVE-2022-1419)

赵子轩 discovered that the 802.2 LLC type 2 driver in the Linux kernel did not
properly perform reference counting in some error conditions. A local
attacker could use this to cause a denial of service. (CVE-2022-28356)

It was discovered that the EMS CAN/USB interface implementation in the
Linux kernel contained a double-free vulnerability when handling certain
error conditions. A local attacker could use this to cause a denial of
service (memory exhaustion). (CVE-2022-28390)

Update instructions:

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

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1098-oracle  4.15.0-1098.108
  linux-image-4.15.0-1114-raspi2  4.15.0-1114.122
  linux-image-4.15.0-1119-kvm     4.15.0-1119.123
  linux-image-4.15.0-1132-snapdragon  4.15.0-1132.142
  linux-image-4.15.0-1133-aws     4.15.0-1133.143
  linux-image-4.15.0-1142-azure   4.15.0-1142.156
  linux-image-4.15.0-184-generic  4.15.0-184.194
  linux-image-4.15.0-184-generic-lpae  4.15.0-184.194
  linux-image-4.15.0-184-lowlatency  4.15.0-184.194
  linux-image-aws-lts-18.04       4.15.0.1133.135
  linux-image-azure-lts-18.04     4.15.0.1142.114
  linux-image-generic             4.15.0.184.172
  linux-image-generic-lpae        4.15.0.184.172
  linux-image-kvm                 4.15.0.1119.114
  linux-image-lowlatency          4.15.0.184.172
  linux-image-oracle-lts-18.04    4.15.0.1098.107
  linux-image-raspi2              4.15.0.1114.111
  linux-image-snapdragon          4.15.0.1132.133
  linux-image-virtual             4.15.0.184.172

Ubuntu 16.04 ESM:
  linux-image-4.15.0-1098-oracle  4.15.0-1098.108~16.04.1
  linux-image-4.15.0-1127-gcp     4.15.0-1127.142~16.04.1
  linux-image-4.15.0-1133-aws-hwe  4.15.0-1133.143~16.04.1
  linux-image-4.15.0-1142-azure   4.15.0-1142.156~16.04.1
  linux-image-4.15.0-184-generic  4.15.0-184.194~16.04.1
  linux-image-4.15.0-184-lowlatency  4.15.0-184.194~16.04.1
  linux-image-aws-hwe             4.15.0.1133.122
  linux-image-azure               4.15.0.1142.131
  linux-image-gcp                 4.15.0.1127.126
  linux-image-generic-hwe-16.04   4.15.0.184.173
  linux-image-gke                 4.15.0.1127.126
  linux-image-lowlatency-hwe-16.04  4.15.0.184.173
  linux-image-oem                 4.15.0.184.173
  linux-image-oracle              4.15.0.1098.85
  linux-image-virtual-hwe-16.04   4.15.0.184.173

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1142-azure   4.15.0-1142.156~14.04.1
  linux-image-azure               4.15.0.1142.113

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-5466-1
  CVE-2021-3772, CVE-2021-4149, CVE-2022-1016, CVE-2022-1419,
  CVE-2022-1966, CVE-2022-21499, CVE-2022-28356, CVE-2022-28390

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-184.194
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1133.143
  https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1142.156
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1119.123
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1098.108
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1114.122
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1132.142