A Linux kernel security update has been released for Ubuntu Linux 14.04 ESM, 16.04 ESM, and 18.04 LTS.

USN-5385-1: Linux kernel vulnerabilities

=========================================================================
Ubuntu Security Notice USN-5385-1
April 21, 2022

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15,
linux-dell300x, linux-gcp, inux-gcp-4.15, linux-hwe, linux-kvm,
linux-oracle, 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-dell300x: Linux kernel for Dell 300x platforms
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud 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:

Brendan Dolan-Gavitt discovered that the aQuantia AQtion Ethernet device
driver in the Linux kernel did not properly validate meta-data coming from
the device. A local attacker who can control an emulated device can use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2021-43975)

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 18.04 LTS:
linux-image-4.15.0-1041-dell300x 4.15.0-1041.46
linux-image-4.15.0-1092-oracle 4.15.0-1092.101
linux-image-4.15.0-1113-kvm 4.15.0-1113.116
linux-image-4.15.0-1121-gcp 4.15.0-1121.135
linux-image-4.15.0-1126-snapdragon 4.15.0-1126.135
linux-image-4.15.0-1127-aws 4.15.0-1127.136
linux-image-4.15.0-1137-azure 4.15.0-1137.150
linux-image-4.15.0-176-generic 4.15.0-176.185
linux-image-4.15.0-176-generic-lpae 4.15.0-176.185
linux-image-4.15.0-176-lowlatency 4.15.0-176.185
linux-image-aws-lts-18.04 4.15.0.1127.130
linux-image-azure-lts-18.04 4.15.0.1137.110
linux-image-dell300x 4.15.0.1041.43
linux-image-gcp-lts-18.04 4.15.0.1121.140
linux-image-generic 4.15.0.176.165
linux-image-generic-lpae 4.15.0.176.165
linux-image-kvm 4.15.0.1113.109
linux-image-lowlatency 4.15.0.176.165
linux-image-oracle-lts-18.04 4.15.0.1092.102
linux-image-snapdragon 4.15.0.1126.129
linux-image-virtual 4.15.0.176.165

Ubuntu 16.04 ESM:
linux-image-4.15.0-1092-oracle 4.15.0-1092.101~16.04.1
linux-image-4.15.0-1121-gcp 4.15.0-1121.135~16.04.1
linux-image-4.15.0-1127-aws-hwe 4.15.0-1127.136~16.04.1
linux-image-4.15.0-1137-azure 4.15.0-1137.150~16.04.1
linux-image-4.15.0-176-generic 4.15.0-176.185~16.04.1
linux-image-4.15.0-176-lowlatency 4.15.0-176.185~16.04.1
linux-image-aws-hwe 4.15.0.1127.117
linux-image-azure 4.15.0.1137.127
linux-image-gcp 4.15.0.1121.122
linux-image-generic-hwe-16.04 4.15.0.176.168
linux-image-gke 4.15.0.1121.122
linux-image-lowlatency-hwe-16.04 4.15.0.176.168
linux-image-oem 4.15.0.176.168
linux-image-oracle 4.15.0.1092.80
linux-image-virtual-hwe-16.04 4.15.0.176.168

Ubuntu 14.04 ESM:
linux-image-4.15.0-1137-azure 4.15.0-1137.150~14.04.1
linux-image-azure 4.15.0.1137.109

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-5385-1
CVE-2021-43975, CVE-2022-0617, CVE-2022-24448, CVE-2022-24959

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-176.185
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1127.136
  https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1137.150
  https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1041.46
  https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1121.135
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1113.116
  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1092.101
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1126.135