==========================================================================
Ubuntu Security Notice USN-5540-1
July 28, 2022

linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities
==========================================================================

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

- 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-kvm: Linux kernel for cloud environments
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Liu Jian discovered that the IGMP protocol implementation in the Linux
kernel contained a race condition, 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-2022-20141)

It was discovered that the USB gadget subsystem in the Linux kernel did not
properly validate interface descriptor requests. An attacker could possibly
use this to cause a denial of service (system crash). (CVE-2022-25258)

It was discovered that the Remote NDIS (RNDIS) USB gadget implementation in
the Linux kernel did not properly validate the size of the RNDIS_MSG_SET
command. An attacker could possibly use this to expose sensitive
information (kernel memory). (CVE-2022-25375)

Arthur Mongodin discovered that the netfilter subsystem in the Linux kernel
did not properly perform data validation. A local attacker could use this
to escalate privileges in certain situations. (CVE-2022-34918)

Update instructions:

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

Ubuntu 16.04 ESM:
  linux-image-4.4.0-1111-kvm      4.4.0-1111.121
  linux-image-4.4.0-1146-aws      4.4.0-1146.161
  linux-image-4.4.0-230-generic   4.4.0-230.264
  linux-image-4.4.0-230-lowlatency  4.4.0-230.264
  linux-image-aws                 4.4.0.1146.150
  linux-image-generic             4.4.0.230.236
  linux-image-kvm                 4.4.0.1111.108
  linux-image-lowlatency          4.4.0.230.236
  linux-image-virtual             4.4.0.230.236

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1110-aws      4.4.0-1110.116
  linux-image-4.4.0-230-generic   4.4.0-230.264~14.04.1
  linux-image-4.4.0-230-lowlatency  4.4.0-230.264~14.04.1
  linux-image-aws                 4.4.0.1110.107
  linux-image-generic-lts-xenial  4.4.0.230.200
  linux-image-lowlatency-lts-xenial  4.4.0.230.200
  linux-image-virtual-lts-xenial  4.4.0.230.200

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-5540-1
  CVE-2022-20141, CVE-2022-25258, CVE-2022-25375, CVE-2022-34918