==========================================================================
Ubuntu Security Notice USN-5757-2
December 01, 2022

linux-aws-hwe, linux-gcp, linux-hwe, linux-oracle vulnerabilities
==========================================================================

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

- Ubuntu 16.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel
- linux-oracle: Linux kernel for Oracle Cloud systems

Details:

Jann Horn discovered that the Linux kernel did not properly track memory
allocations for anonymous VMA mappings in some situations, leading to
potential data structure reuse. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2022-42703)

It was discovered that the video4linux driver for Empia based TV cards in
the Linux kernel did not properly perform reference counting 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-2022-3239)

It was discovered that a memory leak existed in the IPv6 implementation of
the Linux kernel. A local attacker could use this to cause a denial of
service (memory exhaustion). (CVE-2022-3524)

It was discovered that a race condition existed in the Bluetooth subsystem
in the Linux kernel, 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-2022-3564)

It was discovered that the ISDN implementation of the Linux kernel
contained a use-after-free vulnerability. A privileged user could use this
to cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2022-3565)

It was discovered that the TCP implementation in the Linux kernel contained
a data race condition. An attacker could possibly use this to cause
undesired behaviors. (CVE-2022-3566)

It was discovered that the IPv6 implementation in the Linux kernel
contained a data race condition. An attacker could possibly use this to
cause undesired behaviors. (CVE-2022-3567)

It was discovered that the Realtek RTL8152 USB Ethernet adapter driver in
the Linux kernel did not properly handle certain error conditions. A local
attacker with physical access could plug in a specially crafted USB device
to cause a denial of service (memory exhaustion). (CVE-2022-3594)

It was discovered that a null pointer dereference existed in the NILFS2
file system implementation in the Linux kernel. A local attacker could use
this to cause a denial of service (system crash). (CVE-2022-3621)

Update instructions:

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

Ubuntu 16.04 ESM:
   linux-image-4.15.0-1111-oracle  4.15.0-1111.122~16.04.2
   linux-image-4.15.0-1141-gcp     4.15.0-1141.157~16.04.2
   linux-image-4.15.0-1146-aws-hwe  4.15.0-1146.158~16.04.2
   linux-image-4.15.0-200-generic  4.15.0-200.211~16.04.2
   linux-image-4.15.0-200-lowlatency  4.15.0-200.211~16.04.2
   linux-image-aws-hwe             4.15.0.1146.131
   linux-image-gcp                 4.15.0.1141.133
   linux-image-generic-hwe-16.04   4.15.0.200.185
   linux-image-gke                 4.15.0.1141.133
   linux-image-lowlatency-hwe-16.04  4.15.0.200.185
   linux-image-oem                 4.15.0.200.185
   linux-image-oracle              4.15.0.1111.93
   linux-image-virtual-hwe-16.04   4.15.0.200.185

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-5757-2
   https://ubuntu.com/security/notices/USN-5757-1
   CVE-2022-3239, CVE-2022-3524, CVE-2022-3564, CVE-2022-3565,
   CVE-2022-3566, CVE-2022-3567, CVE-2022-3594, CVE-2022-3621,
   CVE-2022-42703