==========================================================================
Ubuntu Security Notice USN-6149-1
June 08, 2023

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

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

- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)

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:

Patryk Sondej and Piotr Krysiuk discovered that a race condition existed in
the netfilter subsystem of the Linux kernel when processing batch requests,
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-2023-32233)

Gwangun Jung discovered that the Quick Fair Queueing scheduler
implementation in the Linux kernel contained an out-of-bounds write
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2023-31436)

Reima Ishii discovered that the nested KVM implementation for Intel x86
processors in the Linux kernel did not properly validate control registers
in certain situations. An attacker in a guest VM could use this to cause a
denial of service (guest crash). (CVE-2023-30456)

It was discovered that the Broadcom FullMAC USB WiFi driver in the Linux
kernel did not properly perform data buffer size validation in some
situations. A physically proximate attacker could use this to craft a
malicious USB device that when inserted, could cause a denial of service
(system crash) or possibly expose sensitive information. (CVE-2023-1380)

It was discovered that the Human Interface Device (HID) support driver in
the Linux kernel contained a type confusion vulnerability in some
situations. A local attacker could use this to cause a denial of service
(system crash). (CVE-2023-1073)

Wei Chen discovered that the DVB USB AZ6027 driver in the Linux kernel
contained a null pointer dereference when handling certain messages from
user space. A local attacker could use this to cause a denial of service
(system crash). (CVE-2023-28328)

Update instructions:

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

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-1120-kvm      4.4.0-1120.130
   linux-image-4.4.0-1157-aws      4.4.0-1157.172
   linux-image-4.4.0-241-generic   4.4.0-241.275
   linux-image-4.4.0-241-lowlatency  4.4.0-241.275
   linux-image-aws                 4.4.0.1157.161
   linux-image-generic             4.4.0.241.247
   linux-image-generic-lts-xenial  4.4.0.241.247
   linux-image-kvm                 4.4.0.1120.117
   linux-image-lowlatency          4.4.0.241.247
   linux-image-lowlatency-lts-xenial  4.4.0.241.247
   linux-image-virtual             4.4.0.241.247
   linux-image-virtual-lts-xenial  4.4.0.241.247

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   linux-image-4.4.0-1119-aws      4.4.0-1119.125
   linux-image-4.4.0-241-generic   4.4.0-241.275~14.04.1
   linux-image-4.4.0-241-lowlatency  4.4.0-241.275~14.04.1
   linux-image-aws                 4.4.0.1119.116
   linux-image-generic-lts-xenial  4.4.0.241.209
   linux-image-lowlatency-lts-xenial  4.4.0.241.209
   linux-image-virtual-lts-xenial  4.4.0.241.209

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-6149-1
   CVE-2023-1073, CVE-2023-1380, CVE-2023-28328, CVE-2023-30456,
   CVE-2023-31436, CVE-2023-32233