==========================================================================
Ubuntu Security Notice USN-6340-1
September 05, 2023

linux, linux-aws, linux-aws-5.4, linux-gcp, linux-hwe-5.4, linux-ibm,
linux-iot, linux-kvm, linux-oracle, linux-oracle-5.4 vulnerabilities
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-ibm: Linux kernel for IBM cloud systems
- linux-iot: Linux kernel for IoT platforms
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel
- linux-oracle-5.4: Linux kernel for Oracle Cloud systems

Details:

Ruihan Li discovered that the bluetooth subsystem in the Linux kernel did
not properly perform permissions checks when handling HCI sockets. A
physically proximate attacker could use this to cause a denial of service
(bluetooth communication). (CVE-2023-2002)

Zi Fan Tan discovered that the binder IPC implementation in the Linux
kernel contained 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-2023-21255)

Juan Jose Lopez Jaimez, Meador Inge, Simon Scannell, and Nenad Stojanovski
discovered that the BPF verifier in the Linux kernel did not properly mark
registers for precision tracking in certain situations, leading to an out-
of-bounds access vulnerability. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2023-2163)

Zheng Zhang discovered that the device-mapper implementation in the Linux
kernel did not properly handle locking during table_clear() operations. A
local attacker could use this to cause a denial of service (kernel
deadlock). (CVE-2023-2269)

It was discovered that the DVB Core driver in the Linux kernel did not
properly handle locking events in certain situations. A local attacker
could use this to cause a denial of service (kernel deadlock).
(CVE-2023-31084)

It was discovered that the kernel->user space relay implementation in the
Linux kernel did not properly perform certain buffer calculations, leading
to an out-of-bounds read vulnerability. A local attacker could use this to
cause a denial of service (system crash) or expose sensitive information
(kernel memory). (CVE-2023-3268)

It was discovered that the video4linux driver for Philips based TV cards in
the Linux kernel contained a race condition during device removal, leading
to a use-after-free vulnerability. A physically proximate attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2023-35823)

It was discovered that the SDMC DM1105 PCI device driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2023-35824)

It was discovered that the Renesas USB controller driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A privileged attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2023-35828)

Update instructions:

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1021-iot      5.4.0-1021.22
   linux-image-5.4.0-1056-ibm      5.4.0-1056.61
   linux-image-5.4.0-1098-kvm      5.4.0-1098.104
   linux-image-5.4.0-1108-oracle   5.4.0-1108.117
   linux-image-5.4.0-1109-aws      5.4.0-1109.118
   linux-image-5.4.0-1112-gcp      5.4.0-1112.121
   linux-image-5.4.0-162-generic   5.4.0-162.179
   linux-image-5.4.0-162-generic-lpae  5.4.0-162.179
   linux-image-5.4.0-162-lowlatency  5.4.0-162.179
   linux-image-aws-lts-20.04       5.4.0.1109.106
   linux-image-gcp-lts-20.04       5.4.0.1112.114
   linux-image-generic             5.4.0.162.159
   linux-image-generic-lpae        5.4.0.162.159
   linux-image-ibm-lts-20.04       5.4.0.1056.85
   linux-image-kvm                 5.4.0.1098.93
   linux-image-lowlatency          5.4.0.162.159
   linux-image-oem                 5.4.0.162.159
   linux-image-oem-osp1            5.4.0.162.159
   linux-image-oracle-lts-20.04    5.4.0.1108.101
   linux-image-virtual             5.4.0.162.159

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-5.4.0-1108-oracle   5.4.0-1108.117~18.04.1
   linux-image-5.4.0-1109-aws      5.4.0-1109.118~18.04.1
   linux-image-5.4.0-162-generic   5.4.0-162.179~18.04.1
   linux-image-5.4.0-162-lowlatency  5.4.0-162.179~18.04.1
   linux-image-aws                 5.4.0.1109.87
   linux-image-generic-hwe-18.04   5.4.0.162.179~18.04.129
   linux-image-lowlatency-hwe-18.04  5.4.0.162.179~18.04.129
   linux-image-oem                 5.4.0.162.179~18.04.129
   linux-image-oem-osp1            5.4.0.162.179~18.04.129
   linux-image-oracle              5.4.0.1108.117~18.04.80
   linux-image-snapdragon-hwe-18.04  5.4.0.162.179~18.04.129
   linux-image-virtual-hwe-18.04   5.4.0.162.179~18.04.129

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-6340-1
   CVE-2023-2002, CVE-2023-21255, CVE-2023-2163, CVE-2023-2269,
   CVE-2023-31084, CVE-2023-3268, CVE-2023-35823, CVE-2023-35824,
   CVE-2023-35828

Package Information:
   https://launchpad.net/ubuntu/+source/linux/5.4.0-162.179
   https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1109.118
   https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1112.121
   https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1056.61
   https://launchpad.net/ubuntu/+source/linux-iot/5.4.0-1021.22
   https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1098.104
   https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1108.117