==========================================================================
Ubuntu Security Notice USN-6417-1
October 04, 2023

linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4,
linux-bluefield, linux-gcp, linux-gcp-5.4, linux-gkeop, linux-hwe-5.4,
linux-ibm, linux-ibm-5.4, linux-iot, linux-kvm, linux-oracle,
linux-oracle-5.4, linux-raspi, linux-raspi-5.4, linux-xilinx-zynqmp
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-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-bluefield: Linux kernel for NVIDIA BlueField platforms
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) 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-raspi: Linux kernel for Raspberry Pi systems
- linux-xilinx-zynqmp: Linux kernel for Xilinx ZynqMP processors
- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems
- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel
- linux-ibm-5.4: Linux kernel for IBM cloud systems
- linux-oracle-5.4: Linux kernel for Oracle Cloud systems
- linux-raspi-5.4: Linux kernel for Raspberry Pi systems

Details:

It was discovered that the eBPF implementation in the Linux kernel
contained a race condition around read-only maps. A privileged attacker
could use this to modify read-only maps. (CVE-2021-4001)

It was discovered that the IPv6 implementation in the Linux kernel
contained a high rate of hash collisions in connection lookup table. A
remote attacker could use this to cause a denial of service (excessive CPU
consumption). (CVE-2023-1206)

Yang Lan discovered that the GFS2 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 GFS2 image that, when
mounted and operated on, could cause a denial of service (system crash).
(CVE-2023-3212)

Davide Ornaghi discovered that the DECnet network protocol implementation
in the Linux kernel contained a null pointer dereference vulnerability. A
remote attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. Please note that kernel support for the
DECnet has been removed to resolve this CVE. (CVE-2023-3338)

It was discovered that the NFC implementation in the Linux kernel contained
a use-after-free vulnerability when performing peer-to-peer communication
in certain conditions. A privileged attacker could use this to cause a
denial of service (system crash) or possibly expose sensitive information
(kernel memory). (CVE-2023-3863)

It was discovered that the TUN/TAP driver in the Linux kernel did not
properly initialize socket data. A local attacker could use this to cause a
denial of service (system crash). (CVE-2023-4194)

Update instructions:

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1023-iot      5.4.0-1023.24
   linux-image-5.4.0-1031-xilinx-zynqmp  5.4.0-1031.35
   linux-image-5.4.0-1058-ibm      5.4.0-1058.63
   linux-image-5.4.0-1072-bluefield  5.4.0-1072.78
   linux-image-5.4.0-1078-gkeop    5.4.0-1078.82
   linux-image-5.4.0-1095-raspi    5.4.0-1095.106
   linux-image-5.4.0-1100-kvm      5.4.0-1100.106
   linux-image-5.4.0-1110-oracle   5.4.0-1110.119
   linux-image-5.4.0-1111-aws      5.4.0-1111.120
   linux-image-5.4.0-1115-gcp      5.4.0-1115.124
   linux-image-5.4.0-1117-azure    5.4.0-1117.124
   linux-image-5.4.0-164-generic   5.4.0-164.181
   linux-image-5.4.0-164-generic-lpae  5.4.0-164.181
   linux-image-5.4.0-164-lowlatency  5.4.0-164.181
   linux-image-aws-lts-20.04       5.4.0.1111.108
   linux-image-azure-lts-20.04     5.4.0.1117.110
   linux-image-bluefield           5.4.0.1072.67
   linux-image-gcp-lts-20.04       5.4.0.1115.117
   linux-image-generic             5.4.0.164.161
   linux-image-generic-lpae        5.4.0.164.161
   linux-image-gkeop               5.4.0.1078.76
   linux-image-gkeop-5.4           5.4.0.1078.76
   linux-image-ibm-lts-20.04       5.4.0.1058.87
   linux-image-kvm                 5.4.0.1100.95
   linux-image-lowlatency          5.4.0.164.161
   linux-image-oem                 5.4.0.164.161
   linux-image-oem-osp1            5.4.0.164.161
   linux-image-oracle-lts-20.04    5.4.0.1110.103
   linux-image-raspi               5.4.0.1095.125
   linux-image-raspi2              5.4.0.1095.125
   linux-image-virtual             5.4.0.164.161
   linux-image-xilinx-zynqmp       5.4.0.1031.32

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-5.4.0-1058-ibm      5.4.0-1058.63~18.04.1
   linux-image-5.4.0-1095-raspi    5.4.0-1095.106~18.04.1
   linux-image-5.4.0-1110-oracle   5.4.0-1110.119~18.04.1
   linux-image-5.4.0-1111-aws      5.4.0-1111.120~18.04.1
   linux-image-5.4.0-1115-gcp      5.4.0-1115.124~18.04.1
   linux-image-5.4.0-1117-azure    5.4.0-1117.124~18.04.1
   linux-image-5.4.0-164-generic   5.4.0-164.181~18.04.1
   linux-image-5.4.0-164-lowlatency  5.4.0-164.181~18.04.1
   linux-image-aws                 5.4.0.1111.89
   linux-image-azure               5.4.0.1117.90
   linux-image-gcp                 5.4.0.1115.91
   linux-image-generic-hwe-18.04   5.4.0.164.181~18.04.131
   linux-image-ibm                 5.4.0.1058.69
   linux-image-lowlatency-hwe-18.04  5.4.0.164.181~18.04.131
   linux-image-oem                 5.4.0.164.181~18.04.131
   linux-image-oem-osp1            5.4.0.164.181~18.04.131
   linux-image-oracle              5.4.0.1110.119~18.04.82
   linux-image-raspi-hwe-18.04     5.4.0.1095.92
   linux-image-snapdragon-hwe-18.04  5.4.0.164.181~18.04.131
   linux-image-virtual-hwe-18.04   5.4.0.164.181~18.04.131

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-6417-1
   CVE-2021-4001, CVE-2023-1206, CVE-2023-3212, CVE-2023-3338,
   CVE-2023-3863, CVE-2023-4194

Package Information:
   https://launchpad.net/ubuntu/+source/linux/5.4.0-164.181
   https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1111.120
   https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1117.124
   https://launchpad.net/ubuntu/+source/linux-bluefield/5.4.0-1072.78
   https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1115.124
   https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1078.82
   https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1058.63
   https://launchpad.net/ubuntu/+source/linux-iot/5.4.0-1023.24
   https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1100.106
   https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1110.119
   https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1095.106
   https://launchpad.net/ubuntu/+source/linux-xilinx-zynqmp/5.4.0-1031.35