==========================================================================
Ubuntu Security Notice USN-6251-1
July 26, 2023

linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp,
linux-gcp-5.4, linux-gke, linux-gkeop, linux-hwe-5.4, linux-ibm,
linux-ibm-5.4, 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke: Linux kernel for Google Container Engine (GKE) systems
- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems
- linux-ibm: Linux kernel for IBM cloud systems
- 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 IP-VLAN network driver for the Linux kernel did
not properly initialize memory in some situations, leading to an out-of-
bounds write vulnerability. An attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2023-3090)

Shir Tamari and Sagi Tzadik discovered that the OverlayFS implementation in
the Ubuntu Linux kernel did not properly perform permission checks in
certain situations. A local attacker could possibly use this to gain
elevated privileges. (CVE-2023-32629)

It was discovered that the netfilter subsystem in the Linux kernel did not
properly handle some error conditions, 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-2023-3390)

Tanguy Dubroca discovered that the netfilter subsystem in the Linux kernel
did not properly handle certain pointer data type, leading to an out-of-
bounds write vulnerability. A privileged attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2023-35001)

Update instructions:

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1026-xilinx-zynqmp  5.4.0-1026.30
   linux-image-5.4.0-1053-ibm      5.4.0-1053.58
   linux-image-5.4.0-1073-gkeop    5.4.0-1073.77
   linux-image-5.4.0-1090-raspi    5.4.0-1090.101
   linux-image-5.4.0-1095-kvm      5.4.0-1095.101
   linux-image-5.4.0-1104-gke      5.4.0-1104.111
   linux-image-5.4.0-1105-oracle   5.4.0-1105.114
   linux-image-5.4.0-1106-aws      5.4.0-1106.114
   linux-image-5.4.0-1109-gcp      5.4.0-1109.118
   linux-image-5.4.0-1112-azure    5.4.0-1112.118
   linux-image-5.4.0-155-generic   5.4.0-155.172
   linux-image-5.4.0-155-generic-lpae  5.4.0-155.172
   linux-image-5.4.0-155-lowlatency  5.4.0-155.172
   linux-image-aws-lts-20.04       5.4.0.1106.103
   linux-image-azure-lts-20.04     5.4.0.1112.105
   linux-image-gcp-lts-20.04       5.4.0.1109.111
   linux-image-generic             5.4.0.155.151
   linux-image-generic-lpae        5.4.0.155.151
   linux-image-gke                 5.4.0.1104.109
   linux-image-gke-5.4             5.4.0.1104.109
   linux-image-gkeop               5.4.0.1073.71
   linux-image-gkeop-5.4           5.4.0.1073.71
   linux-image-ibm                 5.4.0.1053.79
   linux-image-ibm-lts-20.04       5.4.0.1053.79
   linux-image-kvm                 5.4.0.1095.90
   linux-image-lowlatency          5.4.0.155.151
   linux-image-oem                 5.4.0.155.151
   linux-image-oem-osp1            5.4.0.155.151
   linux-image-oracle-lts-20.04    5.4.0.1105.98
   linux-image-raspi               5.4.0.1090.120
   linux-image-raspi2              5.4.0.1090.120
   linux-image-virtual             5.4.0.155.151
   linux-image-xilinx-zynqmp       5.4.0.1026.28

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-5.4.0-1053-ibm      5.4.0-1053.58~18.04.1
   linux-image-5.4.0-1090-raspi    5.4.0-1090.101~18.04.1
   linux-image-5.4.0-1105-oracle   5.4.0-1105.114~18.04.1
   linux-image-5.4.0-1106-aws      5.4.0-1106.114~18.04.1
   linux-image-5.4.0-1109-gcp      5.4.0-1109.118~18.04.1
   linux-image-5.4.0-1112-azure    5.4.0-1112.118~18.04.1
   linux-image-5.4.0-155-generic   5.4.0-155.172~18.04.1
   linux-image-5.4.0-155-generic-lpae  5.4.0-155.172~18.04.1
   linux-image-5.4.0-155-lowlatency  5.4.0-155.172~18.04.1
   linux-image-aws                 5.4.0.1106.84
   linux-image-azure               5.4.0.1112.85
   linux-image-gcp                 5.4.0.1109.85
   linux-image-generic-hwe-18.04   5.4.0.155.172~18.04.125
   linux-image-generic-lpae-hwe-18.04  5.4.0.155.172~18.04.125
   linux-image-ibm                 5.4.0.1053.64
   linux-image-lowlatency-hwe-18.04  5.4.0.155.172~18.04.125
   linux-image-oem                 5.4.0.155.172~18.04.125
   linux-image-oem-osp1            5.4.0.155.172~18.04.125
   linux-image-oracle              5.4.0.1105.114~18.04.77
   linux-image-raspi-hwe-18.04     5.4.0.1090.87
   linux-image-snapdragon-hwe-18.04  5.4.0.155.172~18.04.125
   linux-image-virtual-hwe-18.04   5.4.0.155.172~18.04.125

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-6251-1
   CVE-2023-3090, CVE-2023-32629, CVE-2023-3390, CVE-2023-35001

Package Information:
   https://launchpad.net/ubuntu/+source/linux/5.4.0-155.172
   https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1106.114
   https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1112.118
   https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1109.118
   https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1104.111
   https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1073.77
   https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1053.58
   https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1095.101
   https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1105.114
   https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1090.101
   https://launchpad.net/ubuntu/+source/linux-xilinx-zynqmp/5.4.0-1026.30