==========================================================================
Ubuntu Security Notice USN-6495-1
November 21, 2023

linux, linux-aws, linux-aws-5.4, linux-bluefield, 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-bluefield: Linux kernel for NVIDIA BlueField platforms
- 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-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:

Yu Hao discovered that the UBI driver in the Linux kernel did not properly
check for MTD with zero erasesize during device attachment. A local
privileged attacker could use this to cause a denial of service (system
crash). (CVE-2023-31085)

Manfred Rudigier discovered that the Intel(R) PCI-Express Gigabit (igb)
Ethernet driver in the Linux kernel did not properly validate received
frames that are larger than the set MTU size, leading to a buffer overflow
vulnerability. An attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2023-45871)

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-iot      5.4.0-1026.27
   linux-image-5.4.0-1034-xilinx-zynqmp  5.4.0-1034.38
   linux-image-5.4.0-1061-ibm      5.4.0-1061.66
   linux-image-5.4.0-1075-bluefield  5.4.0-1075.81
   linux-image-5.4.0-1098-raspi    5.4.0-1098.110
   linux-image-5.4.0-1103-kvm      5.4.0-1103.110
   linux-image-5.4.0-1113-oracle   5.4.0-1113.122
   linux-image-5.4.0-1114-aws      5.4.0-1114.124
   linux-image-5.4.0-167-generic   5.4.0-167.184
   linux-image-5.4.0-167-generic-lpae  5.4.0-167.184
   linux-image-5.4.0-167-lowlatency  5.4.0-167.184
   linux-image-aws-lts-20.04       5.4.0.1114.111
   linux-image-bluefield           5.4.0.1075.70
   linux-image-generic             5.4.0.167.164
   linux-image-generic-lpae        5.4.0.167.164
   linux-image-ibm-lts-20.04       5.4.0.1061.90
   linux-image-kvm                 5.4.0.1103.99
   linux-image-lowlatency          5.4.0.167.164
   linux-image-oem                 5.4.0.167.164
   linux-image-oem-osp1            5.4.0.167.164
   linux-image-oracle-lts-20.04    5.4.0.1113.106
   linux-image-raspi               5.4.0.1098.128
   linux-image-raspi2              5.4.0.1098.128
   linux-image-virtual             5.4.0.167.164
   linux-image-xilinx-zynqmp       5.4.0.1034.34

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-5.4.0-1061-ibm      5.4.0-1061.66~18.04.1
   linux-image-5.4.0-1098-raspi    5.4.0-1098.110~18.04.2
   linux-image-5.4.0-1113-oracle   5.4.0-1113.122~18.04.1
   linux-image-5.4.0-1114-aws      5.4.0-1114.124~18.04.1
   linux-image-5.4.0-167-generic   5.4.0-167.184~18.04.1
   linux-image-5.4.0-167-lowlatency  5.4.0-167.184~18.04.1
   linux-image-aws                 5.4.0.1114.92
   linux-image-generic-hwe-18.04   5.4.0.167.184~18.04.135
   linux-image-ibm                 5.4.0.1061.72
   linux-image-lowlatency-hwe-18.04  5.4.0.167.184~18.04.135
   linux-image-oem                 5.4.0.167.184~18.04.135
   linux-image-oem-osp1            5.4.0.167.184~18.04.135
   linux-image-oracle              5.4.0.1113.122~18.04.85
   linux-image-raspi-hwe-18.04     5.4.0.1098.95
   linux-image-snapdragon-hwe-18.04  5.4.0.167.184~18.04.135
   linux-image-virtual-hwe-18.04   5.4.0.167.184~18.04.135

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-6495-1
   CVE-2023-31085, CVE-2023-45871

Package Information:
   https://launchpad.net/ubuntu/+source/linux/5.4.0-167.184
   https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1114.124
   https://launchpad.net/ubuntu/+source/linux-bluefield/5.4.0-1075.81
   https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1061.66
   https://launchpad.net/ubuntu/+source/linux-iot/5.4.0-1026.27
   https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1103.110
   https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1113.122
   https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1098.110
   https://launchpad.net/ubuntu/+source/linux-xilinx-zynqmp/5.4.0-1034.38