==========================================================================
Ubuntu Security Notice USN-6548-1
December 11, 2023

linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4,
linux-bluefield, linux-gcp, linux-gcp-5.4, linux-hwe-5.4, linux-ibm,
linux-ibm-5.4, linux-kvm, 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-ibm: Linux kernel for IBM cloud systems
- linux-kvm: Linux kernel for cloud environments
- 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

Details:

It was discovered that Spectre-BHB mitigations were missing for Ampere
processors. A local attacker could potentially use this to expose sensitive
information. (CVE-2023-3006)

It was discovered that the USB subsystem in the Linux kernel contained a
race condition while handling device descriptors in certain situations,
leading to a out-of-bounds read vulnerability. A local attacker could
possibly use this to cause a denial of service (system crash).
(CVE-2023-37453)

Lucas Leong discovered that the netfilter subsystem in the Linux kernel did
not properly validate some attributes passed from userspace. A local
attacker could use this to cause a denial of service (system crash) or
possibly expose sensitive information (kernel memory). (CVE-2023-39189)

Sunjoo Park discovered that the netfilter subsystem in the Linux kernel did
not properly validate u32 packets content, leading to an out-of-bounds read
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly expose sensitive information. (CVE-2023-39192)

Lucas Leong discovered that the netfilter subsystem in the Linux kernel did
not properly validate SCTP data, leading to an out-of-bounds read
vulnerability. A local attacker could use this to cause a denial of service
(system crash) or possibly expose sensitive information. (CVE-2023-39193)

Lucas Leong discovered that the Netlink Transformation (XFRM) subsystem in
the Linux kernel did not properly handle state filters, leading to an out-
of-bounds read vulnerability. A privileged local attacker could use this to
cause a denial of service (system crash) or possibly expose sensitive
information. (CVE-2023-39194)

Kyle Zeng discovered that the IPv4 implementation in the Linux kernel did
not properly handle socket buffers (skb) when performing IP routing in
certain circumstances, leading to a null pointer dereference vulnerability.
A privileged attacker could use this to cause a denial of service (system
crash). (CVE-2023-42754)

Alon Zahavi discovered that the NVMe-oF/TCP subsystem in the Linux kernel
did not properly handle queue initialization failures in certain
situations, leading to a use-after-free vulnerability. A remote attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2023-5178)

Budimir Markovic discovered that the perf subsystem in the Linux kernel did
not properly handle event groups, leading to 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-2023-5717)

It was discovered that the TLS subsystem in the Linux kernel did not
properly perform cryptographic operations in some situations, leading to a
null pointer dereference vulnerability. A local attacker could use this to
cause a denial of service (system crash) or possibly execute arbitrary
code. (CVE-2023-6176)

Update instructions:

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1035-xilinx-zynqmp  5.4.0-1035.39
   linux-image-5.4.0-1063-ibm      5.4.0-1063.68
   linux-image-5.4.0-1076-bluefield  5.4.0-1076.82
   linux-image-5.4.0-1104-kvm      5.4.0-1104.111
   linux-image-5.4.0-1116-aws      5.4.0-1116.126
   linux-image-5.4.0-1120-gcp      5.4.0-1120.129
   linux-image-5.4.0-1121-azure    5.4.0-1121.128
   linux-image-5.4.0-169-generic   5.4.0-169.187
   linux-image-5.4.0-169-generic-lpae  5.4.0-169.187
   linux-image-5.4.0-169-lowlatency  5.4.0-169.187
   linux-image-aws-lts-20.04       5.4.0.1116.113
   linux-image-azure-lts-20.04     5.4.0.1121.114
   linux-image-bluefield           5.4.0.1076.71
   linux-image-gcp-lts-20.04       5.4.0.1120.122
   linux-image-generic             5.4.0.169.167
   linux-image-generic-lpae        5.4.0.169.167
   linux-image-ibm-lts-20.04       5.4.0.1063.92
   linux-image-kvm                 5.4.0.1104.100
   linux-image-lowlatency          5.4.0.169.167
   linux-image-oem                 5.4.0.169.167
   linux-image-oem-osp1            5.4.0.169.167
   linux-image-virtual             5.4.0.169.167
   linux-image-xilinx-zynqmp       5.4.0.1035.35

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-5.4.0-1063-ibm      5.4.0-1063.68~18.04.1
   linux-image-5.4.0-1116-aws      5.4.0-1116.126~18.04.1
   linux-image-5.4.0-1120-gcp      5.4.0-1120.129~18.04.1
   linux-image-5.4.0-1121-azure    5.4.0-1121.128~18.04.1
   linux-image-5.4.0-169-generic   5.4.0-169.187~18.04.1
   linux-image-5.4.0-169-lowlatency  5.4.0-169.187~18.04.1
   linux-image-aws                 5.4.0.1116.94
   linux-image-azure               5.4.0.1121.94
   linux-image-gcp                 5.4.0.1120.96
   linux-image-generic-hwe-18.04   5.4.0.169.187~18.04.137
   linux-image-ibm                 5.4.0.1063.73
   linux-image-lowlatency-hwe-18.04  5.4.0.169.187~18.04.137
   linux-image-oem                 5.4.0.169.187~18.04.137
   linux-image-oem-osp1            5.4.0.169.187~18.04.137
   linux-image-snapdragon-hwe-18.04  5.4.0.169.187~18.04.137
   linux-image-virtual-hwe-18.04   5.4.0.169.187~18.04.137

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-6548-1
   CVE-2023-3006, CVE-2023-37453, CVE-2023-39189, CVE-2023-39192,
   CVE-2023-39193, CVE-2023-39194, CVE-2023-42754, CVE-2023-5178,
   CVE-2023-5717, CVE-2023-6176

Package Information:
   https://launchpad.net/ubuntu/+source/linux/5.4.0-169.187
   https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1116.126
   https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1121.128
   https://launchpad.net/ubuntu/+source/linux-bluefield/5.4.0-1076.82
   https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1120.129
   https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1063.68
   https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1104.111
   https://launchpad.net/ubuntu/+source/linux-xilinx-zynqmp/5.4.0-1035.39