==========================================================================
Ubuntu Security Notice USN-6648-1
February 22, 2024

linux, linux-aws, linux-aws-5.4, linux-bluefield, linux-gcp, 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-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-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 a race condition existed in the AppleTalk networking
subsystem of the Linux kernel, 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-2023-51781)

Zhenghan Wang discovered that the generic ID allocator implementation in
the Linux kernel did not properly check for null bitmap when releasing IDs.
A local attacker could use this to cause a denial of service (system
crash). (CVE-2023-6915)

Robert Morris discovered that the CIFS network file system implementation
in the Linux kernel did not properly validate certain server commands
fields, leading to an out-of-bounds read vulnerability. An attacker could
use this to cause a denial of service (system crash) or possibly expose
sensitive information. (CVE-2024-0565)

Jann Horn discovered that the TLS subsystem in the Linux kernel did not
properly handle spliced messages, 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-2024-0646)

Update instructions:

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1031-iot      5.4.0-1031.32
   linux-image-5.4.0-1038-xilinx-zynqmp  5.4.0-1038.42
   linux-image-5.4.0-1066-ibm      5.4.0-1066.71
   linux-image-5.4.0-1079-bluefield  5.4.0-1079.85
   linux-image-5.4.0-1086-gkeop    5.4.0-1086.90
   linux-image-5.4.0-1103-raspi    5.4.0-1103.115
   linux-image-5.4.0-1107-kvm      5.4.0-1107.114
   linux-image-5.4.0-1118-oracle   5.4.0-1118.127
   linux-image-5.4.0-1119-aws      5.4.0-1119.129
   linux-image-5.4.0-1123-gcp      5.4.0-1123.132
   linux-image-5.4.0-172-generic   5.4.0-172.190
   linux-image-5.4.0-172-generic-lpae  5.4.0-172.190
   linux-image-5.4.0-172-lowlatency  5.4.0-172.190
   linux-image-aws-lts-20.04       5.4.0.1119.116
   linux-image-bluefield           5.4.0.1079.74
   linux-image-gcp-lts-20.04       5.4.0.1123.125
   linux-image-generic             5.4.0.172.170
   linux-image-generic-lpae        5.4.0.172.170
   linux-image-gkeop               5.4.0.1086.84
   linux-image-gkeop-5.4           5.4.0.1086.84
   linux-image-ibm-lts-20.04       5.4.0.1066.95
   linux-image-kvm                 5.4.0.1107.103
   linux-image-lowlatency          5.4.0.172.170
   linux-image-oem                 5.4.0.172.170
   linux-image-oem-osp1            5.4.0.172.170
   linux-image-oracle-lts-20.04    5.4.0.1118.111
   linux-image-raspi               5.4.0.1103.133
   linux-image-raspi2              5.4.0.1103.133
   linux-image-virtual             5.4.0.172.170
   linux-image-xilinx-zynqmp       5.4.0.1038.38

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-5.4.0-1066-ibm      5.4.0-1066.71~18.04.1
   linux-image-5.4.0-1103-raspi    5.4.0-1103.115~18.04.1
   linux-image-5.4.0-1118-oracle   5.4.0-1118.127~18.04.1
   linux-image-5.4.0-1119-aws      5.4.0-1119.129~18.04.1
   linux-image-5.4.0-172-generic   5.4.0-172.190~18.04.1
   linux-image-5.4.0-172-lowlatency  5.4.0-172.190~18.04.1
   linux-image-aws                 5.4.0.1119.97
   linux-image-generic-hwe-18.04   5.4.0.172.190~18.04.140
   linux-image-ibm                 5.4.0.1066.76
   linux-image-lowlatency-hwe-18.04  5.4.0.172.190~18.04.140
   linux-image-oem                 5.4.0.172.190~18.04.140
   linux-image-oem-osp1            5.4.0.172.190~18.04.140
   linux-image-oracle              5.4.0.1118.127~18.04.90
   linux-image-raspi-hwe-18.04     5.4.0.1103.100
   linux-image-snapdragon-hwe-18.04  5.4.0.172.190~18.04.140
   linux-image-virtual-hwe-18.04   5.4.0.172.190~18.04.140

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-6648-1
   CVE-2023-51781, CVE-2023-6915, CVE-2024-0565, CVE-2024-0646

Package Information:
   https://launchpad.net/ubuntu/+source/linux/5.4.0-172.190
   https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1119.129
   https://launchpad.net/ubuntu/+source/linux-bluefield/5.4.0-1079.85
   https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1123.132
   https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1086.90
   https://launchpad.net/ubuntu/+source/linux-ibm/5.4.0-1066.71
   https://launchpad.net/ubuntu/+source/linux-iot/5.4.0-1031.32
   https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1107.114
   https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1118.127
   https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1103.115
   https://launchpad.net/ubuntu/+source/linux-xilinx-zynqmp/5.4.0-1038.42