==========================================================================
Ubuntu Security Notice USN-6465-1
October 31, 2023

linux, linux-aws, linux-aws-5.15, linux-azure, linux-azure-5.15,
linux-azure-fde, linux-azure-fde-5.15, linux-gcp, linux-gcp-5.15,
linux-gkeop, linux-gkeop-5.15, linux-hwe-5.15, linux-ibm, linux-ibm-5.15,
linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-nvidia,
linux-oracle, linux-oracle-5.15 vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

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-azure-fde: Linux kernel for Microsoft Azure CVM cloud systems
- 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-kvm: Linux kernel for cloud environments
- linux-lowlatency: Linux low latency kernel
- linux-nvidia: Linux kernel for NVIDIA systems
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-aws-5.15: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-5.15: Linux kernel for Microsoft Azure cloud systems
- linux-azure-fde-5.15: Linux kernel for Microsoft Azure CVM cloud systems
- linux-gcp-5.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gkeop-5.15: Linux kernel for Google Container Engine (GKE) systems
- linux-hwe-5.15: Linux hardware enablement (HWE) kernel
- linux-ibm-5.15: Linux kernel for IBM cloud systems
- linux-lowlatency-hwe-5.15: Linux low latency kernel
- linux-oracle-5.15: Linux kernel for Oracle Cloud systems

Details:

Yu Hao and Weiteng Chen discovered that the Bluetooth HCI UART driver in
the Linux kernel contained a race condition, leading to a null pointer
dereference vulnerability. A local attacker could use this to cause a
denial of service (system crash). (CVE-2023-31083)

Lin Ma discovered that the Netlink Transformation (XFRM) subsystem in the
Linux kernel contained a null pointer dereference vulnerability in some
situations. A local privileged attacker could use this to cause a denial of
service (system crash). (CVE-2023-3772)

Update instructions:

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

Ubuntu 22.04 LTS:
   linux-image-5.15.0-1032-gkeop   5.15.0-1032.38
   linux-image-5.15.0-1040-nvidia  5.15.0-1040.40
   linux-image-5.15.0-1040-nvidia-lowlatency  5.15.0-1040.40
   linux-image-5.15.0-1042-ibm     5.15.0-1042.45
   linux-image-5.15.0-1046-gcp     5.15.0-1046.54
   linux-image-5.15.0-1046-kvm     5.15.0-1046.51
   linux-image-5.15.0-1047-oracle  5.15.0-1047.53
   linux-image-5.15.0-1049-aws     5.15.0-1049.54
   linux-image-5.15.0-1051-azure   5.15.0-1051.59
   linux-image-5.15.0-1051-azure-fde  5.15.0-1051.59.1
   linux-image-5.15.0-88-generic   5.15.0-88.98
   linux-image-5.15.0-88-generic-64k  5.15.0-88.98
   linux-image-5.15.0-88-generic-lpae  5.15.0-88.98
   linux-image-5.15.0-88-lowlatency  5.15.0-88.98
   linux-image-5.15.0-88-lowlatency-64k  5.15.0-88.98
   linux-image-aws-lts-22.04       5.15.0.1049.48
   linux-image-azure-fde-lts-22.04  5.15.0.1051.59.29
   linux-image-azure-lts-22.04     5.15.0.1051.47
   linux-image-gcp-lts-22.04       5.15.0.1046.42
   linux-image-generic             5.15.0.88.85
   linux-image-generic-64k         5.15.0.88.85
   linux-image-generic-lpae        5.15.0.88.85
   linux-image-gkeop               5.15.0.1032.31
   linux-image-gkeop-5.15          5.15.0.1032.31
   linux-image-ibm                 5.15.0.1042.38
   linux-image-kvm                 5.15.0.1046.42
   linux-image-lowlatency          5.15.0.88.90
   linux-image-lowlatency-64k      5.15.0.88.90
   linux-image-nvidia              5.15.0.1040.40
   linux-image-nvidia-lowlatency   5.15.0.1040.40
   linux-image-oracle              5.15.0.1047.42
   linux-image-oracle-lts-22.04    5.15.0.1047.42
   linux-image-virtual             5.15.0.88.85

Ubuntu 20.04 LTS:
   linux-image-5.15.0-1032-gkeop   5.15.0-1032.38~20.04.1
   linux-image-5.15.0-1042-ibm     5.15.0-1042.45~20.04.1
   linux-image-5.15.0-1046-gcp     5.15.0-1046.54~20.04.1
   linux-image-5.15.0-1047-oracle  5.15.0-1047.53~20.04.1
   linux-image-5.15.0-1049-aws     5.15.0-1049.54~20.04.1
   linux-image-5.15.0-1051-azure   5.15.0-1051.59~20.04.1
   linux-image-5.15.0-1051-azure-fde  5.15.0-1051.59~20.04.1.1
   linux-image-5.15.0-88-generic   5.15.0-88.98~20.04.1
   linux-image-5.15.0-88-generic-64k  5.15.0-88.98~20.04.1
   linux-image-5.15.0-88-generic-lpae  5.15.0-88.98~20.04.1
   linux-image-5.15.0-88-lowlatency  5.15.0-88.98~20.04.1
   linux-image-5.15.0-88-lowlatency-64k  5.15.0-88.98~20.04.1
   linux-image-aws                 5.15.0.1049.54~20.04.37
   linux-image-azure               5.15.0.1051.59~20.04.40
   linux-image-azure-cvm           5.15.0.1051.59~20.04.40
   linux-image-azure-fde           5.15.0.1051.59~20.04.1.29
   linux-image-gcp                 5.15.0.1046.54~20.04.1
   linux-image-generic-64k-hwe-20.04  5.15.0.88.98~20.04.46
   linux-image-generic-hwe-20.04   5.15.0.88.98~20.04.46
   linux-image-generic-lpae-hwe-20.04  5.15.0.88.98~20.04.46
   linux-image-gkeop-5.15          5.15.0.1032.38~20.04.28
   linux-image-ibm                 5.15.0.1042.45~20.04.14
   linux-image-lowlatency-64k-hwe-20.04  5.15.0.88.98~20.04.43
   linux-image-lowlatency-hwe-20.04  5.15.0.88.98~20.04.43
   linux-image-oem-20.04           5.15.0.88.98~20.04.46
   linux-image-oem-20.04b          5.15.0.88.98~20.04.46
   linux-image-oem-20.04c          5.15.0.88.98~20.04.46
   linux-image-oem-20.04d          5.15.0.88.98~20.04.46
   linux-image-oracle              5.15.0.1047.53~20.04.1
   linux-image-virtual-hwe-20.04   5.15.0.88.98~20.04.46

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-6465-1
   CVE-2023-31083, CVE-2023-3772

Package Information:
   https://launchpad.net/ubuntu/+source/linux/5.15.0-88.98
   https://launchpad.net/ubuntu/+source/linux-aws/5.15.0-1049.54
   https://launchpad.net/ubuntu/+source/linux-azure/5.15.0-1051.59
   https://launchpad.net/ubuntu/+source/linux-azure-fde/5.15.0-1051.59.1
   https://launchpad.net/ubuntu/+source/linux-gcp/5.15.0-1046.54
   https://launchpad.net/ubuntu/+source/linux-gkeop/5.15.0-1032.38
   https://launchpad.net/ubuntu/+source/linux-ibm/5.15.0-1042.45
   https://launchpad.net/ubuntu/+source/linux-kvm/5.15.0-1046.51
   https://launchpad.net/ubuntu/+source/linux-lowlatency/5.15.0-88.98
   https://launchpad.net/ubuntu/+source/linux-nvidia/5.15.0-1040.40
   https://launchpad.net/ubuntu/+source/linux-oracle/5.15.0-1047.53
   https://launchpad.net/ubuntu/+source/linux-aws-5.15/5.15.0-1049.54~20.04.1
   https://launchpad.net/ubuntu/+source/linux-azure-5.15/5.15.0-1051.59~20.04.1
 
https://launchpad.net/ubuntu/+source/linux-azure-fde-5.15/5.15.0-1051.59~20.04.1.1
   https://launchpad.net/ubuntu/+source/linux-gcp-5.15/5.15.0-1046.54~20.04.1
   https://launchpad.net/ubuntu/+source/linux-gkeop-5.15/5.15.0-1032.38~20.04.1
   https://launchpad.net/ubuntu/+source/linux-hwe-5.15/5.15.0-88.98~20.04.1
   https://launchpad.net/ubuntu/+source/linux-ibm-5.15/5.15.0-1042.45~20.04.1
 
https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-5.15/5.15.0-88.98~20.04.1
 
https://launchpad.net/ubuntu/+source/linux-oracle-5.15/5.15.0-1047.53~20.04.1