==========================================================================
Ubuntu Security Notice USN-6192-1
June 29, 2023

linux, linux-allwinner, linux-allwinner-5.19, linux-aws, linux-aws-5.19,
linux-azure, linux-gcp, linux-gcp-5.19, linux-hwe-5.19, linux-ibm,
linux-kvm, linux-lowlatency, linux-oracle, linux-raspi, linux-starfive,
linux-starfive-5.19 vulnerabilities
==========================================================================

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

- Ubuntu 22.10
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-allwinner: Linux kernel for Allwinner processors
- 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-ibm: Linux kernel for IBM cloud systems
- linux-kvm: Linux kernel for cloud environments
- linux-lowlatency: Linux low latency kernel
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-starfive: Linux kernel for StarFive processors
- linux-allwinner-5.19: Linux kernel for Allwinner processors
- linux-aws-5.19: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp-5.19: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe-5.19: Linux hardware enablement (HWE) kernel
- linux-starfive-5.19: Linux kernel for StarFive processors

Details:

Hangyu Hua discovered that the Flower classifier implementation in the
Linux kernel contained 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-2023-35788, LP: #2023577)

Xingyuan Mo and Gengjia Chen discovered that the io_uring subsystem in the
Linux kernel did not properly handle locking when IOPOLL mode is being
used. A local attacker could use this to cause a denial of service (system
crash). (CVE-2023-2430)

It was discovered that for some Intel processors the INVLPG instruction
implementation did not properly flush global TLB entries when PCIDs are
enabled. An attacker could use this to expose sensitive information
(kernel memory) or possibly cause undesired behaviors. (LP: #2023220)

Update instructions:

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

Ubuntu 22.10:
   linux-image-5.19.0-1015-allwinner  5.19.0-1015.15
   linux-image-5.19.0-1020-starfive  5.19.0-1020.22
   linux-image-5.19.0-1022-raspi   5.19.0-1022.29
   linux-image-5.19.0-1022-raspi-nolpae  5.19.0-1022.29
   linux-image-5.19.0-1025-ibm     5.19.0-1025.27
   linux-image-5.19.0-1026-kvm     5.19.0-1026.27
   linux-image-5.19.0-1026-oracle  5.19.0-1026.29
   linux-image-5.19.0-1027-gcp     5.19.0-1027.29
   linux-image-5.19.0-1028-aws     5.19.0-1028.29
   linux-image-5.19.0-1028-lowlatency  5.19.0-1028.29
   linux-image-5.19.0-1028-lowlatency-64k  5.19.0-1028.29
   linux-image-5.19.0-1029-azure   5.19.0-1029.32
   linux-image-5.19.0-46-generic   5.19.0-46.47
   linux-image-5.19.0-46-generic-64k  5.19.0-46.47
   linux-image-5.19.0-46-generic-lpae  5.19.0-46.47
   linux-image-allwinner           5.19.0.1015.15
   linux-image-aws                 5.19.0.1028.25
   linux-image-azure               5.19.0.1029.24
   linux-image-gcp                 5.19.0.1027.23
   linux-image-generic             5.19.0.46.42
   linux-image-generic-64k         5.19.0.46.42
   linux-image-generic-lpae        5.19.0.46.42
   linux-image-ibm                 5.19.0.1025.22
   linux-image-kvm                 5.19.0.1026.23
   linux-image-lowlatency          5.19.0.1028.24
   linux-image-lowlatency-64k      5.19.0.1028.24
   linux-image-oracle              5.19.0.1026.22
   linux-image-raspi               5.19.0.1022.21
   linux-image-raspi-nolpae        5.19.0.1022.21
   linux-image-starfive            5.19.0.1020.18
   linux-image-virtual             5.19.0.46.42

Ubuntu 22.04 LTS:
   linux-image-5.19.0-1015-allwinner  5.19.0-1015.15~22.04.1
   linux-image-5.19.0-1020-starfive  5.19.0-1020.22~22.04.1
   linux-image-5.19.0-1027-gcp     5.19.0-1027.29~22.04.1
   linux-image-5.19.0-1028-aws     5.19.0-1028.29~22.04.1
   linux-image-5.19.0-46-generic   5.19.0-46.47~22.04.1
   linux-image-5.19.0-46-generic-64k  5.19.0-46.47~22.04.1
   linux-image-5.19.0-46-generic-lpae  5.19.0-46.47~22.04.1
   linux-image-allwinner           5.19.0.1015.15~22.04.8
   linux-image-aws                 5.19.0.1028.29~22.04.12
   linux-image-gcp                 5.19.0.1027.29~22.04.1
   linux-image-generic-64k-hwe-22.04  5.19.0.46.47~22.04.21
   linux-image-generic-hwe-22.04   5.19.0.46.47~22.04.21
   linux-image-generic-lpae-hwe-22.04  5.19.0.46.47~22.04.21
   linux-image-starfive            5.19.0.1020.22~22.04.7
   linux-image-virtual-hwe-22.04   5.19.0.46.47~22.04.21

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-6192-1
   https://launchpad.net/bugs/2023220
   https://launchpad.net/bugs/2023577
   CVE-2023-2430, CVE-2023-35788

Package Information:
   https://launchpad.net/ubuntu/+source/linux/5.19.0-46.47
   https://launchpad.net/ubuntu/+source/linux-allwinner/5.19.0-1015.15
   https://launchpad.net/ubuntu/+source/linux-aws/5.19.0-1028.29
   https://launchpad.net/ubuntu/+source/linux-azure/5.19.0-1029.32
   https://launchpad.net/ubuntu/+source/linux-gcp/5.19.0-1027.29
   https://launchpad.net/ubuntu/+source/linux-ibm/5.19.0-1025.27
   https://launchpad.net/ubuntu/+source/linux-kvm/5.19.0-1026.27
   https://launchpad.net/ubuntu/+source/linux-lowlatency/5.19.0-1028.29
   https://launchpad.net/ubuntu/+source/linux-oracle/5.19.0-1026.29
   https://launchpad.net/ubuntu/+source/linux-raspi/5.19.0-1022.29
   https://launchpad.net/ubuntu/+source/linux-starfive/5.19.0-1020.22
 
https://launchpad.net/ubuntu/+source/linux-allwinner-5.19/5.19.0-1015.15~22.04.1
   https://launchpad.net/ubuntu/+source/linux-aws-5.19/5.19.0-1028.29~22.04.1
   https://launchpad.net/ubuntu/+source/linux-gcp-5.19/5.19.0-1027.29~22.04.1
   https://launchpad.net/ubuntu/+source/linux-hwe-5.19/5.19.0-46.47~22.04.1
 
https://launchpad.net/ubuntu/+source/linux-starfive-5.19/5.19.0-1020.22~22.04.1