==========================================================================
Ubuntu Security Notice USN-6626-1
February 08, 2024

linux, linux-aws, linux-aws-5.15, linux-gcp, linux-gcp-5.15, linux-gke,
linux-gkeop, linux-gkeop-5.15, linux-hwe-5.15, linux-ibm, linux-ibm-5.15,
linux-kvm, 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-gke: Linux kernel for Google Container Engine (GKE) 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-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-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:

Quentin Minster discovered that a race condition existed in the KSMBD
implementation in the Linux kernel when handling sessions operations. A
remote attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2023-32250, CVE-2023-32252,
CVE-2023-32257)

Marek Marczykowski-Górecki discovered that the Xen event channel
infrastructure implementation in the Linux kernel contained a race
condition. An attacker in a guest VM could possibly use this to cause a
denial of service (paravirtualized device unavailability). (CVE-2023-34324)

Zheng Wang discovered a use-after-free in the Renesas Ethernet AVB driver
in the Linux kernel during device removal. A privileged attacker could use
this to cause a denial of service (system crash). (CVE-2023-35827)

Tom Dohrmann discovered that the Secure Encrypted Virtualization (SEV)
implementation for AMD processors in the Linux kernel contained a race
condition when accessing MMIO registers. A local attacker in a SEV guest VM
could possibly use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2023-46813)

It was discovered that the Microchip USB Ethernet driver in the Linux
kernel contained a race condition during device removal, leading to a use-
after-free vulnerability. A physically proximate attacker could use this to
cause a denial of service (system crash). (CVE-2023-6039)

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)

Xingyuan Mo discovered that the netfilter subsystem in the Linux kernel did
not properly handle dynset expressions passed from userspace, leading to a
null pointer dereference vulnerability. A local attacker could use this to
cause a denial of service (system crash). (CVE-2023-6622)

It was discovered that the TIPC protocol implementation in the Linux kernel
did not properly handle locking during tipc_crypto_key_revoke() operations.
A local attacker could use this to cause a denial of service (kernel
deadlock). (CVE-2024-0641)

Update instructions:

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

Ubuntu 22.04 LTS:
   linux-image-5.15.0-1036-gkeop   5.15.0-1036.42
   linux-image-5.15.0-1044-nvidia  5.15.0-1044.44
   linux-image-5.15.0-1044-nvidia-lowlatency  5.15.0-1044.44
   linux-image-5.15.0-1046-ibm     5.15.0-1046.49
   linux-image-5.15.0-1050-gke     5.15.0-1050.55
   linux-image-5.15.0-1050-kvm     5.15.0-1050.55
   linux-image-5.15.0-1051-gcp     5.15.0-1051.59
   linux-image-5.15.0-1051-oracle  5.15.0-1051.57
   linux-image-5.15.0-1053-aws     5.15.0-1053.58
   linux-image-5.15.0-94-generic   5.15.0-94.104
   linux-image-5.15.0-94-generic-64k  5.15.0-94.104
   linux-image-5.15.0-94-generic-lpae  5.15.0-94.104
   linux-image-aws-lts-22.04       5.15.0.1053.52
   linux-image-gcp-lts-22.04       5.15.0.1051.47
   linux-image-generic             5.15.0.94.91
   linux-image-generic-64k         5.15.0.94.91
   linux-image-generic-lpae        5.15.0.94.91
   linux-image-gke                 5.15.0.1050.49
   linux-image-gke-5.15            5.15.0.1050.49
   linux-image-gkeop               5.15.0.1036.35
   linux-image-gkeop-5.15          5.15.0.1036.35
   linux-image-ibm                 5.15.0.1046.42
   linux-image-kvm                 5.15.0.1050.46
   linux-image-nvidia              5.15.0.1044.44
   linux-image-nvidia-lowlatency   5.15.0.1044.44
   linux-image-oracle              5.15.0.1051.46
   linux-image-oracle-lts-22.04    5.15.0.1051.46
   linux-image-virtual             5.15.0.94.91

Ubuntu 20.04 LTS:
   linux-image-5.15.0-1036-gkeop   5.15.0-1036.42~20.04.1
   linux-image-5.15.0-1046-ibm     5.15.0-1046.49~20.04.1
   linux-image-5.15.0-1051-gcp     5.15.0-1051.59~20.04.1
   linux-image-5.15.0-1051-oracle  5.15.0-1051.57~20.04.1
   linux-image-5.15.0-1053-aws     5.15.0-1053.58~20.04.1
   linux-image-5.15.0-94-generic   5.15.0-94.104~20.04.1
   linux-image-5.15.0-94-generic-64k  5.15.0-94.104~20.04.1
   linux-image-5.15.0-94-generic-lpae  5.15.0-94.104~20.04.1
   linux-image-5.15.0-94-lowlatency  5.15.0-94.104~20.04.1
   linux-image-5.15.0-94-lowlatency-64k  5.15.0-94.104~20.04.1
   linux-image-aws                 5.15.0.1053.58~20.04.41
   linux-image-gcp                 5.15.0.1051.59~20.04.1
   linux-image-generic-64k-hwe-20.04  5.15.0.94.104~20.04.50
   linux-image-generic-hwe-20.04   5.15.0.94.104~20.04.50
   linux-image-generic-lpae-hwe-20.04  5.15.0.94.104~20.04.50
   linux-image-gkeop-5.15          5.15.0.1036.42~20.04.32
   linux-image-ibm                 5.15.0.1046.49~20.04.18
   linux-image-lowlatency-64k-hwe-20.04  5.15.0.94.104~20.04.47
   linux-image-lowlatency-hwe-20.04  5.15.0.94.104~20.04.47
   linux-image-oem-20.04           5.15.0.94.104~20.04.50
   linux-image-oem-20.04b          5.15.0.94.104~20.04.50
   linux-image-oem-20.04c          5.15.0.94.104~20.04.50
   linux-image-oem-20.04d          5.15.0.94.104~20.04.50
   linux-image-oracle              5.15.0.1051.57~20.04.1
   linux-image-virtual-hwe-20.04   5.15.0.94.104~20.04.50

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-6626-1
   CVE-2023-32250, CVE-2023-32252, CVE-2023-32257, CVE-2023-34324,
   CVE-2023-35827, CVE-2023-46813, CVE-2023-6039, CVE-2023-6176,
   CVE-2023-6622, CVE-2024-0641

Package Information:
   https://launchpad.net/ubuntu/+source/linux/5.15.0-94.104
   https://launchpad.net/ubuntu/+source/linux-aws/5.15.0-1053.58
   https://launchpad.net/ubuntu/+source/linux-gcp/5.15.0-1051.59
   https://launchpad.net/ubuntu/+source/linux-gke/5.15.0-1050.55
   https://launchpad.net/ubuntu/+source/linux-gkeop/5.15.0-1036.42
   https://launchpad.net/ubuntu/+source/linux-ibm/5.15.0-1046.49
   https://launchpad.net/ubuntu/+source/linux-kvm/5.15.0-1050.55
   https://launchpad.net/ubuntu/+source/linux-nvidia/5.15.0-1044.44
   https://launchpad.net/ubuntu/+source/linux-oracle/5.15.0-1051.57
   https://launchpad.net/ubuntu/+source/linux-aws-5.15/5.15.0-1053.58~20.04.1
   https://launchpad.net/ubuntu/+source/linux-gcp-5.15/5.15.0-1051.59~20.04.1
   https://launchpad.net/ubuntu/+source/linux-gkeop-5.15/5.15.0-1036.42~20.04.1
   https://launchpad.net/ubuntu/+source/linux-hwe-5.15/5.15.0-94.104~20.04.1
   https://launchpad.net/ubuntu/+source/linux-ibm-5.15/5.15.0-1046.49~20.04.1
 
https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-5.15/5.15.0-94.104~20.04.1
 
https://launchpad.net/ubuntu/+source/linux-oracle-5.15/5.15.0-1051.57~20.04.1