==========================================================================
Ubuntu Security Notice USN-6740-1
April 19, 2024

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp,
linux-gcp-4.15, linux-hwe, linux-kvm, linux-oracle vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)
- Ubuntu 14.04 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-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

Wei Chen discovered that a race condition existed in the TIPC protocol
implementation in the Linux kernel, leading to a null pointer dereference
vulnerability. A local attacker could use this to cause a denial of service
(system crash). (CVE-2023-1382)

It was discovered that the virtio network implementation in the Linux
kernel did not properly handle file references in the host, leading to a
use-after-free vulnerability. A local attacker could use this to cause a
denial of service (system crash) or possibly expose sensitive information
(kernel memory). (CVE-2023-1838)

Jose Oliveira and Rodrigo Branco discovered that the Spectre Variant 2
mitigations with prctl syscall were insufficient in some situations. A
local attacker could possibly use this to expose sensitive information.
(CVE-2023-1998)

Daniele Antonioli discovered that the Secure Simple Pairing and Secure
Connections pairing in the Bluetooth protocol could allow an
unauthenticated user to complete authentication without pairing
credentials. A physically proximate attacker placed between two Bluetooth
devices could use this to subsequently impersonate one of the paired
devices. (CVE-2023-24023)

shanzhulig discovered that the DRM subsystem in the Linux kernel contained
a race condition when performing certain operation while handling driver
unload, 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-2023-51043)

It was discovered that a race condition existed in the Bluetooth 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-2023-51779)

It was discovered that the device mapper driver in the Linux kernel did not
properly validate target size during certain memory allocations. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2023-52429, CVE-2024-23851)

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)

It was discovered that the SCTP protocol implementation in the Linux kernel
contained a race condition when handling lock acquisition in certain
situations. A local attacker could possibly use this to cause a denial of
service (kernel deadlock). (CVE-2024-0639)

Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
   - Architecture specifics;
   - EDAC drivers;
   - Media drivers;
   - JFS file system;
(CVE-2023-52603, CVE-2023-52464, CVE-2023-52600, CVE-2023-52445,
CVE-2023-52451)

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1130-oracle  4.15.0-1130.141
   linux-image-4.15.0-1151-kvm     4.15.0-1151.156
   linux-image-4.15.0-1161-gcp     4.15.0-1161.178
   linux-image-4.15.0-1167-aws     4.15.0-1167.180
   linux-image-4.15.0-1176-azure   4.15.0-1176.191
   linux-image-4.15.0-224-generic  4.15.0-224.236
   linux-image-4.15.0-224-lowlatency  4.15.0-224.236
   linux-image-aws-lts-18.04       4.15.0.1167.165
   linux-image-azure-lts-18.04     4.15.0.1176.144
   linux-image-gcp-lts-18.04       4.15.0.1161.174
   linux-image-generic             4.15.0.224.208
   linux-image-kvm                 4.15.0.1151.142
   linux-image-lowlatency          4.15.0.224.208
   linux-image-oracle-lts-18.04    4.15.0.1130.135
   linux-image-virtual             4.15.0.224.208

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1130-oracle  4.15.0-1130.141~16.04.1
   linux-image-4.15.0-1161-gcp     4.15.0-1161.178~16.04.1
   linux-image-4.15.0-1167-aws     4.15.0-1167.180~16.04.1
   linux-image-4.15.0-1176-azure   4.15.0-1176.191~16.04.1
   linux-image-4.15.0-224-generic  4.15.0-224.236~16.04.1
   linux-image-4.15.0-224-lowlatency  4.15.0-224.236~16.04.1
   linux-image-aws-hwe             4.15.0.1167.180~16.04.1
   linux-image-azure               4.15.0.1176.191~16.04.1
   linux-image-gcp                 4.15.0.1161.178~16.04.1
   linux-image-generic-hwe-16.04   4.15.0.224.236~16.04.1
   linux-image-gke                 4.15.0.1161.178~16.04.1
   linux-image-lowlatency-hwe-16.04  4.15.0.224.236~16.04.1
   linux-image-oem                 4.15.0.224.236~16.04.1
   linux-image-oracle              4.15.0.1130.141~16.04.1
   linux-image-virtual-hwe-16.04   4.15.0.224.236~16.04.1

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   linux-image-4.15.0-1176-azure   4.15.0-1176.191~14.04.1
   linux-image-azure               4.15.0.1176.191~14.04.1

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-6740-1
   CVE-2023-1382, CVE-2023-1838, CVE-2023-1998, CVE-2023-24023,
   CVE-2023-51043, CVE-2023-51779, CVE-2023-52429, CVE-2023-52445,
   CVE-2023-52451, CVE-2023-52464, CVE-2023-52600, CVE-2023-52603,
   CVE-2023-6915, CVE-2024-0639, CVE-2024-23851