==========================================================================
Ubuntu Security Notice USN-6972-1
August 21, 2024

linux, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

Yuxuan Hu discovered that the Bluetooth RFCOMM protocol driver in the Linux
Kernel contained a race condition, leading to a NULL pointer dereference.
An attacker could possibly use this to cause a denial of service (system
crash). (CVE-2024-22099)

It was discovered that a race condition existed in the Bluetooth subsystem
in the Linux kernel, leading to a null pointer dereference vulnerability. A
privileged local attacker could use this to possibly cause a denial of
service (system crash). (CVE-2024-24860)

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:
   - SuperH RISC architecture;
   - User-Mode Linux (UML);
   - GPU drivers;
   - MMC subsystem;
   - Network drivers;
   - PHY drivers;
   - Pin controllers subsystem;
   - Xen hypervisor drivers;
   - GFS2 file system;
   - Core kernel;
   - Bluetooth subsystem;
   - IPv4 networking;
   - IPv6 networking;
   - HD-audio driver;
   - ALSA SH drivers;
(CVE-2024-26903, CVE-2024-35835, CVE-2023-52644, CVE-2024-39292,
CVE-2024-36940, CVE-2024-26600, CVE-2023-52629, CVE-2024-35955,
CVE-2023-52760, CVE-2023-52806, CVE-2024-39484, CVE-2024-26679,
CVE-2024-26654, CVE-2024-36901, CVE-2024-26687, CVE-2023-52470)

Update instructions:

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

Ubuntu 18.04 LTS
   linux-image-4.15.0-1155-kvm     4.15.0-1155.160
                                   Available with Ubuntu Pro
   linux-image-4.15.0-1165-gcp     4.15.0-1165.182
                                   Available with Ubuntu Pro
   linux-image-4.15.0-228-generic  4.15.0-228.240
                                   Available with Ubuntu Pro
   linux-image-4.15.0-228-lowlatency  4.15.0-228.240
                                   Available with Ubuntu Pro
   linux-image-gcp-lts-18.04       4.15.0.1165.178
                                   Available with Ubuntu Pro
   linux-image-generic             4.15.0.228.212
                                   Available with Ubuntu Pro
   linux-image-kvm                 4.15.0.1155.146
                                   Available with Ubuntu Pro
   linux-image-lowlatency          4.15.0.228.212
                                   Available with Ubuntu Pro
   linux-image-virtual             4.15.0.228.212
                                   Available with Ubuntu Pro

Ubuntu 16.04 LTS
   linux-image-4.15.0-1165-gcp     4.15.0-1165.182~16.04.1
                                   Available with Ubuntu Pro
   linux-image-4.15.0-228-generic  4.15.0-228.240~16.04.1
                                   Available with Ubuntu Pro
   linux-image-4.15.0-228-lowlatency  4.15.0-228.240~16.04.1
                                   Available with Ubuntu Pro
   linux-image-gcp                 4.15.0.1165.182~16.04.1
                                   Available with Ubuntu Pro
   linux-image-generic-hwe-16.04   4.15.0.228.240~16.04.1
                                   Available with Ubuntu Pro
   linux-image-gke                 4.15.0.1165.182~16.04.1
                                   Available with Ubuntu Pro
   linux-image-lowlatency-hwe-16.04  4.15.0.228.240~16.04.1
                                   Available with Ubuntu Pro
   linux-image-oem                 4.15.0.228.240~16.04.1
                                   Available with Ubuntu Pro
   linux-image-virtual-hwe-16.04   4.15.0.228.240~16.04.1
                                   Available with Ubuntu Pro

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-6972-1
   CVE-2023-52470, CVE-2023-52629, CVE-2023-52644, CVE-2023-52760,
   CVE-2023-52806, CVE-2024-22099, CVE-2024-24860, CVE-2024-26600,
   CVE-2024-26654, CVE-2024-26679, CVE-2024-26687, CVE-2024-26903,
   CVE-2024-35835, CVE-2024-35955, CVE-2024-36901, CVE-2024-36940,
   CVE-2024-39292, CVE-2024-39484