==========================================================================
Ubuntu Security Notice USN-7234-2
January 30, 2025

linux-hwe-5.4 vulnerabilities
==========================================================================

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

- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-hwe-5.4: Linux hardware enablement (HWE) kernel

Details:

Ye Zhang and Nicolas Wu discovered that the io_uring subsystem in the Linux
kernel did not properly handle locking for rings with IOPOLL, leading to a
double-free vulnerability. A local attacker could use this to cause a
denial of service (system crash) or possibly execute arbitrary code.
(CVE-2023-21400)

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:
   - TTY drivers;
   - Netfilter;
   - Network traffic control;
   - VMware vSockets driver;
(CVE-2024-53141, CVE-2024-53103, CVE-2024-40967, CVE-2024-53164)

Update instructions:

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

Ubuntu 18.04 LTS
   linux-image-5.4.0-205-generic   5.4.0-205.225~18.04.1
                                   Available with Ubuntu Pro
   linux-image-5.4.0-205-lowlatency  5.4.0-205.225~18.04.1
                                   Available with Ubuntu Pro
   linux-image-generic-hwe-18.04   5.4.0.205.225~18.04.1
                                   Available with Ubuntu Pro
   linux-image-lowlatency-hwe-18.04  5.4.0.205.225~18.04.1
                                   Available with Ubuntu Pro
   linux-image-oem                 5.4.0.205.225~18.04.1
                                   Available with Ubuntu Pro
   linux-image-oem-osp1            5.4.0.205.225~18.04.1
                                   Available with Ubuntu Pro
   linux-image-snapdragon-hwe-18.04  5.4.0.205.225~18.04.1
                                   Available with Ubuntu Pro
   linux-image-virtual-hwe-18.04   5.4.0.205.225~18.04.1
                                   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-7234-2
   https://ubuntu.com/security/notices/USN-7234-1
   CVE-2023-21400, CVE-2024-40967, CVE-2024-53103, CVE-2024-53141,
   CVE-2024-53164