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==========================================================================
Ubuntu Security Notice USN-7506-4
May 13, 2025

linux-lts-xenial vulnerabilities
==========================================================================

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

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Demi Marie Obenour and Simon Gaiser discovered that several Xen para-
virtualization device frontends did not properly restrict the access rights
of device backends. An attacker could possibly use a malicious Xen backend
to gain access to memory pages of a guest VM or cause a denial of service
in the guest. (CVE-2022-23041)

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:
  - Hardware crypto device drivers;
  - GPU drivers;
  - IIO subsystem;
  - Media drivers;
  - Network drivers;
  - SCSI subsystem;
  - SPI subsystem;
  - USB Gadget drivers;
  - Ceph distributed file system;
  - File systems infrastructure;
  - JFS file system;
  - Network file system (NFS) client;
  - Network file system (NFS) server daemon;
  - NILFS2 file system;
  - SMB network file system;
  - CAN network layer;
  - IPv6 networking;
  - MAC80211 subsystem;
  - Netfilter;
  - Netlink;
  - Network traffic control;
  - SCTP protocol;
  - TIPC protocol;
(CVE-2024-46771, CVE-2021-47500, CVE-2024-56631, CVE-2021-47219,
CVE-2021-47163, CVE-2024-50256, CVE-2024-56650, CVE-2024-46780,
CVE-2021-47506, CVE-2024-26996, CVE-2025-21971, CVE-2021-47587,
CVE-2021-47245, CVE-2024-56598, CVE-2021-46959, CVE-2024-26974,
CVE-2024-56642, CVE-2023-52741, CVE-2021-47150, CVE-2024-53173,
CVE-2024-26915, CVE-2024-36934, CVE-2024-56770, CVE-2024-53063,
CVE-2021-47191, CVE-2024-26689, CVE-2024-53066, CVE-2024-35864,
CVE-2024-50237, CVE-2024-53140, CVE-2024-49944)

Update instructions:

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

Ubuntu 14.04 LTS
  linux-image-4.4.0-268-generic   4.4.0-268.302~14.04.1
                                  Available with Ubuntu Pro
  linux-image-4.4.0-268-lowlatency  4.4.0-268.302~14.04.1
                                  Available with Ubuntu Pro
  linux-image-generic-lts-xenial  4.4.0.268.302~14.04.1
                                  Available with Ubuntu Pro
  linux-image-lowlatency-lts-xenial  4.4.0.268.302~14.04.1
                                  Available with Ubuntu Pro
  linux-image-virtual-lts-xenial  4.4.0.268.302~14.04.1
                                  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-7506-4
  https://ubuntu.com/security/notices/USN-7506-3
  https://ubuntu.com/security/notices/USN-7506-2
  https://ubuntu.com/security/notices/USN-7506-1
  CVE-2021-46959, CVE-2021-47150, CVE-2021-47163, CVE-2021-47191,
  CVE-2021-47219, CVE-2021-47245, CVE-2021-47500, CVE-2021-47506,
  CVE-2021-47587, CVE-2022-23041, CVE-2023-52741, CVE-2024-26689,
  CVE-2024-26915, CVE-2024-26974, CVE-2024-26996, CVE-2024-35864,
  CVE-2024-36934, CVE-2024-46771, CVE-2024-46780, CVE-2024-49944,
  CVE-2024-50237, CVE-2024-50256, CVE-2024-53063, CVE-2024-53066,
  CVE-2024-53140, CVE-2024-53173, CVE-2024-56598, CVE-2024-56631,
  CVE-2024-56642, CVE-2024-56650, CVE-2024-56770, CVE-2025-21971


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