[USN-7455-3] Linux kernel (Real-time) vulnerabilities

[Giampaolo Fresi Roglia]

==========================================================================
Ubuntu Security Notice USN-7455-3
April 24, 2025

linux-intel-iot-realtime, linux-realtime vulnerabilities
==========================================================================

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

- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux-intel-iot-realtime: Linux kernel for Intel IoT Real-time platforms
- linux-realtime: Linux kernel for Real-time systems

Details:

Jann Horn discovered that the watch_queue event notification subsystem in
the Linux kernel contained an out-of-bounds write vulnerability. A local
attacker could use this to cause a denial of service (system crash) or
escalate their privileges. (CVE-2022-0995)

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:
  - Network drivers;
  - File systems infrastructure;
  - NTFS3 file system;
  - Ethernet bridge;
  - Ethtool driver;
  - IPv6 networking;
  - Network traffic control;
  - VMware vSockets driver;
(CVE-2024-56651, CVE-2025-21756, CVE-2024-26837, CVE-2025-21700,
CVE-2024-46826, CVE-2024-50256, CVE-2024-50248, CVE-2025-21993,
CVE-2025-21702, CVE-2025-21701, CVE-2025-21703)

Update instructions:

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

Ubuntu 22.04 LTS
  linux-image-5.15.0-1075-intel-iot-realtime  5.15.0-1075.77
                                  Available with Ubuntu Pro
  linux-image-5.15.0-1082-realtime  5.15.0-1082.91
                                  Available with Ubuntu Pro
  linux-image-intel-iot-realtime  5.15.0.1075.79
                                  Available with Ubuntu Pro
  linux-image-realtime            5.15.0.1082.86
                                  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-7455-3
  https://ubuntu.com/security/notices/USN-7455-2
  https://ubuntu.com/security/notices/USN-7455-1
  CVE-2022-0995, CVE-2024-26837, CVE-2024-46826, CVE-2024-50248,
  CVE-2024-50256, CVE-2024-56651, CVE-2025-21700, CVE-2025-21701,
  CVE-2025-21702, CVE-2025-21703, CVE-2025-21756, CVE-2025-21993

Package Information:
  https://launchpad.net/ubuntu/+source/linux-intel-iot-realtime/5.15.0-1075.77
  https://launchpad.net/ubuntu/+source/linux-realtime/5.15.0-1082.91

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