[USN-7489-1] Linux kernel vulnerability

[Giampaolo Fresi Roglia]

==========================================================================
Ubuntu Security Notice USN-7489-1
May 06, 2025

linux, linux-aws, linux-gcp, linux-gcp-6.11, linux-hwe-6.11,
linux-lowlatency, linux-lowlatency-hwe-6.11, linux-oracle, linux-raspi
vulnerability
==========================================================================

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

- Ubuntu 24.10
- Ubuntu 24.04 LTS

Summary:

The system could be made to crash under certain conditions.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-lowlatency: Linux low latency kernel
- linux-oracle: Linux kernel for Oracle Cloud systems
- linux-raspi: Linux kernel for Raspberry Pi systems
- linux-gcp-6.11: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe-6.11: Linux hardware enablement (HWE) kernel
- linux-lowlatency-hwe-6.11: Linux low latency kernel

Details:

A security issue was discovered in the Linux kernel.
An attacker could possibly use this to compromise the system.
This update corrects flaws in the following subsystems:
  - Timer subsystem;
(CVE-2025-21813)

Update instructions:

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

Ubuntu 24.10
  linux-image-6.11.0-1012-raspi   6.11.0-1012.12
  linux-image-6.11.0-1013-aws     6.11.0-1013.14
  linux-image-6.11.0-1013-lowlatency  6.11.0-1013.14
  linux-image-6.11.0-1013-lowlatency-64k  6.11.0-1013.14
  linux-image-6.11.0-1014-gcp     6.11.0-1014.14
  linux-image-6.11.0-1014-gcp-64k  6.11.0-1014.14
  linux-image-6.11.0-1015-oracle  6.11.0-1015.16
  linux-image-6.11.0-1015-oracle-64k  6.11.0-1015.16
  linux-image-6.11.0-25-generic   6.11.0-25.25
  linux-image-6.11.0-25-generic-64k  6.11.0-25.25
  linux-image-aws                 6.11.0-1013.14
  linux-image-gcp                 6.11.0-1014.14
  linux-image-gcp-64k             6.11.0-1014.14
  linux-image-generic             6.11.0-25.25
  linux-image-generic-64k         6.11.0-25.25
  linux-image-lowlatency          6.11.0-1013.14
  linux-image-lowlatency-64k      6.11.0-1013.14
  linux-image-oracle              6.11.0-1015.16
  linux-image-oracle-64k          6.11.0-1015.16
  linux-image-raspi               6.11.0-1012.12
  linux-image-virtual             6.11.0-25.25

Ubuntu 24.04 LTS
  linux-image-6.11.0-1013-lowlatency  6.11.0-1013.14~24.04.1
  linux-image-6.11.0-1013-lowlatency-64k  6.11.0-1013.14~24.04.1
  linux-image-6.11.0-1014-gcp     6.11.0-1014.14~24.04.1
  linux-image-6.11.0-1014-gcp-64k  6.11.0-1014.14~24.04.1
  linux-image-6.11.0-25-generic   6.11.0-25.25~24.04.1
  linux-image-6.11.0-25-generic-64k  6.11.0-25.25~24.04.1
  linux-image-gcp                 6.11.0-1014.14~24.04.1
  linux-image-gcp-64k             6.11.0-1014.14~24.04.1
  linux-image-generic-64k-hwe-24.04  6.11.0-25.25~24.04.1
  linux-image-generic-hwe-24.04   6.11.0-25.25~24.04.1
  linux-image-lowlatency-64k-hwe-24.04  6.11.0-1013.14~24.04.1
  linux-image-lowlatency-hwe-24.04  6.11.0-1013.14~24.04.1
  linux-image-virtual-hwe-24.04   6.11.0-25.25~24.04.1

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-7489-1
  CVE-2025-21813

Package Information:
  https://launchpad.net/ubuntu/+source/linux/6.11.0-25.25
  https://launchpad.net/ubuntu/+source/linux-aws/6.11.0-1013.14
  https://launchpad.net/ubuntu/+source/linux-gcp/6.11.0-1014.14
  https://launchpad.net/ubuntu/+source/linux-lowlatency/6.11.0-1013.14
  https://launchpad.net/ubuntu/+source/linux-oracle/6.11.0-1015.16
  https://launchpad.net/ubuntu/+source/linux-raspi/6.11.0-1012.12
  https://launchpad.net/ubuntu/+source/linux-gcp-6.11/6.11.0-1014.14~24.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe-6.11/6.11.0-25.25~24.04.1
  https://launchpad.net/ubuntu/+source/linux-lowlatency-hwe-6.11/6.11.0-1013.14~24.04.1

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