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[USN-7906-1] Linux kernel vulnerabilities

Posted on 03 December 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7906-1
December 03, 2025

linux, linux-aws, linux-realtime vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-realtime: Linux kernel for Real-time systems

Details:

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:
- x86 architecture;
- Cryptographic API;
- Android drivers;
- TTY drivers;
- F2FS file system;
- 9P file system network protocol;
(CVE-2025-40025, CVE-2025-40026, CVE-2025-40027, CVE-2025-40028,
CVE-2025-40108, CVE-2025-40109)

Update instructions:

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

Ubuntu 25.10
linux-image-6.17.0-1003-realtime 6.17.0-1003.4
linux-image-6.17.0-1004-aws 6.17.0-1004.4
linux-image-6.17.0-1004-aws-64k 6.17.0-1004.4
linux-image-6.17.0-7-generic 6.17.0-7.7
linux-image-6.17.0-7-generic-64k 6.17.0-7.7
linux-image-aws 6.17.0-1004.4
linux-image-aws-6.17 6.17.0-1004.4
linux-image-aws-64k 6.17.0-1004.4
linux-image-aws-64k-6.17 6.17.0-1004.4
linux-image-generic 6.17.0-7.7
linux-image-generic-6.17 6.17.0-7.7
linux-image-generic-64k 6.17.0-7.7
linux-image-generic-64k-6.17 6.17.0-7.7
linux-image-generic-64k-hwe-24.04 6.17.0-7.7
linux-image-generic-hwe-24.04 6.17.0-7.7
linux-image-oem-24.04 6.17.0-7.7
linux-image-oem-24.04c 6.17.0-7.7
linux-image-realtime 6.17.0-1003.4
linux-image-realtime-6.17 6.17.0-1003.4
linux-image-realtime-hwe-24.04 6.17.0-1003.4
linux-image-virtual 6.17.0-7.7
linux-image-virtual-6.17 6.17.0-7.7
linux-image-virtual-hwe-24.04 6.17.0-7.7

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-7906-1
CVE-2025-40025, CVE-2025-40026, CVE-2025-40027, CVE-2025-40028,
CVE-2025-40108, CVE-2025-40109

Package Information:
https://launchpad.net/ubuntu/+source/linux/6.17.0-7.7
https://launchpad.net/ubuntu/+source/linux-aws/6.17.0-1004.4
https://launchpad.net/ubuntu/+source/linux-realtime/6.17.0-1003.4


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