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Ubuntu 25.10 Linux Kernel Critical Escalation Flaws 2026-31431

ubuntu
Calendar Grey June 2, 2026
Dist Ubuntu Esm H88
Multiple critical issues fixed in the Ubuntu Linux kernel elevate security risks. Essential updates are highly recommended.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-aws-6.17: Linux kernel for Amazon Web Services (AWS) systems

- linux-gcp-6.17: Linux kernel for Google Cloud Platform (GCP) systems

Details:

It was discovered that the Linux kernel algif_aead module did not properly

handle in-place cryptographic operations. This flaw is known as Copy Fail.

A local attacker could use this to escalate privileges, or possibly escape

a container. (CVE-2026-31431)

It was discovered that the Linux kernel did not properly handle shared page

fragments during socket buffer operations, collectively known as Dirty

Frag. A logic flaw existed in the XFRM ESP-in-TCP subsystem and in the

RxRPC networking subsystem when processing paged fragments. A local

attacker could use this to escalate privileges, or possibly escape a

container. (CVE-2026-43284, CVE-2026-43500, CVE-2026-45998, CVE-2026-46000)

It was disco...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu Linux kernel copy fail

Update Instructions

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

Ubuntu 25.10
   linux-image-6.17.0-1018-gcp     6.17.0-1018.19
   linux-image-6.17.0-1018-gcp-64k  6.17.0-1018.19
   linux-image-gcp                 6.17.0-1018.19
   linux-image-gcp-6.17            6.17.0-1018.19
   linux-image-gcp-64k             6.17.0-1018.19
   linux-image-gcp-64k-6.17        6.17.0-1018.19

Ubuntu 24.04 LTS
   linux-image-6.17.0-1017-aws     6.17.0-1017.17~24.04.1
   linux-image-6.17.0-1017-aws-64k  6.17.0-1017.17~24.04.1
   linux-image-6.17.0-1018-gcp     6.17.0-1018.19~24.04.1
   linux-image-6.17.0-1018-gcp-64k  6.17.0-1018.19~24.04.1
   linux-image-aws                 6.17.0-1017.17~24.04.1
   linux-image-aws-6.17            6.17.0-1017.17~24.04.1
   linux-image-aws-64k             6.17.0-1017.17~24.04.1
   linux-image-aws-64k-6.17        6.17.0-1017.17~24.04.1
   linux-image-gcp                 6.17.0-1018.19~24.04.1
   linux-image-gcp-6.17            6.17.0-1018.19~24.04.1
   linux-image-gcp-64k             6.17.0-1018.19~24.04.1
   linux-image-gcp-64k-6.17        6.17.0-1018.19~24.04.1

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-8374-1

CVE-2025-71088, CVE-2025-71090, CVE-2025-71127, CVE-2025-71134,

CVE-2025-71139, CVE-2025-71141, CVE-2025-71142, CVE-2025-71144,

CVE-2025-71152, CVE-2025-71155, CVE-2026-23274, CVE-2026-23351,

CVE-2026-23394, CVE-2026-31419, CVE-2026-31431, CVE-2026-31504,

CVE-2026-31533, CVE-2026-31676, CVE-2026-43033, CVE-2026-43077,

CVE-2026-43078, CVE-2026-43284, CVE-2026-43494, CVE-2026-43500,

CVE-2026-43503, CVE-2026-45966, CVE-2026-45998, CVE-2026-46000,

CVE-2026-46028, CVE-2026-46300, CVE-2026-46333, CVE-2026-47326,

CVE-2026-47327, CVE-2026-47328, CVE-2026-47329, CVE-2026-47330,

CVE-2026-47332, CVE-2026-47333, CVE-2026-47334, CVE-2026-47337

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8374-1

Topics%20covered

Topics Covered

security advisory critical DoS Ubuntu Linux kernel copy fail

Package Information

https://launchpad.net/ubuntu/+source/linux-gcp/6.17.0-1018.19
https://launchpad.net/ubuntu/+source/linux-aws-6.17/6.17.0-1017.17~24.04.1
https://launchpad.net/ubuntu/+source/linux-gcp-6.17/6.17.0-1018.19~24.04.1

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