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Ubuntu 25.10 Kernel Critical Security Flaws USN-8371-1 Escalation Issues

ubuntu
Calendar Grey June 2, 2026
Dist Ubuntu Esm H88
Security notice for Ubuntu highlights critical kernel issues impacting system integrity and requiring immediate updates.
Several security issues were fixed in the Linux kernel.

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-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi: Linux kernel for Raspberry Pi systems

- linux-realtime: Linux kernel for Real-time systems

- linux-azure-6.17: Linux kernel for Microsoft Azure cloud systems

- linux-hwe-6.17: Linux hardware enablement (HWE) kernel

- linux-nvidia-6.17: Linux kernel for NVIDIA systems

- linux-oem-6.17: Linux kernel for OEM systems

- linux-oracle-6.17: Linux kernel for Oracle Cloud systems

- linux-realtime-6.17: Linux kernel for Real-time systems

Details:

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 process...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical Ubuntu memory leak kernel escalation

Update Instructions

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

Ubuntu 25.10
   linux-image-6.17.0-1014-realtime  6.17.0-1014.16
   linux-image-6.17.0-1016-oracle  6.17.0-1016.16
   linux-image-6.17.0-1016-oracle-64k  6.17.0-1016.16
   linux-image-6.17.0-1017-aws     6.17.0-1017.17
   linux-image-6.17.0-1017-aws-64k  6.17.0-1017.17
   linux-image-6.17.0-1017-azure   6.17.0-1017.17
   linux-image-6.17.0-1018-raspi   6.17.0-1018.18
   linux-image-6.17.0-35-generic   6.17.0-35.35
   linux-image-6.17.0-35-generic-64k  6.17.0-35.35
   linux-image-aws                 6.17.0-1017.17
   linux-image-aws-6.17            6.17.0-1017.17
   linux-image-aws-64k             6.17.0-1017.17
   linux-image-aws-64k-6.17        6.17.0-1017.17
   linux-image-azure               6.17.0-1017.17
   linux-image-azure-6.17          6.17.0-1017.17
   linux-image-generic             6.17.0-35.35
   linux-image-generic-6.17        6.17.0-35.35
   linux-image-generic-64k         6.17.0-35.35
   linux-image-generic-64k-6.17    6.17.0-35.35
   linux-image-oracle              6.17.0-1016.16
   linux-image-oracle-6.17         6.17.0-1016.16
   linux-image-oracle-64k          6.17.0-1016.16
   linux-image-oracle-64k-6.17     6.17.0-1016.16
   linux-image-raspi               6.17.0-1018.18
   linux-image-raspi-6.17          6.17.0-1018.18
   linux-image-realtime            6.17.0-1014.16
   linux-image-realtime-6.17       6.17.0-1014.16
   linux-image-virtual             6.17.0-35.35
   linux-image-virtual-6.17        6.17.0-35.35

Ubuntu 24.04 LTS
   linux-image-6.17.0-1014-realtime  6.17.0-1014.16~24.04.1
                                   Available with Ubuntu Pro
   linux-image-6.17.0-1016-oracle  6.17.0-1016.16~24.04.1
   linux-image-6.17.0-1016-oracle-64k  6.17.0-1016.16~24.04.1
   linux-image-6.17.0-1017-azure   6.17.0-1017.17~24.04.1
   linux-image-6.17.0-1021-nvidia  6.17.0-1021.21
   linux-image-6.17.0-1021-nvidia-64k  6.17.0-1021.21
   linux-image-6.17.0-1024-oem     6.17.0-1024.24
   linux-image-6.17.0-35-generic   6.17.0-35.35~24.04.1
   linux-image-6.17.0-35-generic-64k  6.17.0-35.35~24.04.1
   linux-image-azure               6.17.0-1017.17~24.04.1
   linux-image-azure-6.17          6.17.0-1017.17~24.04.1
   linux-image-generic-6.17        6.17.0-35.35~24.04.1
   linux-image-generic-64k-6.17    6.17.0-35.35~24.04.1
   linux-image-generic-64k-hwe-24.04  6.17.0-35.35~24.04.1
   linux-image-generic-hwe-24.04   6.17.0-35.35~24.04.1
   linux-image-nvidia-6.17         6.17.0-1021.21
   linux-image-nvidia-64k-6.17     6.17.0-1021.21
   linux-image-nvidia-64k-hwe-24.04  6.17.0-1021.21
   linux-image-nvidia-hwe-24.04    6.17.0-1021.21
   linux-image-oem-24.04           6.17.0-1024.24
   linux-image-oem-24.04a          6.17.0-1024.24
   linux-image-oem-24.04b          6.17.0-1024.24
   linux-image-oem-24.04c          6.17.0-1024.24
   linux-image-oem-24.04d          6.17.0-1024.24
   linux-image-oem-6.17            6.17.0-1024.24
   linux-image-oracle              6.17.0-1016.16~24.04.1
   linux-image-oracle-6.17         6.17.0-1016.16~24.04.1
   linux-image-oracle-64k          6.17.0-1016.16~24.04.1
   linux-image-oracle-64k-6.17     6.17.0-1016.16~24.04.1
   linux-image-realtime-6.17       6.17.0-1014.16~24.04.1
                                   Available with Ubuntu Pro
   linux-image-realtime-hwe-24.04  6.17.0-1014.16~24.04.1
                                   Available with Ubuntu Pro
   linux-image-virtual-6.17        6.17.0-35.35~24.04.1
   linux-image-virtual-hwe-24.04   6.17.0-35.35~24.04.1

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-8371-1

CVE-2026-31676, CVE-2026-43284, CVE-2026-43494, CVE-2026-43500,

CVE-2026-43503, CVE-2026-45998, CVE-2026-46000, 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-8371-1

Topics%20covered

Topics Covered

security advisory critical Ubuntu memory leak kernel escalation

Package Information

https://launchpad.net/ubuntu/+source/linux/6.17.0-35.35
https://launchpad.net/ubuntu/+source/linux-aws/6.17.0-1017.17
https://launchpad.net/ubuntu/+source/linux-azure/6.17.0-1017.17
https://launchpad.net/ubuntu/+source/linux-oracle/6.17.0-1016.16
https://launchpad.net/ubuntu/+source/linux-raspi/6.17.0-1018.18
https://launchpad.net/ubuntu/+source/linux-realtime/6.17.0-1014.16
https://launchpad.net/ubuntu/+source/linux-azure-6.17/6.17.0-1017.17~24.04.1
https://launchpad.net/ubuntu/+source/linux-hwe-6.17/6.17.0-35.35~24.04.1
https://launchpad.net/ubuntu/+source/linux-nvidia-6.17/6.17.0-1021.21
https://launchpad.net/ubuntu/+source/linux-oem-6.17/6.17.0-1024.24
https://launchpad.net/ubuntu/+source/linux-oracle-6.17/6.17.0-1016.16~24.04.1
https://launchpad.net/ubuntu/+source/linux-realtime-6.17/6.17.0-1014.16~24.04.1

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