Ubuntu 26.04 LTS Major Privilege Escalation Vulnerabilities USN-8370-1

ubuntu

June 2, 2026

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

- linux-ibm: Linux kernel for IBM cloud systems

- linux-nvidia: Linux kernel for NVIDIA 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

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 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 discovered that a logic flaw existed in the XFRM ESP-in-TCP

...

Read the Full Advisory

Topics Covered

security advisory privilege escalation Ubuntu memory leak local attack kernel issue

Update Instructions

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

Ubuntu 26.04 LTS
   linux-image-7.0.0-1005-gcp      7.0.0-1005.5
   linux-image-7.0.0-1005-gcp-64k  7.0.0-1005.5
   linux-image-7.0.0-1005-oracle   7.0.0-1005.5
   linux-image-7.0.0-1005-oracle-64k  7.0.0-1005.5
   linux-image-7.0.0-1006-aws      7.0.0-1006.6
   linux-image-7.0.0-1006-aws-64k  7.0.0-1006.6
   linux-image-7.0.0-1007-ibm      7.0.0-1007.7
   linux-image-7.0.0-1009-nvidia   7.0.0-1009.9
   linux-image-7.0.0-1009-nvidia-64k  7.0.0-1009.9
   linux-image-7.0.0-1011-raspi    7.0.0-1011.11
   linux-image-7.0.0-1011-raspi-realtime  7.0.0-1011.11
   linux-image-7.0.0-22-generic    7.0.0-22.22
   linux-image-7.0.0-22-generic-64k  7.0.0-22.22
   linux-image-7.0.0-22-realtime   7.0.0-22.22.1
   linux-image-7.0.0-22-realtime-64k  7.0.0-22.22.1
   linux-image-aws                 7.0.0-1006.6
   linux-image-aws-64k             7.0.0-1006.6
   linux-image-aws-64k-7.0         7.0.0-1006.6
   linux-image-aws-7.0             7.0.0-1006.6
   linux-image-gcp                 7.0.0-1005.5
   linux-image-gcp-64k             7.0.0-1005.5
   linux-image-gcp-64k-7.0         7.0.0-1005.5
   linux-image-gcp-7.0             7.0.0-1005.5
   linux-image-generic             7.0.0-22.22
   linux-image-generic-64k         7.0.0-22.22
   linux-image-generic-64k-7.0     7.0.0-22.22
   linux-image-generic-64k-hwe-26.04  7.0.0-22.22
   linux-image-generic-7.0         7.0.0-22.22
   linux-image-generic-hwe-26.04   7.0.0-22.22
   linux-image-ibm                 7.0.0-1007.7
   linux-image-ibm-7.0             7.0.0-1007.7
   linux-image-nvidia              7.0.0-1009.9
   linux-image-nvidia-64k          7.0.0-1009.9
   linux-image-nvidia-64k-7.0      7.0.0-1009.9
   linux-image-nvidia-7.0          7.0.0-1009.9
   linux-image-oracle              7.0.0-1005.5
   linux-image-oracle-64k          7.0.0-1005.5
   linux-image-oracle-64k-7.0      7.0.0-1005.5
   linux-image-oracle-7.0          7.0.0-1005.5
   linux-image-raspi               7.0.0-1011.11
   linux-image-raspi-7.0           7.0.0-1011.11
   linux-image-raspi-realtime      7.0.0-1011.11
   linux-image-raspi-realtime-7.0  7.0.0-1011.11
   linux-image-realtime            7.0.0-22.22.1
   linux-image-realtime-64k        7.0.0-22.22.1
   linux-image-realtime-64k-7.0    7.0.0-22.22.1
   linux-image-realtime-64k-hwe-26.04  7.0.0-22.22.1
   linux-image-realtime-7.0        7.0.0-22.22.1
   linux-image-realtime-hwe-26.04  7.0.0-22.22.1
   linux-image-virtual             7.0.0-22.22
   linux-image-virtual-7.0         7.0.0-22.22
   linux-image-virtual-hwe-26.04   7.0.0-22.22

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.