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Ubuntu 22.04 Linux Kernel Critical Privilege Escalation Issues USN-8426-1

ubuntu
Calendar Grey June 11, 2026
Scroller Ubuntu Esm H88
Multiple security issues resolved in Linux kernel for Ubuntu affecting privilege escalation and container security.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure-fips: Linux kernel for Microsoft Azure Cloud systems with FIPS

- linux-azure-5.15: Linux kernel for Microsoft Azure cloud 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)

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

subsystem in the Linux kernel when hand...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical privilege escalation Ubuntu container escape linux-azure-fips

Update Instructions

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

Ubuntu 22.04 LTS
   linux-image-5.15.0-1114-azure-fips  5.15.0-1114.123+fips1
                                   Available with Ubuntu Pro
   linux-image-azure-fips          5.15.0.1114.99
                                   Available with Ubuntu Pro
   linux-image-azure-fips-5.15     5.15.0.1114.99
                                   Available with Ubuntu Pro

Ubuntu 20.04 LTS
   linux-image-5.15.0-1114-azure   5.15.0-1114.123~20.04.1
                                   Available with Ubuntu Pro
   linux-image-azure               5.15.0.1114.123~20.04.1
                                   Available with Ubuntu Pro
   linux-image-azure-5.15          5.15.0.1114.123~20.04.1
                                   Available with Ubuntu Pro
   linux-image-azure-cvm           5.15.0.1114.123~20.04.1
                                   Available with Ubuntu Pro

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-8426-1

CVE-2024-35862, CVE-2024-50060, CVE-2026-23274, CVE-2026-23351,

CVE-2026-31419, CVE-2026-31431, CVE-2026-31504, CVE-2026-31533,

CVE-2026-43033, CVE-2026-43077, CVE-2026-43078, CVE-2026-43284,

CVE-2026-43494, CVE-2026-43500, CVE-2026-43503, CVE-2026-46028,

CVE-2026-46300, CVE-2026-46333

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8426-1

Topics%20covered

Topics Covered

security advisory critical privilege escalation Ubuntu container escape linux-azure-fips

Package Information

https://launchpad.net/ubuntu/+source/linux-azure-fips/5.15.0-1114.123+fips1

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