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

ubuntu
Calendar Grey June 11, 2026
Dist 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

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS 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, CV...

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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