Explore top 10 tips to secure your open-source projects now. Read More

×
Alerts This Week
Warning Icon 1 543
Alerts This Week
Warning Icon 1 543

Ubuntu 18.04 Linux Kernel Critical Flaw Privilege Escalation USN-8529-1

ubuntu
Calendar Grey July 10, 2026
Dist Ubuntu Esm H88
Several security issues in Ubuntu's Linux kernel fixed with crucial updates. Critical patches necessary for system protection.
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-azure-4.15: Linux kernel for Microsoft Azure Cloud systems

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

- linux-fips: Linux kernel with FIPS

- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems

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

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

Details:

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

subsystem in the Linux kernel when handling socket buffer fragments. This

flaw is known as Fragnesia. A local attacker could use this to escalate

privileges, or possibly escape a container. (CVE-2026-43503)

Several security issues were discovered in the Linux kernel.

An attacker could possibly use these to compromise the system.

This update corrects flaws in the following subsy...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory critical privilege escalation Ubuntu Linux kernel logic flaw

Update Instructions

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

Ubuntu 18.04 LTS
  linux-image-4.15.0-1149-fips    4.15.0-1149.161
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1156-oracle  4.15.0-1156.167
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1176-kvm     4.15.0-1176.181
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1187-gcp     4.15.0-1187.204
                                  Available with Ubuntu Pro
  linux-image-4.15.0-1204-azure   4.15.0-1204.219
                                  Available with Ubuntu Pro
  linux-image-4.15.0-2095-gcp-fips  4.15.0-2095.101
                                  Available with Ubuntu Pro
  linux-image-4.15.0-2112-azure-fips  4.15.0-2112.118
                                  Available with Ubuntu Pro
  linux-image-4.15.0-253-generic  4.15.0-253.265
                                  Available with Ubuntu Pro
  linux-image-4.15.0-253-lowlatency  4.15.0-253.265
                                  Available with Ubuntu Pro
  linux-image-azure-4.15          4.15.0.1204.172
                                  Available with Ubuntu Pro
  linux-image-azure-fips          4.15.0.2112.108
                                  Available with Ubuntu Pro
  linux-image-azure-fips-4.15     4.15.0.2112.108
                                  Available with Ubuntu Pro
  linux-image-azure-lts-18.04     4.15.0.1204.172
                                  Available with Ubuntu Pro
  linux-image-fips                4.15.0.1149.146
                                  Available with Ubuntu Pro
  linux-image-gcp-4.15            4.15.0.1187.200
                                  Available with Ubuntu Pro
  linux-image-gcp-fips            4.15.0.2095.93
                                  Available with Ubuntu Pro
  linux-image-gcp-fips-4.15       4.15.0.2095.93
                                  Available with Ubuntu Pro
  linux-image-gcp-lts-18.04       4.15.0.1187.200
                                  Available with Ubuntu Pro
  linux-image-generic             4.15.0.253.237
                                  Available with Ubuntu Pro
  linux-image-kvm                 4.15.0.1176.167
                                  Available with Ubuntu Pro
  linux-image-lowlatency          4.15.0.253.237
                                  Available with Ubuntu Pro
  linux-image-oracle-4.15         4.15.0.1156.161
                                  Available with Ubuntu Pro
  linux-image-oracle-lts-18.04    4.15.0.1156.161
                                  Available with Ubuntu Pro
  linux-image-virtual             4.15.0.253.237
                                  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-8529-1

CVE-2021-47202, CVE-2024-56643, CVE-2026-23272, CVE-2026-23455,

CVE-2026-31402, CVE-2026-31607, CVE-2026-31637, CVE-2026-31659,

CVE-2026-31682, CVE-2026-31685, CVE-2026-43011, CVE-2026-43037,

CVE-2026-43038, CVE-2026-43383, CVE-2026-43407, CVE-2026-43414,

CVE-2026-43503, CVE-2026-45988, CVE-2026-46043, CVE-2026-46119,

CVE-2026-46243

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8529-1

Topics%20covered

Topics Covered

security advisory critical privilege escalation Ubuntu Linux kernel logic flaw

Package Information

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.