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Ubuntu 18.04 AWS Kernel Important Privilege Escalation Flaws USN-8530-1

ubuntu
Calendar Grey July 10, 2026
Dist Ubuntu Esm H88
Multiple security flaws in Ubuntu's Linux kernel require updates to maintain system integrity and prevent threats.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-aws: Linux kernel for Amazon Web Services (AWS) systems

- linux-aws-fips: Linux kernel for Amazon Web Services (AWS) systems with FIPS

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)

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 com...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory privilege escalation Ubuntu important AWS linux-aws

Update Instructions

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

Ubuntu 18.04 LTS
  linux-image-4.15.0-1194-aws     4.15.0-1194.207
                                  Available with Ubuntu Pro
  linux-image-4.15.0-2132-aws-fips  4.15.0-2132.138
                                  Available with Ubuntu Pro
  linux-image-aws-4.15            4.15.0.1194.192
                                  Available with Ubuntu Pro
  linux-image-aws-fips            4.15.0.2132.126
                                  Available with Ubuntu Pro
  linux-image-aws-fips-4.15       4.15.0.2132.126
                                  Available with Ubuntu Pro
  linux-image-aws-lts-18.04       4.15.0.1194.192
                                  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-8530-1

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-2026-43284, 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
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8530-1

Topics%20covered

Topics Covered

security advisory privilege escalation Ubuntu important AWS linux-aws

Package Information

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