========================================================================== Ubuntu Security Notice USN-8390-1 June 04, 2026
linux, linux-azure, linux-azure-4.15, linux-azure-fips, linux-fips, linux-gcp-4.15, linux-gcp-fips, linux-kvm, linux-oracle vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS - Ubuntu 14.04 LTS Summary: The system could be made to run programs as an administrator. 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
- linux-azure: Linux kernel for Microsoft Azure Cloud 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.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 18.04 LTS
linux-image-4.15.0-1148-fips 4.15.0-1148.160
Available with Ubuntu Pro
linux-image-4.15.0-1155-oracle 4.15.0-1155.166
Available with Ubuntu Pro
linux-image-4.15.0-1175-kvm 4.15.0-1175.180
Available with Ubuntu Pro
linux-image-4.15.0-1186-gcp 4.15.0-1186.203
Available with Ubuntu Pro
linux-image-4.15.0-1202-azure 4.15.0-1202.217
Available with Ubuntu Pro
linux-image-4.15.0-2094-gcp-fips 4.15.0-2094.100
Available with Ubuntu Pro
linux-image-4.15.0-2111-azure-fips 4.15.0-2111.117
Available with Ubuntu Pro
linux-image-4.15.0-251-generic 4.15.0-251.263
Available with Ubuntu Pro
linux-image-4.15.0-251-lowlatency 4.15.0-251.263
Available with Ubuntu Pro
linux-image-azure-4.15 4.15.0.1202.170
Available with Ubuntu Pro
linux-image-azure-fips 4.15.0.2111.107
Available with Ubuntu Pro
linux-image-azure-fips-4.15 4.15.0.2111.107
Available with Ubuntu Pro
linux-image-azure-lts-18.04 4.15.0.1202.170
Available with Ubuntu Pro
linux-image-fips 4.15.0.1148.145
Available with Ubuntu Pro
linux-image-gcp-4.15 4.15.0.1186.199
Available with Ubuntu Pro
linux-image-gcp-fips 4.15.0.2094.92
Available with Ubuntu Pro
linux-image-gcp-fips-4.15 4.15.0.2094.92
Available with Ubuntu Pro
linux-image-gcp-lts-18.04 4.15.0.1186.199
Available with Ubuntu Pro
linux-image-generic 4.15.0.251.235
Available with Ubuntu Pro
linux-image-kvm 4.15.0.1175.166
Available with Ubuntu Pro
linux-image-lowlatency 4.15.0.251.235
Available with Ubuntu Pro
linux-image-oracle-4.15 4.15.0.1155.160
Available with Ubuntu Pro
linux-image-oracle-lts-18.04 4.15.0.1155.160
Available with Ubuntu Pro
linux-image-virtual 4.15.0.251.235
Available with Ubuntu Pro
Ubuntu 14.04 LTS
linux-image-4.15.0-1202-azure 4.15.0-1202.217~14.04.1
Available with Ubuntu Pro
linux-image-azure 4.15.0.1202.217~14.04.1
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-8390-1
CVE-2026-43284
OpenPGP_signature.asc
Description: OpenPGP digital signature
