Ubuntu alert USN-8390-1 (linux, linux-azure, linux-azure-4.15, linux-azure-fips, linux-fips, linux-gcp-4.15, linux-gcp-fips, linux-kvm, linux-oracle)
| From: | Rodrigo Figueiredo Zaiden via ubuntu-security-announce <ubuntu-security-announce@lists.ubuntu.com> | |
| To: | ubuntu-security-announce@lists.ubuntu.com | |
| Subject: | [USN-8390-1] Linux kernel vulnerability | |
| Date: | Thu, 04 Jun 2026 18:30:02 -0300 | |
| Message-ID: | <d77ff9e1-e626-4a5a-838b-c281d1138146@canonical.com> | |
| Cc: | Rodrigo Figueiredo Zaiden <rodrigo.zaiden@canonical.com> |
========================================================================== 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
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