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Ubuntu 18.04: Significant VMSCAPE Details in Linux Kernel USN-7853-1

Several security issues were fixed in the Linux kernel.. ========================================================================== Ubuntu Security Notice USN-7853-1 October 30, 2025 linux, linux-aws, linux-aws-hwe, linux-gcp, linux-gcp-4.15, linux-hwe, linux-oracle vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems - linux-oracle: Linux kernel for Oracle Cloud systems - linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-hwe: Linux hardware enablement (HWE) kernel Details: Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi discovered that the Linux kernel contained insufficient branch predictor isolation between a guest and a userspace hypervisor for certain processors. This flaw is known as VMSCAPE. An attacker in a guest VM could possibly use this to expose sensitive information from the host OS. (CVE-2025-40300) 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 subsystems: - DMA engine subsystem; - GPU drivers; - HSI subsystem; - Ethernet team driver; - Ext4 file system; - Timer subsystem; - DCCP (Datagram Congestion Control Protocol); - IPv6 networking; - NET/ROM layer; - SCTP protocol; - USB sound devices; (CVE-2023-52574, CVE-2023-52650, CVE-2024-41006, CVE-2024-50006, CVE-2024-50299, CVE-2024-53124, CVE-2024-53150, CVE-2024-56767, CVE-2025-37838, CVE-2025-38352) Update instructions: The problem canbe corrected by updating your system to the following package versions: Ubuntu 18.04 LTS linux-image-4.15.0-1148-oracle 4.15.0-1148.159 Available with Ubuntu Pro linux-image-4.15.0-1179-gcp 4.15.0-1179.196 Available with Ubuntu Pro linux-image-4.15.0-1186-aws 4.15.0-1186.199 Available with Ubuntu Pro linux-image-4.15.0-243-generic 4.15.0-243.255 Available with Ubuntu Pro linux-image-4.15.0-243-lowlatency 4.15.0-243.255 Available with Ubuntu Pro linux-image-aws-4.15 4.15.0.1186.184 Available with Ubuntu Pro linux-image-aws-lts-18.04 4.15.0.1186.184 Available with Ubuntu Pro linux-image-gcp-4.15 4.15.0.1179.192 Available with Ubuntu Pro linux-image-gcp-lts-18.04 4.15.0.1179.192 Available with Ubuntu Pro linux-image-generic 4.15.0.243.227 Available with Ubuntu Pro linux-image-lowlatency 4.15.0.243.227 Available with Ubuntu Pro linux-image-oracle-4.15 4.15.0.1148.153 Available with Ubuntu Pro linux-image-oracle-lts-18.04 4.15.0.1148.153 Available with Ubuntu Pro linux-image-virtual 4.15.0.243.227 Available with Ubuntu Pro Ubuntu 16.04 LTS linux-image-4.15.0-1179-gcp 4.15.0-1179.196~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-1186-aws 4.15.0-1186.199~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-243-generic 4.15.0-243.255~16.04.1 Available with Ubuntu Pro linux-image-4.15.0-243-lowlatency 4.15.0-243.255~16.04.1 Available with Ubuntu Pro linux-image-aws-hwe 4.15.0.1186.199~16.04.1 Available with Ubuntu Pro linux-image-gcp 4.15.0.1179.196~16.04.1 Available with Ubuntu Pro linux-image-generic-hwe-16.04 4.15.0.243.255~16.04.1 Available with Ubuntu Pro linux-image-gke 4.15.0.1179.196~16.04.1 Available with Ubuntu Pro linux-image-lowlatency-hwe-16.04 4.15.0.243.255~16.04.1 Available with Ubuntu Pro linux-image-oem 4.15.0.243.255~16.04.1 Available with Ubuntu Pro linux-image-virtual-hwe-16.04 4.15.0.243.255~16.04.1 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-7853-1 CVE-2023-52574, CVE-2023-52650, CVE-2024-41006, CVE-2024-50006, CVE-2024-50299, CVE-2024-53124, CVE-2024-53150, CVE-2024-56767, CVE-2025-37838, CVE-2025-38352, CVE-2025-40300 . Update your Ubuntu systems to mitigate important kernel flaws affecting cloud deployments. Protect sensitive data now.. Ubuntu kernel update, Linux security issues, AWS GCP vulnerabilities, important Linux kernel patch, information disclosure. . Severity:Important. LinuxSecurity.com Team

Oct 30, 2025 •Important Ubuntu