--- title: 'USN-8177-2: Linux kernel (Real-time) vulnerabilities | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-8177-2 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-8177-2 --- # USN-8177-2: Linux kernel (Real-time) vulnerabilities Publication date 17 April 2026 Overview Several security issues were fixed in the Linux kernel. Releases [24.04 LTS](https://ubuntu.com/security/notices?release=noble) --- Open side navigation ## Packages * [linux-realtime-6.17](https://ubuntu.com/security/cves?package=linux-realtime-6.17) - Linux kernel for Real-time systems ## Details Josh Eads, Kristoffer Janke, Eduardo Vela Nava, Tavis Ormandy, and Matteo Rizzo discovered that some AMD Zen processors did not properly verify the signature of CPU microcode. This flaw is known as EntrySign. A privileged attacker could possibly use this issue to cause load malicious CPU microcode causing loss of integrity and confidentiality. ([CVE-2024-36347](https://ubuntu.com/security/CVE-2024-36347)) 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: * MIPS architecture; * PowerPC architecture; * User-Mode Linux (UML); * x86 architecture; * Block layer subsystem; * Cryptographic API; * ACPI drivers; * Ublk userspace block driver; * Bluetooth drivers; * Character device driver; * TPM device driver; * Clock framework and... --- Show more ## Update instructions After a standard system update you need to reboot your computer to make all the necessary changes. [Learn more about how to get the fixes.](https://ubuntu.com/security/cves/about#security) 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. The problem can be corrected by updating your system to the following package versions: | Ubuntu Release | Package Version | | --- | --- | | 24.04 LTS noble | [linux-image-6.17.0-1010-realtime](https://launchpad.net/ubuntu/+source/linux-signed-realtime-6.17) –  6.17.0-1010.11~24.04.1   Real-time | | | | [linux-image-realtime-6.17](https://launchpad.net/ubuntu/+source/linux-meta-realtime-6.17) –  6.17.0-1010.11~24.04.1   Real-time | | | | [linux-image-realtime-hwe-24.04](https://launchpad.net/ubuntu/+source/linux-meta-realtime-6.17) –  6.17.0-1010.11~24.04.1   Real-time | | | --- ### Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. [Get Ubuntu Pro](https://ubuntu.com/pro) ## References *Search* * [CVE-2026-23209](https://ubuntu.com/security/CVE-2026-23209) * [CVE-2026-23091](https://ubuntu.com/security/CVE-2026-23091) * [CVE-2025-71157](https://ubuntu.com/security/CVE-2025-71157) * [CVE-2025-71156](https://ubuntu.com/security/CVE-2025-71156) * [CVE-2025-71154](https://ubuntu.com/security/CVE-2025-71154) * [CVE-2025-71153](https://ubuntu.com/security/CVE-2025-71153) * [CVE-2025-71151](https://ubuntu.com/security/CVE-2025-71151) * [CVE-2025-71150](https://ubuntu.com/security/CVE-2025-71150) * [CVE-2025-71149](https://ubuntu.com/security/CVE-2025-71149) * [CVE-2025-71148](https://ubuntu.com/security/CVE-2025-71148) --- Show 129 more references ## Related notices id="usn" *Search* * [USN-8781-1](https://ubuntu.com/security/notices/USN-8781-1) * [USN-8668-1](https://ubuntu.com/security/notices/USN-8668-1) * [USN-8668-2](https://ubuntu.com/security/notices/USN-8668-2) * [USN-8665-1](https://ubuntu.com/security/notices/USN-8665-1) * [USN-8620-1](https://ubuntu.com/security/notices/USN-8620-1) * [USN-8620-2](https://ubuntu.com/security/notices/USN-8620-2) * [USN-8620-3](https://ubuntu.com/security/notices/USN-8620-3) * [USN-8620-4](https://ubuntu.com/security/notices/USN-8620-4) * [USN-8619-1](https://ubuntu.com/security/notices/USN-8619-1) * [USN-8610-1](https://ubuntu.com/security/notices/USN-8610-1) --- Show 77 more references --- Have additional questions? [Talk to a member of the team ›](https://wiki.ubuntu.com/SecurityTeam/FAQ?_ga=2.242131138.1744859116.1742138161-1500419473.1726851136&_gl=1*161muja*_gcl_au*MzUyMTIzNjI1LjE3MzYyNDQ4NTE.#Contact)