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Ubuntu 25.10 Linux Kernel Critical Flaw Attack Fix USN-8177-1

ubuntu
Calendar Grey April 16, 2026
Dist Ubuntu Esm H88
Several security issues fixed in Ubuntu Linux kernel, including critical flaws allowing potential system compromise. Update now!
Several security issues were fixed in the Linux kernel.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.10 Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux: Linux kernel - linux-realtime: 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) 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 bloc...

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Topics%20covered

Topics Covered

security advisory critical Ubuntu attack system compromise Linux kernel

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 25.10 linux-image-6.17.0-1010-realtime 6.17.0-1010.11 Available with Ubuntu Pro linux-image-6.17.0-22-generic 6.17.0-22.22 linux-image-6.17.0-22-generic-64k 6.17.0-22.22 linux-image-generic 6.17.0-22.22 linux-image-generic-6.17 6.17.0-22.22 linux-image-generic-64k 6.17.0-22.22 linux-image-generic-64k-6.17 6.17.0-22.22 linux-image-realtime 6.17.0-1010.11 Available with Ubuntu Pro linux-image-realtime-6.17 6.17.0-1010.11 Available with Ubuntu Pro linux-image-virtual 6.17.0-22.22 linux-image-virtual-6.17 6.17.0-22.22 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-8177-1

CVE-2024-36347, CVE-2025-68351, CVE-2025-68353, CVE-2025-68365,

CVE-2025-68368, CVE-2025-68725, CVE-2025-68736, CVE-2025-68745,

CVE-2025-68767, CVE-2025-68768, CVE-2025-68769, CVE-2025-68770,

CVE-2025-68771, CVE-2025-68772, CVE-2025-68773, CVE-2025-68774,

CVE-2025-68775, CVE-2025-68776, CVE-2025-68777, CVE-2025-68778,

CVE-2025-68780, CVE-2025-68781, CVE-2025-68782, CVE-2025-68783,

CVE-2025-68784, CVE-2025-68785, CVE-2025-68786, CVE-2025-68787,

CVE-2025-68788, CVE-2025-68791, CVE-2025-68792, CVE-2025-68793,

CVE-2025-68794, CVE-2025-68795, CVE-2025-68796, CVE-2025-68797,

CVE-2025-68798, CVE-2025-68799, CVE-2025-68800, CVE-2025-68801,

CVE-2025-68802, CVE-2025-68803, CVE-2025-68804, CVE-2025-68805,

CVE-2025-68806, CVE-2025-68807, CVE-2025-68808, CVE-2025-68809,

CVE-2025-68810, CVE-2025-68811, CVE-2025-68813, CVE-2025-68814,

CVE-2025-68815, CVE-2025-68816, CVE-2025-68817, CVE-2025-68818,

CVE-2025-68819, CVE-2025-68820, CVE-2025-68821, CVE-2025-68822,

CVE-2025-68823, CVE-2025-71064, CVE-2025-71065, CVE-2025-71066,

CVE-2025-71067, CVE-2025-71068, CVE-2025-71069, CVE-2025-71070,

CVE-2025-71071, CVE-2025-71072, CVE-2025-71073, CVE-2025-71075,

CVE-2025-71076, CVE-2025-71077, CVE-2025-71078, CVE-2025-71079,

CVE-2025-71080, CVE-2025-71081, CVE-2025-71082, CVE-2025-71083,

CVE-2025-71084, CVE-2025-71085, CVE-2025-71086, CVE-2025-71087,

CVE-2025-71089, CVE-2025-71091, CVE-2025-71093, CVE-2025-71094,

CVE-2025-71095, CVE-2025-71096, CVE-2025-71097, CVE-2025-71098,

CVE-2025-71099, CVE-2025-71100, CVE-2025-71101, CVE-2025-71102,

CVE-2025-71104, CVE-2025-71105, CVE-2025-71107, CVE-2025-71108,

CVE-2025-71109, CVE-2025-71111, CVE-2025-71112, CVE-2025-71113,

CVE-2025-71114, CVE-2025-71115, CVE-2025-71116, CVE-2025-71117,

CVE-2025-71118, CVE-2025-71119, CVE-2025-71120, CVE-2025-71121,

CVE-2025-71122, CVE-2025-71123, CVE-2025-71124, CVE-2025-71125,

CVE-2025-71126, CVE-2025-71130, CVE-2025-71131, CVE-2025-71132,

CVE-2025-71133, CVE-2025-71135, CVE-2025-71136, CVE-2025-71137,

CVE-2025-71138, CVE-2025-71140, CVE-2025-71143, CVE-2025-71146,

CVE-2025-71147, CVE-2025-71148, CVE-2025-71149, CVE-2025-71150,

CVE-2025-71151, CVE-2025-71153, CVE-2025-71154, CVE-2025-71156,

CVE-2025-71157, CVE-2026-23091, CVE-2026-23209

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8177-1

Topics%20covered

Topics Covered

security advisory critical Ubuntu attack system compromise Linux kernel

Package Information

https://launchpad.net/ubuntu/+source/linux/6.17.0-22.22 https://launchpad.net/ubuntu/+source/linux-realtime/6.17.0-1010.11

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