Ubuntu FIPS Kernel Update Fixes Twenty Vulnerabilities
Tech GuruQuick Answer
Ubuntu USN-8818-6 fixes twenty kernel vulnerabilities in the Ubuntu 22.04 LTS FIPS stream. The versioned binary is linux-image-5.15.0-194-fips 5.15.0-194.204+fips1, while the image metapackages use 5.15.0.194.113. Canonical lists these in fips-updates; the source package name alone is not an installation instruction.
Confirm Scope And Apply The Supported Fix
What to do now: Inventory Ubuntu 22.04 LTS FIPS kernel, match the exact affected release or feature, apply the authority-supported fixed build or service remediation, validate the dependent workflow, and preserve evidence.
Last verified: 2026-10-02 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | Ubuntu 22.04 LTS FIPS kernel |
|---|---|
| Advisory | USN-8818-6 |
| CVEs | CVE-2025-10263, CVE-2026-53186, CVE-2026-53216, CVE-2026-53221, CVE-2026-53354, CVE-2026-53355, CVE-2026-53398, CVE-2026-63800, CVE-2026-63808, CVE-2026-63887, CVE-2026-63888, CVE-2026-63912, CVE-2026-63922, CVE-2026-63924, CVE-2026-63984, CVE-2026-63992, CVE-2026-63993, CVE-2026-63994, CVE-2026-64007, CVE-2026-64091 |
| Authoritative release date | 2026-10-02 06:30:36.024869 UTC |
| Authority revision date | No separate material revision date is stated by Ubuntu; verified against the first-party notice API |
| Affected versions | The linux-fips source package on Ubuntu 22.04 LTS before the notice-listed build. |
| Fixed source build (not an install command) | Ubuntu 22.04 LTS: linux-fips 5.15.0-194.204+fips1 |
| CVSS base score | Not provided by the authority |
| CVSS severity | Not provided by the authority |
| Exploitation status | Not stated by the authority; no exploitation claim is inferred. |
What Changed
CVE-2025-10263 concerns some Arm processors completing TLB invalidation before associated writes are globally visible, potentially allowing a local attacker to bypass revoked memory permissions. The remaining set covers architecture, storage and network subsystems. Do not apply the Arm-specific condition indiscriminately to other architectures or reduce the whole advisory to that one issue.
Fixed Binary Packages
Canonical's notice API lists these visible binary fixes. Match installed packages; this is not an instruction to install every listed package.
- jammy:
linux-image-5.15.0-194-fips 5.15.0-194.204+fips1;linux-image-fips 5.15.0.194.113;linux-image-fips-5.15 5.15.0.194.113.
What To Validate Now
- Inventory. Locate Ubuntu 22.04 LTS FIPS kernel deployments, versions, enabled features, exposure paths, owners, and dependent services.
- Establish applicability. Match the installed Ubuntu release and binary packages to USN-8818-6. The source build identifies packaging provenance; it is not necessarily an installable package name. Do not transfer a version from another release or assume bundled upstream software is covered.
- Remediate. Use the entitled, approved fips-updates channel for the installed Ubuntu 22.04 FIPS kernel and applicable metapackages. Rebuild/reinstall affected third-party modules for the ABI change and reboot as required. Keep the compliance owner involved; do not switch to a generic kernel or silently change the approved cryptographic configuration to simplify patching.
- Validate. Verify the running FIPS kernel after reboot, required module loading and normal workload behavior. Retain repository, package and configuration evidence for compliance review. Installing this update does not by itself certify the entire machine or application.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
Canonical distinguishes security-updated FIPS packages from exact certification artifacts. Confirm the current certification scope and organizational requirements through the Ubuntu 22.04 FIPS guidance. Preserve boot recovery and the ABI warning; no compliance assessment or reboot test was performed here.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
