Ubuntu USN-8793-2 Fixes Linux kernel (Azure CVM) Vulnerabilities
Tech GuruQuick Answer
USN-8793-2 updates the Azure CVM kernel on Ubuntu 22.04 to 6.8.0-1065.72~22.04.1. Use the Jammy Azure FDE image, not the separate 7.0 builds for newer Ubuntu releases, and reboot after installation.
Confirm Scope And Apply The Supported Fix
What to do now: Confirm the Ubuntu release, current azure-fde image and recovery access, then apply the supported 6.8 update with the required module/ABI checks before reboot.
Source check: 2026-10-02 UTC. This notice reflects the primary-source evidence described below, not a completed update or exploitation test. Recheck the advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | Linux kernel (Azure CVM) packages on Ubuntu 22.04 LTS (jammy) |
|---|---|
| Advisory | USN-8793-2 |
| CVEs | CVE-2025-71289, CVE-2026-23469, CVE-2026-31420, CVE-2026-31486, CVE-2026-31560, CVE-2026-46158, CVE-2026-46170, CVE-2026-46275, CVE-2026-46315 |
| Authoritative release date | 2026-09-22 (Canonical publication date; no time specified) |
| Authority revision date | No separate USN revision timestamp verified. The former precise imported timestamp is not established as an advisory revision. |
| Affected versions | The Ubuntu releases and packages enumerated in USN-8793-2: Ubuntu 22.04 LTS (jammy). |
| Fixed version | Ubuntu 22.04 jammy: linux-image-6.8.0-1065-azure-fde, linux-image-azure-fde and linux-image-azure-fde-6.8, version 6.8.0-1065.72~22.04.1. Source package: linux-azure-fde-6.8. |
| CVSS base score | Not provided by the authority |
| CVSS severity | Not provided by the authority |
| Exploitation status | USN-8793-2 does not state that these flaws are being exploited. That is not confirmation that exploitation has not occurred. |
What Changed
Canonical lists fixes in Bluetooth, GPU, hardware-monitoring, SPI, NTFS3, io_uring, Ethernet bridge and Multipath TCP code. The nine CVEs have subsystem-specific exposure; the Azure CVM package target remains the Jammy 6.8 branch.
What To Validate Now
- Inventory. Locate Linux kernel (Azure CVM) packages on Ubuntu 22.04 LTS (jammy) deployments, versions, enabled features, exposure paths, owners, and dependent services.
- Establish applicability. Compare each deployment with the authority's affected-version statement: The Ubuntu releases and packages enumerated in USN-8793-2: Ubuntu 22.04 LTS (jammy). Do not infer applicability from product family or severity alone.
- Remediate. Apply the Jammy Azure FDE6.8 image and metapackage update from the supported repository, then reboot through the approved CVM maintenance/recovery procedure. Preserve the ~22.04.1 package suffix.
- Validate. Verify the running 6.8.0-1065-azure-fde kernel and installed package suffix after reboot. Check confidential-VM boot/storage, networking, required modules and representative application health.
- 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 requires a reboot after this kernel update and warns of an ABI change. Recompile and reinstall any third-party kernel modules for the new ABI, and verify that this succeeds before relying on them after reboot. Keeping the standard kernel metapackages installed allows the normal upgrade to bring in the new kernel; it is not proof that every external driver rebuilt successfully. Check boot/recovery access, required drivers and rollback before broad rollout.
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.
