Ubuntu USN-8828-1 Fixes dracut Vulnerabilities
Tech GuruQuick Answer
USN-8828-1 fixes dracut issues affecting boot-image permissions and network configuration handling. Some involve untrusted DHCP data reaching privileged shell processing during boot. Check the notice's CVE-specific Ubuntu scope and prepare console recovery before changing boot images.
Confirm Scope And Apply The Supported Fix
Next step: Record the dracut packages and boot method, preserve a supported recovery path, and apply Canonical's release-matched update. Verify the required initramfs regeneration and reboot steps for the host rather than assuming a package installation alone changed its boot environment.
Last verified: 2026-09-28 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | dracut vulnerabilities on Ubuntu 26.04 LTS (resolute), Ubuntu 24.04 LTS (noble), Ubuntu 22.04 LTS (jammy), Ubuntu 20.04 ESM (focal), Ubuntu 18.04 ESM (bionic), Ubuntu 16.04 ESM (xenial) |
|---|---|
| Advisory | USN-8828-1 |
| CVEs | CVE-2016-8637, CVE-2026-15816, CVE-2026-16445, CVE-2026-6893 |
| Authoritative release date | 2026-09-28 13:33:37.853117 UTC |
| Authority revision date | No separate material revision date is stated by Ubuntu; verified against the first-party notice API. |
| Affected versions | The Ubuntu releases and source packages enumerated in USN-8828-1: Ubuntu 26.04 LTS (resolute), Ubuntu 24.04 LTS (noble), Ubuntu 22.04 LTS (jammy), Ubuntu 20.04 ESM (focal), Ubuntu 18.04 ESM (bionic), Ubuntu 16.04 ESM (xenial). |
| Fixed version | bionic: dracut 047-2ubuntu0.1~esm1 / focal: dracut 048+80-2ubuntu0.1~esm1 / jammy: dracut 051-1ubuntu0.1~esm1 / noble: dracut 060+5-1ubuntu3.4 / resolute: dracut 110-11ubuntu0.1 / xenial: dracut 044+3-3ubuntu0.1~esm1 |
| 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
The permissive-initramfs issue is listed for Ubuntu 16.04. The DHCP-related issues cover the stated older releases through 24.04, and a separate temporary-configuration issue is listed for 22.04. Package entries for a release do not imply every CVE has identical applicability there.
What To Validate Now
- Inventory. Record the Ubuntu release, enabled repositories, installed binary packages (including dracut and its installed companion packages), running consumers, and service owner. Check bundled application copies and container images separately.
- Establish applicability. Compare installed binary packages with USN-8828-1's release-specific package table. The source-package builds summarized above identify the advisory's source release; they are not literal package-install commands.
- Remediate. Follow Canonical's current update instructions for the affected binary packages on this Ubuntu release. Confirm security or Pro/ESM repository access as applicable. Do not install a source-package name merely because it appears in the summary table.
- Validate. Check update and initramfs-generation output, then verify a controlled reboot, encrypted-root unlocking where used, storage discovery, and required network boot behavior. Have console access available; do not test malicious DHCP on a shared or production network.
- 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
Some listed fixes are delivered through Ubuntu Pro or ESM. Confirm entitlement and repository state before the change, use the exact supported release stream, and test dependent services, clusters, and rollback. Severity alone is not evidence of exploitation.
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.
