# Drivers: hv: vmbus: Skip VMBus module cleanup for non-nested root partition

CVE record · `CVE-2026-90097`

- **Identifiers:** `CVE-2026-90097`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:06 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `7e279d78664aa91107ebff4b03eca367967f5908 to before 321f650493d6b8169dacd4d5d6f63550dce54d6c` (git)
  - affected: `7e279d78664aa91107ebff4b03eca367967f5908 to before 4cc1ba2b31065a48fde14e9d53ad399a3ca32e35` (git)
  - affected: `7e279d78664aa91107ebff4b03eca367967f5908 to before ca1f4a926d08035c52c735a42200e4e5ea548f32` (git)
  - affected: `7e279d78664aa91107ebff4b03eca367967f5908 to before aa17842bbccaeaba7d05c166019d1c96a41bca54` (git)
  - affected: `7e279d78664aa91107ebff4b03eca367967f5908 to before 4c19c302cc577bd6b466f6d8e97971777392c2fa` (git)
  - affected: `7e279d78664aa91107ebff4b03eca367967f5908 to before cee0d90bceae1dee3bcc70f8d6b2ceb5b87deb42` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.12`
  - unaffected: `before 5.12` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.6 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Linux kernel: the Hyper-V VMBus driver (hv_vmbus) is affected in the root partition when it is not nested inside another VM. The VMBus module loads there but is never initialized, so unloading it later tries to clean up uninitialized state, causing memory faults and a kernel panic. The source gives few details on who can trigger the unload. Upgrade to a fixed kernel version: 6.1.191 or later in the 6.1 series, 6.6.160 or later in 6.6, 6.12.114 or later in 6.12, or 6.18.52 or later in 6.18. No fix is listed for 5.12 or later kernels not in those series.

Written 12 Nov 2026.

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0021, the 11th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90097](https://www.cve.org/CVERecord?id=CVE-2026-90097)
- [NVD: CVE-2026-90097](https://nvd.nist.gov/vuln/detail/CVE-2026-90097)

### References from the CNA

- <https://git.kernel.org/stable/c/321f650493d6b8169dacd4d5d6f63550dce54d6c>
- <https://git.kernel.org/stable/c/4cc1ba2b31065a48fde14e9d53ad399a3ca32e35>
- <https://git.kernel.org/stable/c/ca1f4a926d08035c52c735a42200e4e5ea548f32>
- <https://git.kernel.org/stable/c/aa17842bbccaeaba7d05c166019d1c96a41bca54>
- <https://git.kernel.org/stable/c/4c19c302cc577bd6b466f6d8e97971777392c2fa>
- <https://git.kernel.org/stable/c/cee0d90bceae1dee3bcc70f8d6b2ceb5b87deb42>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-90097>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90097/>. Everything for agents: <https://agentprime.io/llms.txt>.