# KVM: nVMX: Service local TLB flushes on failed nested VM-Enter

CVE record · `CVE-2026-89930`

- **Identifiers:** `CVE-2026-89930`
- **State:** Confirmed
- **Severity:** CVSS 9.3 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:32 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.

## Critical

Critical, because:

- CVSS score 9.3: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to before b577a7cd6d984dd430af88ee1c9e03da71b73ee0` (git)
  - affected: `5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to before c0c66cd575e31218da6a7d104c6ef80b0830b60c` (git)
  - affected: `5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to before 1025b938dc439b75c720a568a855a13eeb245686` (git)
  - affected: `5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to before 312cdb6d8940827dea63a7a52fb714a5049f06d1` (git)
  - affected: `5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to before f74fccdf4f7fb0780cd84944108d35f3d9dc46a7` (git)
  - affected: `5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to before c43563e7518e65ec6ccaa6a65f84c5af5ca5d379` (git)
  - affected: `5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to before 62c3ee4c9f0e2efef5157358b3549e50ede96d73` (git)
  - affected: `5c614b3583e7b6dab0c86356fa36c2bcbb8322a0 to before 05a0b701d1089fb57beeb8982f23c3bbafe0fa8b` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.4`
  - unaffected: `before 4.4` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.221 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.5 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## 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

- 9.3 Critical, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0019, the 8th percentile, on 15 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 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89930](https://www.cve.org/CVERecord?id=CVE-2026-89930)
- [NVD: CVE-2026-89930](https://nvd.nist.gov/vuln/detail/CVE-2026-89930)

### References from the CNA

- <https://git.kernel.org/stable/c/b577a7cd6d984dd430af88ee1c9e03da71b73ee0>
- <https://git.kernel.org/stable/c/c0c66cd575e31218da6a7d104c6ef80b0830b60c>
- <https://git.kernel.org/stable/c/1025b938dc439b75c720a568a855a13eeb245686>
- <https://git.kernel.org/stable/c/312cdb6d8940827dea63a7a52fb714a5049f06d1>
- <https://git.kernel.org/stable/c/f74fccdf4f7fb0780cd84944108d35f3d9dc46a7>
- <https://git.kernel.org/stable/c/c43563e7518e65ec6ccaa6a65f84c5af5ca5d379>
- <https://git.kernel.org/stable/c/62c3ee4c9f0e2efef5157358b3549e50ede96d73>
- <https://git.kernel.org/stable/c/05a0b701d1089fb57beeb8982f23c3bbafe0fa8b>

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-2026-89930>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89930/>. Everything for agents: <https://agentprime.io/llms.txt>.