# KVM: x86/mmu: Bail from shadow walks if the root is invalid or a dummy

CVE record · `CVE-2026-98717`

- **Identifiers:** `CVE-2026-98717`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 18 Oct 2026
- **Updated:** 21 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 18 Oct 2026, 15:46 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: `0e3223d8d00ac05849661f1b8b476d3caca251cf to before 951fce1510645ba5df38da6fb85ece5726ec347d` (git)
  - affected: `0e3223d8d00ac05849661f1b8b476d3caca251cf to before e1bcabc07efd029ab414894127411129ffdb8b48` (git)
  - affected: `0e3223d8d00ac05849661f1b8b476d3caca251cf to before 97c1dcce17ef27853860c781f9912257e6adbf7c` (git)
  - affected: `0e3223d8d00ac05849661f1b8b476d3caca251cf to before 681e31f03ec9219099a66a0f6e1bc48e1b5aa914` (git)
  - affected: `0e3223d8d00ac05849661f1b8b476d3caca251cf to before b6249c1d5665098c8bf12f8d3e4712bf04c775bc` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.6`
  - unaffected: `before 6.6` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.113 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.56 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.10 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0020, the 9th percentile, on 7 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 18 Oct 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-98717](https://www.cve.org/CVERecord?id=CVE-2026-98717)
- [NVD: CVE-2026-98717](https://nvd.nist.gov/vuln/detail/CVE-2026-98717)

### References from the CNA

- <https://git.kernel.org/stable/c/951fce1510645ba5df38da6fb85ece5726ec347d>
- <https://git.kernel.org/stable/c/e1bcabc07efd029ab414894127411129ffdb8b48>
- <https://git.kernel.org/stable/c/97c1dcce17ef27853860c781f9912257e6adbf7c>
- <https://git.kernel.org/stable/c/681e31f03ec9219099a66a0f6e1bc48e1b5aa914>
- <https://git.kernel.org/stable/c/b6249c1d5665098c8bf12f8d3e4712bf04c775bc>

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-2026-98717>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-98717/>. Everything for agents: <https://agentprime.io/llms.txt>.