# KVM: x86/mmu: Check write tracking in all address spaces

CVE record · `CVE-2026-98164`

- **Identifiers:** `CVE-2026-98164`
- **State:** Confirmed
- **Severity:** CVSS 7.1 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 29 Sept 2026
- **Updated:** 7 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 29 Sept 2026, 12:02 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: `699023e239658e62da6f42f47d31b54788521ec1 to before 09aa68552d2542cc6c23edd1568ac265dc5d886f` (git)
  - affected: `699023e239658e62da6f42f47d31b54788521ec1 to before 429b6f43b4d8c98988fdca99e02dc156134e3d77` (git)
  - affected: `699023e239658e62da6f42f47d31b54788521ec1 to before d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a` (git)
  - affected: `699023e239658e62da6f42f47d31b54788521ec1 to before c0a9bd5fca0b5f2dea32b0fc31350e71e8648112` (git)
  - affected: `699023e239658e62da6f42f47d31b54788521ec1 to before ec8fcaf354c1cbb36755d48e9f5a00c9591349e5` (git)
  - affected: `699023e239658e62da6f42f47d31b54788521ec1 to before 0f38453cdb2e17566ccb7c0f3dabd5bd21caca26` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.2`
  - unaffected: `before 4.2` (semver)
  - unaffected: `6.1.187 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.156 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.108 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.49 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.13 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0015, the 4th percentile, on 11 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 29 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-98164](https://www.cve.org/CVERecord?id=CVE-2026-98164)
- [NVD: CVE-2026-98164](https://nvd.nist.gov/vuln/detail/CVE-2026-98164)

### References from the CNA

- <https://git.kernel.org/stable/c/09aa68552d2542cc6c23edd1568ac265dc5d886f>
- <https://git.kernel.org/stable/c/429b6f43b4d8c98988fdca99e02dc156134e3d77>
- <https://git.kernel.org/stable/c/d8636c8f9f95d0fd1e2f6f1cad0d5757aa6f212a>
- <https://git.kernel.org/stable/c/c0a9bd5fca0b5f2dea32b0fc31350e71e8648112>
- <https://git.kernel.org/stable/c/ec8fcaf354c1cbb36755d48e9f5a00c9591349e5>
- <https://git.kernel.org/stable/c/0f38453cdb2e17566ccb7c0f3dabd5bd21caca26>

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-2026-98164>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-98164/>. Everything for agents: <https://agentprime.io/llms.txt>.