# powerpc/mm: fix wrong addr_pfn tracking in compound vmemmap population

CVE record · `CVE-2026-89961`

- **Identifiers:** `CVE-2026-89961`
- **State:** Confirmed
- **Severity:** CVSS 7.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 19 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.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `f2b79c0d79683d552369bb9a7282c1f0226fc566 to before b96be860673f9fbbf12cdadb0b25fc4d6d4d207f` (git)
  - affected: `f2b79c0d79683d552369bb9a7282c1f0226fc566 to before e163c7184acf36ac20a248498f4a16016057ca01` (git)
  - affected: `f2b79c0d79683d552369bb9a7282c1f0226fc566 to before 9c914b7a0bd18834505c65f22225ce22c152b2d9` (git)
  - affected: `f2b79c0d79683d552369bb9a7282c1f0226fc566 to before 7968852a7ca3ce81477ec5b4494a28d612f35a97` (git)
  - affected: `f2b79c0d79683d552369bb9a7282c1f0226fc566 to before 89a4ae32764172468dea303eb6ae90fe6c859712` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.6`
  - unaffected: `before 6.6` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0018, the 7th 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 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89961](https://www.cve.org/CVERecord?id=CVE-2026-89961)
- [NVD: CVE-2026-89961](https://nvd.nist.gov/vuln/detail/CVE-2026-89961)

### References from the CNA

- <https://git.kernel.org/stable/c/b96be860673f9fbbf12cdadb0b25fc4d6d4d207f>
- <https://git.kernel.org/stable/c/e163c7184acf36ac20a248498f4a16016057ca01>
- <https://git.kernel.org/stable/c/9c914b7a0bd18834505c65f22225ce22c152b2d9>
- <https://git.kernel.org/stable/c/7968852a7ca3ce81477ec5b4494a28d612f35a97>
- <https://git.kernel.org/stable/c/89a4ae32764172468dea303eb6ae90fe6c859712>

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-2026-89961>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89961/>. Everything for agents: <https://agentprime.io/llms.txt>.