# CVE-2026-45880: PCI/P2PDMA: Release per-CPU pgmap ref when vm_insert_page() fails

Status: published. Published: 2026-05-27. Updated: 2026-11-06.

In the Linux kernel, the following vulnerability has been resolved:

PCI/P2PDMA: Release per-CPU pgmap ref when vm_insert_page() fails

When vm_insert_page() fails in p2pmem_alloc_mmap(), p2pmem_alloc_mmap()
doesn't invoke percpu_ref_put() to free the per-CPU ref of pgmap acquired
after gen_pool_alloc_owner(), and memunmap_pages() will hang forever when
trying to remove the PCI device.

Fix it by adding the missed percpu_ref_put().

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/51b7181cfbedf289ce794b6d97a1c596c309ec38
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/6220694c52a5a04102b48109e4f24e958b559bd3
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/a1f4dc72efc3204db95d052058d785cad7ce755f
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/baa42b756d183a59572f3890981a3d32b8d05d40
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67) — https://git.kernel.org/stable/c/e19cce88ec4c4877f4ff2469099b9cf23cc3e93e

## Affected products and versions

- Linux / Linux: ≥ 7e9c7ef83d785236f5a8c3761dd053fae9b92fb8; < baa42b756d183a59572f3890981a3d32b8d05d40 (affected, git); ≥ 7e9c7ef83d785236f5a8c3761dd053fae9b92fb8; < 51b7181cfbedf289ce794b6d97a1c596c309ec38 (affected, git); ≥ 7e9c7ef83d785236f5a8c3761dd053fae9b92fb8; < e19cce88ec4c4877f4ff2469099b9cf23cc3e93e (affected, git); ≥ 7e9c7ef83d785236f5a8c3761dd053fae9b92fb8; < a1f4dc72efc3204db95d052058d785cad7ce755f (affected, git); ≥ 7e9c7ef83d785236f5a8c3761dd053fae9b92fb8; < 6220694c52a5a04102b48109e4f24e958b559bd3 (affected, git). Source: CNA: Linux
- Linux / Linux: 6.2 (affected); ≥ 0; < 6.2 (unaffected, semver); ≥ 6.6.128; ≤ 6.6.* (unaffected, semver); ≥ 6.12.75; ≤ 6.12.* (unaffected, semver); ≥ 6.18.14; ≤ 6.18.* (unaffected, semver); ≥ 6.19.4; ≤ 6.19.* (unaffected, semver); ≥ 7.0; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux

## NVD configuration conditions

Affected CPE matches depend on the following AND/OR and negation conditions:

```json
[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.6.128",
            "versionStartIncluding": "6.2",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.12.75",
            "versionStartIncluding": "6.7",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.18.14",
            "versionStartIncluding": "6.13",
            "vulnerable": true
          },
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.19.4",
            "versionStartIncluding": "6.19",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]
```

## Severity and prioritization

- CVSS 3.1: 5.5 (medium); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H; source: NVD: nvd@nist.gov

- CISA KEV: No listing in collected sources

- EPSS: 0.16% as of 2026-11-06; percentile 5.19%

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/baa42b756d183a59572f3890981a3d32b8d05d40 (CNA: Linux)

- https://git.kernel.org/stable/c/51b7181cfbedf289ce794b6d97a1c596c309ec38 (CNA: Linux)

- https://git.kernel.org/stable/c/e19cce88ec4c4877f4ff2469099b9cf23cc3e93e (CNA: Linux)

- https://git.kernel.org/stable/c/a1f4dc72efc3204db95d052058d785cad7ce755f (CNA: Linux)

- https://git.kernel.org/stable/c/6220694c52a5a04102b48109e4f24e958b559bd3 (CNA: Linux)

- https://git.kernel.org/stable/c/51b7181cfbedf289ce794b6d97a1c596c309ec38 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/6220694c52a5a04102b48109e4f24e958b559bd3 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/a1f4dc72efc3204db95d052058d785cad7ce755f (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/baa42b756d183a59572f3890981a3d32b8d05d40 (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

- https://git.kernel.org/stable/c/e19cce88ec4c4877f4ff2469099b9cf23cc3e93e (416baaa9-dc9f-4396-8d5f-8c081fb06d67; Patch)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-45880; retrieved 2026-11-06; source updated 2026-11-06

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-45880; retrieved 2026-11-06; source updated 2026-11-06

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-45880; retrieved 2026-11-06; source updated Not reported

Revision: aaf7db8ba22a9aea8a9b7e0bd908bc5c3889b7c82afcffe708bfd35aaf51e34e

Canonical: https://y2.dev/cve/CVE-2026-45880

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.