{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "31a31da8a6187f1e5448ec73222e01d7d3fed4aa"
            },
            {
              "fixed": "9668ffe0e2a5e2399dce281620198a2e415871fc"
            },
            {
              "fixed": "c649324571206a30949765320b91ccdb4c1722dc"
            },
            {
              "fixed": "7441d6348c70738e9ed307510db171c7a9b3f4bf"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.15.0"
            },
            {
              "fixed": "6.18.44"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.8"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80685.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/util: don't read __page_2 for order-1 folios in snapshot_page()\n\nsnapshot_page() currently reads __page_2 after checking nr_pages \u003e 1, but\nit should only do so when nr_pages \u003e 2.\n\nIf an order-1 folio is allocated at the end of a vmemmap section,\n__page_2 will not exist and reading it will cause a fault.\n\nDuring DLPAR memory remove on a 22 TB ppc64le LPAR, snapshot_page() oopsed\non the page isolation path while reading an order-1 folio's __page_2 from\nan adjacent absent section (unmapped vmemmap).\n\nFix this to avoid reading memmap that doesn't exist (e.g., a vmemmap\nhole).",
  "id": "CVE-2026-80685",
  "modified": "2026-08-31T03:30:29.434900650Z",
  "published": "2026-08-28T06:52:51.305Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7441d6348c70738e9ed307510db171c7a9b3f4bf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9668ffe0e2a5e2399dce281620198a2e415871fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c649324571206a30949765320b91ccdb4c1722dc"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80685.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80685"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "mm/util: don't read __page_2 for order-1 folios in snapshot_page()"
}