fs/proc/task_mmu: do not warn on seeing non-migration pmd entry

{
  "id": "5added26c9884ae7ba383ab7e5aa4a452dd1b97b5f55a8112087d5aa98c8017f",
  "url": "https://osv.dev/vulnerability/CVE-2026-72173",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "fs/proc/task_mmu: do not warn on seeing non-migration pmd entry",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: fs/proc/task_mmu: do not warn on seeing non-migration pmd entry Patch series \"mm/hmm: A fix and a selftest\", v3. Patch 1 fixes a stale warning present from the time when only migration softleaf entries were supported at the PMD level. Patch 2 adds some code into hmm-tests.c which exercises the pagemap path for PMD device-private entries. This patch (of 2): pagemap_pmd_range_thp() warns if a non-present PMD is not a migration entry. This became false once device-private entries at the PMD level were added. Therefore, remove the stale migration-only assertion.",
    "evidence": "osv:CVE-2026-72173",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-72173",
      "aliases": [
        "CVE-2026-72173"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a30b48bf1b244f11bf9b6d20cdccfe0c2264130c"
                },
                {
                  "fixed": "319caaca072adc564ac9c5357ed013909f23d5ab"
                },
                {
                  "fixed": "cd1fc0e3c1f67c0c31dfc215e5d9b771133dedc0"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72173.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72173.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.114628306Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/319caaca072adc564ac9c5357ed013909f23d5ab",
        "https://git.kernel.org/stable/c/cd1fc0e3c1f67c0c31dfc215e5d9b771133dedc0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72173.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-72173",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72173.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-72173",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 517599,
  "published_at": "2026-08-15T05:53:38.543+00:00"
}