mm/migrate_device: fix pgtable leak in migrate_vma_insert_huge_pmd_page

{
  "id": "b67f27d35fe4f8d7d5b24f509866ab75148f827f6c98c691ba8e97566239d933",
  "url": "https://osv.dev/vulnerability/CVE-2026-63953",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm/migrate_device: fix pgtable leak in migrate_vma_insert_huge_pmd_page",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm/migrate_device: fix pgtable leak in migrate_vma_insert_huge_pmd_page When migrate_vma_insert_huge_pmd_page() jumps to unlock_abort due to a PMD check failure, the pgtable allocated earlier via pte_alloc_one() is never freed, causing a memory leak. Added free_abort label to release the pgtable in error path.",
    "evidence": "osv:CVE-2026-63953",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.0.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-63953",
      "aliases": [
        "CVE-2026-63953"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a30b48bf1b244f11bf9b6d20cdccfe0c2264130c"
                },
                {
                  "fixed": "24861d04f197bb651e9dfb211978271c15f75a98"
                },
                {
                  "fixed": "2c6f81d58741349298f51ff697d988cb42881453"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63953.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.12"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63953.json"
          }
        }
      ],
      "modified": "2026-11-01T02:30:37.996180284Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/24861d04f197bb651e9dfb211978271c15f75a98",
        "https://git.kernel.org/stable/c/2c6f81d58741349298f51ff697d988cb42881453",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63953.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63953",
        "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/2026/63xxx/CVE-2026-63953.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-63953",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 510999,
  "published_at": "2026-07-19T14:55:45.509+00:00"
}