{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "6fd3620b342861de9547ea01d28f664892ef51a1"
            },
            {
              "fixed": "511a60e71aec308b24722cffc1912bf6befb87bf"
            },
            {
              "fixed": "11f2826e9ee6f24aaa774e3dcd75abbe4b3091b6"
            },
            {
              "fixed": "da5234df0941665f3a3f5b80f3dab94046537be0"
            },
            {
              "fixed": "b91e27bce37cab9f35de0059278ebe457ca9878b"
            },
            {
              "fixed": "cd681403a87085562499d60325b7b45d3be11217"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.19.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72172.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mm_init: fix uninitialized struct pages for ZONE_DEVICE\n\nIf DAX memory is hotplugged into an unoccupied subsection of an early\nsection, section_activate() reuses the unoptimized boot memmap.  However,\ncompound_nr_pages() still assumes that vmemmap optimization is in effect\nand initializes only the reduced number of struct pages.  As a result, the\nremaining tail struct pages are left uninitialized, which can later lead\nto unexpected behavior or crashes.\n\nFix this by treating early sections as unoptimized when calculating how\nmany struct pages to initialize.",
  "id": "CVE-2026-72172",
  "modified": "2026-08-18T03:31:03.986272088Z",
  "published": "2026-08-15T05:53:37.795Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11f2826e9ee6f24aaa774e3dcd75abbe4b3091b6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/511a60e71aec308b24722cffc1912bf6befb87bf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b91e27bce37cab9f35de0059278ebe457ca9878b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cd681403a87085562499d60325b7b45d3be11217"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/da5234df0941665f3a3f5b80f3dab94046537be0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72172.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72172"
    },
    {
      "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:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "mm/mm_init: fix uninitialized struct pages for ZONE_DEVICE"
}