mm/page_table_check: fix crash on ZONE_DEVICE

{
  "id": "3970ed6c22584db543dcb03a9bd073746acf26a045f7068622d36a8bc1366d41",
  "url": "https://osv.dev/vulnerability/CVE-2024-40948",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "mm/page_table_check: fix crash on ZONE_DEVICE",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: mm/page_table_check: fix crash on ZONE_DEVICE Not all pages may apply to pgtable check. One example is ZONE_DEVICE pages: they map PFNs directly, and they don't allocate page_ext at all even if there's struct page around. One may reference devm_memremap_pages(). When both ZONE_DEVICE and page-table-check enabled, then try to map some dax memories, one can trigger kernel bug constantly now when the kernel was trying to inject some pfn maps on the dax device: kernel BUG at mm/page_table_check.c:55! While it's pretty legal to use set_pxx_at() for ZONE_DEVICE pages for page fault resolutions, skip all the checks if page_ext doesn't even exist in pgtable checker, which applies to ZONE_DEVICE but maybe more.",
    "evidence": "osv:CVE-2024-40948",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.96",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.36",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.9.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-40948",
      "aliases": [
        "CVE-2024-40948"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "df4e817b710809425d899340dbfa8504a3ca4ba5"
                },
                {
                  "fixed": "51897f99351fff7b57f4f141940fa93b4e90fd2b"
                },
                {
                  "fixed": "84d3549d54f5ff9fa3281257be3019386f51d1a0"
                },
                {
                  "fixed": "dec2382247860d2134c8d41e103e26460c099629"
                },
                {
                  "fixed": "8bb592c2eca8fd2bc06db7d80b38da18da4a2f43"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-40948.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.17.0"
                },
                {
                  "fixed": "6.1.96"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.36"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.9.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-40948.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.985814966Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/51897f99351fff7b57f4f141940fa93b4e90fd2b",
        "https://git.kernel.org/stable/c/84d3549d54f5ff9fa3281257be3019386f51d1a0",
        "https://git.kernel.org/stable/c/8bb592c2eca8fd2bc06db7d80b38da18da4a2f43",
        "https://git.kernel.org/stable/c/dec2382247860d2134c8d41e103e26460c099629",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/40xxx/CVE-2024-40948.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-40948",
        "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/2024/40xxx/CVE-2024-40948.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-40948",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 494585,
  "published_at": "2024-07-12T12:31:53.478+00:00"
}