{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "df4e817b710809425d899340dbfa8504a3ca4ba5"
            },
            {
              "fixed": "7755be923e325dc300f4b0c3e1ad7e91b28b3cb9"
            },
            {
              "fixed": "b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc"
            },
            {
              "fixed": "8db4bab826ccc9ec10fa41736a48031cd338d392"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.17.0"
            },
            {
              "fixed": "6.18.46"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74600.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_table_check: skip special zero mappings\n\npage_table_check_set() and page_table_check_clear() account mappings based\non PageAnon().  Shared zero-page PTEs and huge zero PMDs are special\nmappings, but page_table_check can still account them as file-backed\npages.\n\nAn unprivileged process can populate enough zero mappings to overflow\nfile_map_count and hit the existing BUG_ON().  The PTE path can do this\nwith the shared zero page, and the PMD path can do the same with huge zero\nmappings.\n\nSkip special zero mappings in the user page-table accounting paths.  Keep\nthe PTE-side pte_special() check, and identify huge zero PMDs from the\nmapped folio instead of pmd_special().  That covers architectures where\npmd_special() is a no-op without adding huge_zero_pfn checks to the\ngeneric counter helpers.",
  "id": "CVE-2026-74600",
  "modified": "2026-08-25T03:51:37.541989812Z",
  "published": "2026-08-22T15:31:49.334Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7755be923e325dc300f4b0c3e1ad7e91b28b3cb9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8db4bab826ccc9ec10fa41736a48031cd338d392"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74600.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74600"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "mm/page_table_check: skip special zero mappings"
}