CVE-2026-74600 (GCVE-0-2026-74600)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:31 – Updated: 2026-10-30 12:30
VLAI
Title
mm/page_table_check: skip special zero mappings
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/page_table_check: skip special zero mappings page_table_check_set() and page_table_check_clear() account mappings based on PageAnon(). Shared zero-page PTEs and huge zero PMDs are special mappings, but page_table_check can still account them as file-backed pages. An unprivileged process can populate enough zero mappings to overflow file_map_count and hit the existing BUG_ON(). The PTE path can do this with the shared zero page, and the PMD path can do the same with huge zero mappings. Skip special zero mappings in the user page-table accounting paths. Keep the PTE-side pte_special() check, and identify huge zero PMDs from the mapped folio instead of pmd_special(). That covers architectures where pmd_special() is a no-op without adding huge_zero_pfn checks to the generic counter helpers.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: df4e817b710809425d899340dbfa8504a3ca4ba5 , < 084b031a1cc13b1d50b9660baace0b7eba52bebe (git)
Affected: df4e817b710809425d899340dbfa8504a3ca4ba5 , < f6cf9832e677ec07b1675782bd2bad472cfd3cdc (git)
Affected: df4e817b710809425d899340dbfa8504a3ca4ba5 , < 51e16e5adadaa78b56f31a1cb02eb7267787625e (git)
Affected: df4e817b710809425d899340dbfa8504a3ca4ba5 , < 7755be923e325dc300f4b0c3e1ad7e91b28b3cb9 (git)
Affected: df4e817b710809425d899340dbfa8504a3ca4ba5 , < b726eb3c94d23e09da0e0f46b0fa09fb2b5d99cc (git)
Affected: df4e817b710809425d899340dbfa8504a3ca4ba5 , < 8db4bab826ccc9ec10fa41736a48031cd338d392 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.18.46 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "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."
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        "dateUpdated": "2026-10-30T12:30:13.139Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "datePublished": "2026-08-22T15:31:49.334Z",
    "dateReserved": "2026-08-15T05:44:03.919Z",
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    "state": "PUBLISHED"
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      "version": "2"
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            "value": "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."
          },
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            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/page_table_check: omitir mapeos especiales de cero\n\npage_table_check_set() y page_table_check_clear() contabilizan los mapeos bas\u00e1ndose en PageAnon(). Los PTEs de p\u00e1gina cero compartida y los PMDs de cero enormes son mapeos especiales, pero page_table_check a\u00fan puede contabilizarlos como p\u00e1ginas respaldadas por archivos.\n\nUn proceso sin privilegios puede poblar suficientes mapeos de cero para desbordar file_map_count y activar el BUG_ON() existente. La ruta PTE puede hacer esto con la p\u00e1gina cero compartida, y la ruta PMD puede hacer lo mismo con mapeos de cero enormes.\n\nOmitir los mapeos especiales de cero en las rutas de contabilidad de la tabla de p\u00e1ginas de usuario. Mantener la verificaci\u00f3n pte_special() del lado PTE, e identificar los PMDs de cero enormes desde el folio mapeado en lugar de pmd_special(). Eso cubre arquitecturas donde pmd_special() es una no-op sin a\u00f1adir verificaciones de huge_zero_pfn a los ayudantes de contador gen\u00e9ricos."
          }
        ],
        "id": "CVE-2026-74600",
        "lastModified": "2026-10-30T13:20:03.103",
        "metrics": {},
        "published": "2026-08-22T16:16:32.430",
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      "cve": "CVE-2026-74600",
      "id": "CVE-2026-74600",
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      "product_status:known_affected": "77",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mm/page_table_check: skip special zero mappings",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74600.json",
      "version": "3"
    }
  }
}



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