{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/include/asm/pgtable.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2d458046df634088611d44fd77f45465e833ef78",
              "status": "affected",
              "version": "42b2547137f5c974bb1bfd657c869fe96b96d86f",
              "versionType": "git"
            },
            {
              "lessThan": "5b47348fc0b18a78c96f8474cc90b7525ad1bbfe",
              "status": "affected",
              "version": "42b2547137f5c974bb1bfd657c869fe96b96d86f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/include/asm/pgtable.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19"
            },
            {
              "lessThan": "5.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64/mm: fix incorrect file_map_count for non-leaf pmd/pud\n\nThe page table check trigger BUG_ON() unexpectedly when collapse hugepage:\n\n ------------[ cut here ]------------\n kernel BUG at mm/page_table_check.c:82!\n Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\n Dumping ftrace buffer:\n    (ftrace buffer empty)\n Modules linked in:\n CPU: 6 PID: 68 Comm: khugepaged Not tainted 6.1.0-rc3+ #750\n Hardware name: linux,dummy-virt (DT)\n pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n pc : page_table_check_clear.isra.0+0x258/0x3f0\n lr : page_table_check_clear.isra.0+0x240/0x3f0\n[...]\n Call trace:\n  page_table_check_clear.isra.0+0x258/0x3f0\n  __page_table_check_pmd_clear+0xbc/0x108\n  pmdp_collapse_flush+0xb0/0x160\n  collapse_huge_page+0xa08/0x1080\n  hpage_collapse_scan_pmd+0xf30/0x1590\n  khugepaged_scan_mm_slot.constprop.0+0x52c/0xac8\n  khugepaged+0x338/0x518\n  kthread+0x278/0x2f8\n  ret_from_fork+0x10/0x20\n[...]\n\nSince pmd_user_accessible_page() doesn\u0027t check if a pmd is leaf, it\ndecrease file_map_count for a non-leaf pmd comes from collapse_huge_page().\nand so trigger BUG_ON() unexpectedly.\n\nFix this problem by using pmd_leaf() insteal of pmd_present() in\npmd_user_accessible_page(). Moreover, use pud_leaf() for\npud_user_accessible_page() too."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-01T14:09:13.828Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2d458046df634088611d44fd77f45465e833ef78"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b47348fc0b18a78c96f8474cc90b7525ad1bbfe"
        }
      ],
      "title": "arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud",
      "x_generator": {
        "engine": "bippy-1.1.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49778",
    "datePublished": "2025-05-01T14:09:13.828Z",
    "dateReserved": "2025-04-16T07:17:33.805Z",
    "dateUpdated": "2025-05-01T14:09:13.828Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49778\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T15:16:00.980\",\"lastModified\":\"2025-05-02T13:53:20.943\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\narm64/mm: fix incorrect file_map_count for non-leaf pmd/pud\\n\\nThe page table check trigger BUG_ON() unexpectedly when collapse hugepage:\\n\\n ------------[ cut here ]------------\\n kernel BUG at mm/page_table_check.c:82!\\n Internal error: Oops - BUG: 00000000f2000800 [#1] SMP\\n Dumping ftrace buffer:\\n    (ftrace buffer empty)\\n Modules linked in:\\n CPU: 6 PID: 68 Comm: khugepaged Not tainted 6.1.0-rc3+ #750\\n Hardware name: linux,dummy-virt (DT)\\n pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\\n pc : page_table_check_clear.isra.0+0x258/0x3f0\\n lr : page_table_check_clear.isra.0+0x240/0x3f0\\n[...]\\n Call trace:\\n  page_table_check_clear.isra.0+0x258/0x3f0\\n  __page_table_check_pmd_clear+0xbc/0x108\\n  pmdp_collapse_flush+0xb0/0x160\\n  collapse_huge_page+0xa08/0x1080\\n  hpage_collapse_scan_pmd+0xf30/0x1590\\n  khugepaged_scan_mm_slot.constprop.0+0x52c/0xac8\\n  khugepaged+0x338/0x518\\n  kthread+0x278/0x2f8\\n  ret_from_fork+0x10/0x20\\n[...]\\n\\nSince pmd_user_accessible_page() doesn\u0027t check if a pmd is leaf, it\\ndecrease file_map_count for a non-leaf pmd comes from collapse_huge_page().\\nand so trigger BUG_ON() unexpectedly.\\n\\nFix this problem by using pmd_leaf() insteal of pmd_present() in\\npmd_user_accessible_page(). Moreover, use pud_leaf() for\\npud_user_accessible_page() too.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64/mm: corrige el file_map_count incorrecto para pmd/pud que no es de hoja. La comprobaci\u00f3n de la tabla de p\u00e1ginas se activa inesperadamente BUG_ON() cuando se colapsa hugepage: ------------[ cortar aqu\u00ed ]------------ \u00a1ERROR del kernel en mm/page_table_check.c:82! Error interno: Ups - BUG: 00000000f2000800 [#1] SMP Volcando b\u00fafer ftrace: (b\u00fafer ftrace vac\u00edo) M\u00f3dulos enlazados: CPU: 6 PID: 68 Comm: khugepaged No contaminado 6.1.0-rc3+ #750 Nombre del hardware: linux,dummy-virt (DT) pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : page_table_check_clear.isra.0+0x258/0x3f0 lr : page_table_check_clear.isra.0+0x240/0x3f0 [...] Rastreo de llamadas: page_table_check_clear.isra.0+0x258/0x3f0 __page_table_check_pmd_clear+0xbc/0x108 pmdp_collapse_flush+0xb0/0x160 collapse_huge_page+0xa08/0x1080 hpage_collapse_scan_pmd+0xf30/0x1590 khugepaged_scan_mm_slot.constprop.0+0x52c/0xac8 khugepaged+0x338/0x518 kthread+0x278/0x2f8 ret_from_fork+0x10/0x20 [...] Dado que pmd_user_accessible_page() no comprueba si un pmd es hoja, disminuye file_map_count para un pmd que no es hoja que proviene de colapso_huge_page() y, por lo tanto, activa BUG_ON() inesperadamente. Solucione este problema usando pmd_leaf() en lugar de pmd_present() en pmd_user_accessible_page(). Adem\u00e1s, use pud_leaf() para pud_user_accessible_page().\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2d458046df634088611d44fd77f45465e833ef78\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5b47348fc0b18a78c96f8474cc90b7525ad1bbfe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}