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GHSA-54J7-PX5Q-9WRR

Vulnerability from github – Published: 2025-05-01 15:31 – Updated: 2025-11-07 21:31

Details

In the Linux kernel, the following vulnerability has been resolved:

arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud

The page table check trigger BUG_ON() unexpectedly when collapse hugepage:

------------[ cut here ]------------ kernel BUG at mm/page_table_check.c:82! Internal error: Oops - BUG: 00000000f2000800 [#1] SMP Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 6 PID: 68 Comm: khugepaged Not tainted 6.1.0-rc3+ #750 Hardware name: 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 [...] Call trace: 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 [...]

Since pmd_user_accessible_page() doesn't check if a pmd is leaf, it decrease file_map_count for a non-leaf pmd comes from collapse_huge_page(). and so trigger BUG_ON() unexpectedly.

Fix this problem by using pmd_leaf() insteal of pmd_present() in pmd_user_accessible_page(). Moreover, use pud_leaf() for pud_user_accessible_page() too.

Severity

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49778"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-617"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-05-01T15:16:00Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-54j7-px5q-9wrr",
  "modified": "2025-11-07T21:31:16Z",
  "published": "2025-05-01T15:31:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49778"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2d458046df634088611d44fd77f45465e833ef78"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b47348fc0b18a78c96f8474cc90b7525ad1bbfe"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49778 (GCVE-0-2022-49778)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2026-05-11 19:06

Title

arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud

Summary

In the Linux kernel, the following vulnerability has been resolved: arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud The page table check trigger BUG_ON() unexpectedly when collapse hugepage: ------------[ cut here ]------------ kernel BUG at mm/page_table_check.c:82! Internal error: Oops - BUG: 00000000f2000800 [#1] SMP Dumping ftrace buffer: (ftrace buffer empty) Modules linked in: CPU: 6 PID: 68 Comm: khugepaged Not tainted 6.1.0-rc3+ #750 Hardware name: 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 [...] Call trace: 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 [...] Since pmd_user_accessible_page() doesn't check if a pmd is leaf, it decrease file_map_count for a non-leaf pmd comes from collapse_huge_page(). and so trigger BUG_ON() unexpectedly. Fix this problem by using pmd_leaf() insteal of pmd_present() in pmd_user_accessible_page(). Moreover, use pud_leaf() for pud_user_accessible_page() too.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

2 references

URL	Tags
https://git.kernel.org/stable/c/2d458046df6340886…
https://git.kernel.org/stable/c/5b47348fc0b18a78c…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 42b2547137f5c974bb1bfd657c869fe96b96d86f , < 2d458046df634088611d44fd77f45465e833ef78 (git) Affected: 42b2547137f5c974bb1bfd657c869fe96b96d86f , < 5b47348fc0b18a78c96f8474cc90b7525ad1bbfe (git)
Linux	Linux	Affected: 5.19 Unaffected: 0 , < 5.19 (semver) Unaffected: 6.0.10 , ≤ 6.0.* (semver) Unaffected: 6.1 , ≤ * (original_commit_for_fix)

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{
  "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.10",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1",
                  "versionStartIncluding": "5.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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": "2026-05-11T19:06:36.025Z",
        "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-1.2.0"
      }
    }
  },
  "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": "2026-05-11T19:06:36.025Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

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Nomenclature

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Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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GHSA-54J7-PX5Q-9WRR

CVE-2022-49778 (GCVE-0-2022-49778)

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