CVE-2026-53342 (GCVE-0-2026-53342)

Vulnerability from cvelistv5 – Published: 2026-07-01 13:32 – Updated: 2026-07-01 13:32
VLAI?
Title
arm64: mm: call pagetable dtor when freeing hot-removed page tables
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: mm: call pagetable dtor when freeing hot-removed page tables Since 5e8eb9aeeda3 ("arm64: mm: always call PTE/PMD ctor in __create_pgd_mapping()") page-table allocation on ARM64 always calls pagetable_{pte,pmd,pud,p4d}_ctor(). This sets the page_type to PGTY_table, increments NR_PAGETABLE and possible allocates a PTL. However the matching pagetable_dtor() calls were never added. With DEBUG_VM enabled on kernel versions prior to v6.17 without 2dfcd1608f3a9 ("mm/page_alloc: let page freeing clear any set page type") this leads to the following warning when freeing these pages due to page->page_type sharing page->_mapcount: BUG: Bad page state in process ... pfn:284fbb page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x284fbb flags: 0x17fffc000000000(node=0|zone=2|lastcpupid=0x1ffff) page_type: f2(table) page dumped because: nonzero mapcount Call trace: bad_page+0x13c/0x160 __free_frozen_pages+0x6cc/0x860 ___free_pages+0xf4/0x180 free_pages+0x54/0x80 free_hotplug_page_range.part.0+0x58/0x90 free_empty_tables+0x438/0x500 __remove_pgd_mapping.constprop.0+0x60/0xa8 arch_remove_memory+0x48/0x80 try_remove_memory+0x158/0x1d8 offline_and_remove_memory+0x138/0x180 It can also lead to leaking the ptl allocation if ALLOC_SPLIT_PTLOCKS is defined and incorrect NR_PAGETABLE stats. Fix this by calling pagetable_dtor() in free_hotplug_pgtable_page() prior to freeing the page to undo the effects of calling pagetable_*_ctor().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5e8eb9aeeda3a7aaf48efa1d34ae804e894e307f , < 95f27fcda681021ed3906d3cae7e68b6a57a1d8e (git)
Affected: 5e8eb9aeeda3a7aaf48efa1d34ae804e894e307f , < aaa688ac9f18207f7452c6472e647c1febaea6a3 (git)
Affected: 5e8eb9aeeda3a7aaf48efa1d34ae804e894e307f , < c594b83457ccdee76d458416fb3bc9348a37592f (git)
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    Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/mm/mmu.c"
          ],
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          "vendor": "Linux",
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              "versionType": "git"
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          "programFiles": [
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          "vendor": "Linux",
          "versions": [
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              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.36",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.13",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
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                  "versionEndExcluding": "7.1",
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                }
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: mm: call pagetable dtor when freeing hot-removed page tables\n\nSince 5e8eb9aeeda3 (\"arm64: mm: always call PTE/PMD ctor in\n__create_pgd_mapping()\") page-table allocation on ARM64 always calls\npagetable_{pte,pmd,pud,p4d}_ctor().  This sets the page_type to\nPGTY_table, increments NR_PAGETABLE and possible allocates a PTL.  However\nthe matching pagetable_dtor() calls were never added.\n\nWith DEBUG_VM enabled on kernel versions prior to v6.17 without\n2dfcd1608f3a9 (\"mm/page_alloc: let page freeing clear any set page type\")\nthis leads to the following warning when freeing these pages due to\npage-\u003epage_type sharing page-\u003e_mapcount:\n\n  BUG: Bad page state in process ... pfn:284fbb\n  page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x284fbb\n  flags: 0x17fffc000000000(node=0|zone=2|lastcpupid=0x1ffff)\n  page_type: f2(table)\n  page dumped because: nonzero mapcount\n  Call trace:\n   bad_page+0x13c/0x160\n   __free_frozen_pages+0x6cc/0x860\n   ___free_pages+0xf4/0x180\n   free_pages+0x54/0x80\n   free_hotplug_page_range.part.0+0x58/0x90\n   free_empty_tables+0x438/0x500\n   __remove_pgd_mapping.constprop.0+0x60/0xa8\n   arch_remove_memory+0x48/0x80\n   try_remove_memory+0x158/0x1d8\n   offline_and_remove_memory+0x138/0x180\n\nIt can also lead to leaking the ptl allocation if ALLOC_SPLIT_PTLOCKS is\ndefined and incorrect NR_PAGETABLE stats.  Fix this by calling\npagetable_dtor() in free_hotplug_pgtable_page() prior to freeing the page\nto undo the effects of calling pagetable_*_ctor()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-01T13:32:23.449Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/95f27fcda681021ed3906d3cae7e68b6a57a1d8e"
        },
        {
          "url": "https://git.kernel.org/stable/c/aaa688ac9f18207f7452c6472e647c1febaea6a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/c594b83457ccdee76d458416fb3bc9348a37592f"
        }
      ],
      "title": "arm64: mm: call pagetable dtor when freeing hot-removed page tables",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53342",
    "datePublished": "2026-07-01T13:32:23.449Z",
    "dateReserved": "2026-06-09T07:44:35.399Z",
    "dateUpdated": "2026-07-01T13:32:23.449Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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