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": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/mm/mmu.c"
          ],
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          "vendor": "Linux",
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          "vendor": "Linux",
          "versions": [
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              "version": "6.16"
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
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                  "versionEndExcluding": "7.0.13",
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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": [
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          "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-53342",
      "date": "2026-07-02",
      "epss": "0.00154",
      "percentile": "0.04975"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-53342\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-01T14:16:42.260\",\"lastModified\":\"2026-07-01T14:16:42.260\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"arch/arm64/mm/mmu.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5e8eb9aeeda3a7aaf48efa1d34ae804e894e307f\",\"lessThan\":\"95f27fcda681021ed3906d3cae7e68b6a57a1d8e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5e8eb9aeeda3a7aaf48efa1d34ae804e894e307f\",\"lessThan\":\"aaa688ac9f18207f7452c6472e647c1febaea6a3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5e8eb9aeeda3a7aaf48efa1d34ae804e894e307f\",\"lessThan\":\"c594b83457ccdee76d458416fb3bc9348a37592f\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"arch/arm64/mm/mmu.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/95f27fcda681021ed3906d3cae7e68b6a57a1d8e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aaa688ac9f18207f7452c6472e647c1febaea6a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c594b83457ccdee76d458416fb3bc9348a37592f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • 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.


Detection rules are retrieved from Rulezet.