CVE-2026-93239 (GCVE-0-2026-93239)
Vulnerability from cvelistv5
Published
2026-09-24 15:34
Modified
2026-10-30 12:36
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: mm: Fix the lockless page-table walk in show_pte() show_pte() walks page tables locklessly and can run with interrupts enabled. A concurrent teardown can free a table page while it is being walked. It can also clear a parent entry after show_pte() checked it; the regular pXd_offset() helpers then reread the cleared entry and can derive a bogus lower-level pointer and fault again. Use the lockless offset helpers with the saved parent entries, as gup_fast() does, and pass the saved PMD to pte_offset_map(). For task page tables, arm64 selects MMU_GATHER_RCU_TABLE_FREE. Disable local interrupts around the walk to hold off RCU-deferred table frees and block the tlb_remove_table_sync_one() IPI until the walk is finished. Place the IRQ guard after the header print. This does not make the output a consistent snapshot, but prevents the task page-table walk from dereferencing a released table page or deriving a pointer from a different parent value.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1d18c47c735e8adfe531fc41fae31e98f86b68fe
Version: 1d18c47c735e8adfe531fc41fae31e98f86b68fe
Version: 1d18c47c735e8adfe531fc41fae31e98f86b68fe
Version: 1d18c47c735e8adfe531fc41fae31e98f86b68fe
Version: 1d18c47c735e8adfe531fc41fae31e98f86b68fe
Version: 1d18c47c735e8adfe531fc41fae31e98f86b68fe
Version: 1d18c47c735e8adfe531fc41fae31e98f86b68fe
Version: 1d18c47c735e8adfe531fc41fae31e98f86b68fe
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{
  "containers": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/mm/fault.c"
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          "versions": [
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              "version": "0",
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              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "negate": false,
              "operator": "OR"
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          ]
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: mm: Fix the lockless page-table walk in show_pte()\n\nshow_pte() walks page tables locklessly and can run with interrupts\nenabled. A concurrent teardown can free a table page while it is being\nwalked. It can also clear a parent entry after show_pte() checked it; the\nregular pXd_offset() helpers then reread the cleared entry and can derive a\nbogus lower-level pointer and fault again.\n\nUse the lockless offset helpers with the saved parent entries, as\ngup_fast() does, and pass the saved PMD to pte_offset_map().\n\nFor task page tables, arm64 selects MMU_GATHER_RCU_TABLE_FREE. Disable\nlocal interrupts around the walk to hold off RCU-deferred table frees and\nblock the tlb_remove_table_sync_one() IPI until the walk is finished.\n\nPlace the IRQ guard after the header print. This does not make the output a\nconsistent snapshot, but prevents the task page-table walk from\ndereferencing a released table page or deriving a pointer from a different\nparent value."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:36:29.121Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b8f06b73ad146d84a33c124563c93eeef4f5b674"
        },
        {
          "url": "https://git.kernel.org/stable/c/b3535b6cb2c48f97b8c3378eb9ea12538425bf14"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1b06278a7e241da0cd3187871e67255f956d184"
        },
        {
          "url": "https://git.kernel.org/stable/c/08d931a0a850ad16a64f2cd23a19f40795cdbdf7"
        },
        {
          "url": "https://git.kernel.org/stable/c/b28fe65a36b8209b6adcf2722c7ce974cf9ac8d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/68cbd70795dd8c06e7ccdc4eb0b74c5b180076c3"
        },
        {
          "url": "https://git.kernel.org/stable/c/0f05d95b99164a9ccc4cf4a4920e0ff0228138ad"
        },
        {
          "url": "https://git.kernel.org/stable/c/a77644d009dece1104b6fcc6e322b0e4503db0d6"
        }
      ],
      "title": "arm64: mm: Fix the lockless page-table walk in show_pte()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93239",
    "datePublished": "2026-09-24T15:34:27.219Z",
    "dateReserved": "2026-09-17T16:02:15.095Z",
    "dateUpdated": "2026-10-30T12:36:29.121Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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