CVE-2026-98223 (GCVE-0-2026-98223)
Vulnerability from cvelistv5
Published
2026-10-06 08:44
Modified
2026-10-19 09:15
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: mm: filemap: retain mapped dropbehind folios Fault-around can map ready dropbehind folios without going through the normal page-cache lookup that clears dropbehind. A mapping represents a competing cached user, so retain the folio instead of forcibly unmapping it when writeback completes. For a mapped folio, folio_unmap_invalidate() can call unmap_mapping_folio(), which takes i_mmap_rwsem and may sleep. Retaining mapped folios avoids this path when folio_end_dropbehind() runs in non-preemptible task context. Tal was able to trigger a sleeping-in-atomic warning due to this [1]. Unmapped dropbehind folios continue through the existing invalidation path.
References
Impacted products
Vendor Product Version
Linux Linux Version: fb7d3bc4149395c1ae99029c852eab6c28fc3c88
Version: fb7d3bc4149395c1ae99029c852eab6c28fc3c88
Version: fb7d3bc4149395c1ae99029c852eab6c28fc3c88
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "mm/filemap.c"
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          "vendor": "Linux",
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          "versions": [
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              "version": "6.14"
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      ],
      "cpeApplicability": [
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          "nodes": [
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                  "vulnerable": true
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: filemap: retain mapped dropbehind folios\n\nFault-around can map ready dropbehind folios without going through the\nnormal page-cache lookup that clears dropbehind.  A mapping represents a\ncompeting cached user, so retain the folio instead of forcibly unmapping\nit when writeback completes.\n\nFor a mapped folio, folio_unmap_invalidate() can call\nunmap_mapping_folio(), which takes i_mmap_rwsem and may sleep.  Retaining\nmapped folios avoids this path when folio_end_dropbehind() runs in\nnon-preemptible task context.\n\nTal was able to trigger a sleeping-in-atomic warning due to this [1].\n\nUnmapped dropbehind folios continue through the existing invalidation path."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:15:55.143Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2897601dffe576fcd87a4259102f41f7fb0cbfc8"
        },
        {
          "url": "https://git.kernel.org/stable/c/77c0fade37c80e8aa16ac048a9828249055e3f66"
        },
        {
          "url": "https://git.kernel.org/stable/c/848d2ce2fce15fbdc083fbf9691bfa72911033c4"
        }
      ],
      "title": "mm: filemap: retain mapped dropbehind folios",
      "x_generator": {
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98223",
    "datePublished": "2026-10-06T08:44:58.472Z",
    "dateReserved": "2026-09-25T10:25:14.327Z",
    "dateUpdated": "2026-10-19T09:15:55.143Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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