CVE-2026-100073 (GCVE-0-2026-100073)
Vulnerability from cvelistv5
Published
2026-09-25 13:06
Modified
2026-10-19 08:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix transaction overflow during writeback Commit 95ad8ee45cdb ("ext4: correct the reserved credits for extent conversion") was correct to note that we need to reserve enough credits for all extents possibly underlying a large folio. However it was too eager to reduce the number of reserved credits. Extent conversion may not only need to touch several leaf extent blocks, it may also need to split extents - for example a single large unwritten extent may need to be split into many small written ones in case of sparse folio dirtying. This can thus result not only in extent leaf modifications but also in a need to allocate new extent tree nodes. As a result the reserved transaction credits were not sufficient in some corner cases. Use ext4_meta_trans_blocks() for correct upper bound credit estimate.
References
Impacted products
Vendor Product Version
Linux Linux Version: 95ad8ee45cdbc321c135a2db895d48b374ef0f87
Version: 95ad8ee45cdbc321c135a2db895d48b374ef0f87
Version: 2b6d39229bc783198222cddd31e2fbded93c8db7
Version: 6.16.3   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ext4/inode.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix transaction overflow during writeback\n\nCommit 95ad8ee45cdb (\"ext4: correct the reserved credits for extent\nconversion\") was correct to note that we need to reserve enough credits\nfor all extents possibly underlying a large folio. However it was too\neager to reduce the number of reserved credits. Extent conversion may\nnot only need to touch several leaf extent blocks, it may also need to\nsplit extents - for example a single large unwritten extent may need to\nbe split into many small written ones in case of sparse folio dirtying.\nThis can thus result not only in extent leaf modifications but also in a\nneed to allocate new extent tree nodes. As a result the reserved\ntransaction credits were not sufficient in some corner cases. Use\next4_meta_trans_blocks() for correct upper bound credit estimate."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:43:05.446Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a22464c5df5827e884a5a7d3d8fb03870e5bb6c8"
        },
        {
          "url": "https://git.kernel.org/stable/c/46e8e31771f4f1c5e1cdec37a889a6730e42e9f1"
        }
      ],
      "title": "ext4: fix transaction overflow during writeback",
      "x_generator": {
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-100073",
    "datePublished": "2026-09-25T13:06:46.185Z",
    "dateReserved": "2026-09-25T10:25:14.456Z",
    "dateUpdated": "2026-10-19T08:43:05.446Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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