CVE-2026-89642 (GCVE-0-2026-89642)
Vulnerability from cvelistv5
Published
2026-09-11 19:45
Modified
2026-10-30 12:32
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: cifs: call pagecache_isize_extended() in cifs_setsize() when extending cifs_setsize() calls truncate_pagecache() but skips pagecache_isize_extended() on extension. truncate_setsize() shows the correct pattern: i_size_write(inode, newsize); if (newsize > oldsize) pagecache_isize_extended(inode, oldsize, newsize); truncate_pagecache(inode, newsize); pagecache_isize_extended() zeroes the tail of the page straddling old EOF. Without it, dirty bytes in that region can be written back to the server, exposing stale data in the newly extended range.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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{
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          "programFiles": [
            "fs/smb/client/inode.c"
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "vulnerable": true
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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\ncifs: call pagecache_isize_extended() in cifs_setsize() when extending\n\ncifs_setsize() calls truncate_pagecache() but skips\npagecache_isize_extended() on extension.  truncate_setsize() shows\nthe correct pattern:\n\n  i_size_write(inode, newsize);\n  if (newsize \u003e oldsize)\n      pagecache_isize_extended(inode, oldsize, newsize);\n  truncate_pagecache(inode, newsize);\n\npagecache_isize_extended() zeroes the tail of the page straddling old\nEOF.  Without it, dirty bytes in that region can be written back to\nthe server, exposing stale data in the newly extended range."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:32:25.947Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/880e1b5883a5d78d916fa446791c48f28a16719b"
        },
        {
          "url": "https://git.kernel.org/stable/c/5463d96cd2e46064ceefcf861b028745a4f4c373"
        },
        {
          "url": "https://git.kernel.org/stable/c/40c16040783abcc240bd1b453e679ea6ca30e19e"
        },
        {
          "url": "https://git.kernel.org/stable/c/e1f692b6da3e632a25d0b3a99f833bb609bae1a3"
        },
        {
          "url": "https://git.kernel.org/stable/c/12bafe32f09c0d24f5096154b59c347b9c6606e0"
        },
        {
          "url": "https://git.kernel.org/stable/c/c510edb9734af1c274d18f4f31a471a166bbc7e8"
        }
      ],
      "title": "cifs: call pagecache_isize_extended() in cifs_setsize() when extending",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89642",
    "datePublished": "2026-09-11T19:45:34.778Z",
    "dateReserved": "2026-09-11T19:38:34.741Z",
    "dateUpdated": "2026-10-30T12:32:25.947Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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