CVE-2026-80807 (GCVE-0-2026-80807)
Vulnerability from cvelistv5
Published
2026-09-04 15:13
Modified
2026-10-19 08:44
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nilfs2: reject invalid block index in GC ioctl Syzbot reported list corruption caused by a double list_add_tail() call on bh->b_assoc_buffers within nilfs_lookup_dirty_data_buffers(). Analysis revealed that the root cause was the insertion of a page/folio with a page index of ULONG_MAX into the page cache via the GC ioctl. filemap_get_folios_tag(), called by nilfs_lookup_dirty_data_buffers(), repeatedly detects a dirty folio with a page index of ULONG_MAX due to index wrap-around, leading to duplicate processing of dirty buffers. As a preparatory step, the GC ioctl loads the page/folio of the block to be moved during GC and inserts it into the page cache based on information in the nilfs_vdesc structure passed as an argument. Normally, this does not cause issues because the user-space GC library configures the nilfs_vdesc structure properly. However, since there is no range check on the parameters determining the page index, a request with artificially crafted parameters -- such as those generated by Syzbot -- can result in a page/folio being inserted with a page index of ULONG_MAX, triggering the above problem. This resolves the issue by checking the ranges of 'vd_offset' and 'vd_vblocknr' in the nilfs_vdesc structure that determine the page index, thereby preventing the invalid page/folio insertions.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7942b919f7321f95a777d396ff7894a7a83dc9b0
Version: 7942b919f7321f95a777d396ff7894a7a83dc9b0
Version: 7942b919f7321f95a777d396ff7894a7a83dc9b0
Version: 7942b919f7321f95a777d396ff7894a7a83dc9b0
Version: 7942b919f7321f95a777d396ff7894a7a83dc9b0
Version: 7942b919f7321f95a777d396ff7894a7a83dc9b0
Version: 7942b919f7321f95a777d396ff7894a7a83dc9b0
Version: 7942b919f7321f95a777d396ff7894a7a83dc9b0
Version: 7942b919f7321f95a777d396ff7894a7a83dc9b0
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{
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          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: reject invalid block index in GC ioctl\n\nSyzbot reported list corruption caused by a double list_add_tail() call on\nbh-\u003eb_assoc_buffers within nilfs_lookup_dirty_data_buffers().\n\nAnalysis revealed that the root cause was the insertion of a page/folio\nwith a page index of ULONG_MAX into the page cache via the GC ioctl.\nfilemap_get_folios_tag(), called by nilfs_lookup_dirty_data_buffers(),\nrepeatedly detects a dirty folio with a page index of ULONG_MAX due to\nindex wrap-around, leading to duplicate processing of dirty buffers.\n\nAs a preparatory step, the GC ioctl loads the page/folio of the block to\nbe moved during GC and inserts it into the page cache based on information\nin the nilfs_vdesc structure passed as an argument.  Normally, this does\nnot cause issues because the user-space GC library configures the\nnilfs_vdesc structure properly.  However, since there is no range check on\nthe parameters determining the page index, a request with artificially\ncrafted parameters -- such as those generated by Syzbot -- can result in a\npage/folio being inserted with a page index of ULONG_MAX, triggering the\nabove problem.\n\nThis resolves the issue by checking the ranges of \u0027vd_offset\u0027 and\n\u0027vd_vblocknr\u0027 in the nilfs_vdesc structure that determine the page index,\nthereby preventing the invalid page/folio insertions."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:44:00.360Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/898404cdf882d7b54f1132f75570984ca3214796"
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        {
          "url": "https://git.kernel.org/stable/c/ba8a8b563a28d358c45c62a306d421434a058648"
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        {
          "url": "https://git.kernel.org/stable/c/a5e776e2937581d67ec5b9b4d27b0f70d7baa6b1"
        },
        {
          "url": "https://git.kernel.org/stable/c/68aa9ab6f8f2895713aa6ddf781463ed8ea5ba44"
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          "url": "https://git.kernel.org/stable/c/e447f7edb99bd00cec63d6f3049e2e5074946f71"
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          "url": "https://git.kernel.org/stable/c/ec6ddf271dfa4c7e3147bc2c8b2bad4315f316a1"
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        {
          "url": "https://git.kernel.org/stable/c/fbcfb75c20d71a5b542ad4ac3b79d10b997c8152"
        },
        {
          "url": "https://git.kernel.org/stable/c/a1735eae55448bc79c2da6593455791e886f6ed8"
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      ],
      "title": "nilfs2: reject invalid block index in GC ioctl",
      "x_generator": {
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      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80807",
    "datePublished": "2026-09-04T15:13:23.605Z",
    "dateReserved": "2026-08-26T14:34:25.794Z",
    "dateUpdated": "2026-10-19T08:44:00.360Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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