CVE-2026-90279 (GCVE-0-2026-90279)
Vulnerability from cvelistv5
Published
2026-09-17 16:08
Modified
2026-10-19 09:00
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: md/raid5: round bitmap stripes with sector division raid5_bitmap_sector_map() aligns the array range to full RAID5 stripe widths before converting it to component sectors. That width is chunk_sectors multiplied by the number of data disks, and it is not always a power of two. Reproduce with a 4-disk RAID5, 1024-sector chunks, and three data disks. The full-stripe width is 3072 sectors. For a one-sector write at array sector 3072, correct rounding gives array range [3072, 6144), which maps to component range [1024, 2048). The old round_down()/round_up() logic instead gives [1024, 4096), which maps to [0, 1024). Use sector_div() based arithmetic so the rounded range is aligned to the actual RAID5 stripe width. The deterministic mapper test now reports the fixed component range as [1024, 2048), while the old mask-based range was [0, 1024).
References
Impacted products
Vendor Product Version
Linux Linux Version: b29e6400be51c214a0ad30dce937348b57abe33a
Version: aa8e15d69f5c0044d5bff61844e163aacc4ac172
Version: 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb
Version: 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb
Version: 9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb
Version: a41a0df5d7638acf15e723ad985980b4f7ff9383
Version: 6.6.79   ≤
Version: 6.12.13   ≤
Version: 6.13.2   ≤
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{
  "containers": {
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid5: round bitmap stripes with sector division\n\nraid5_bitmap_sector_map() aligns the array range to full RAID5 stripe\nwidths before converting it to component sectors. That width is\nchunk_sectors multiplied by the number of data disks, and it is not\nalways a power of two.\n\nReproduce with a 4-disk RAID5, 1024-sector chunks, and three data disks.\nThe full-stripe width is 3072 sectors. For a one-sector write at array\nsector 3072, correct rounding gives array range [3072, 6144), which maps\nto component range [1024, 2048). The old round_down()/round_up() logic\ninstead gives [1024, 4096), which maps to [0, 1024).\n\nUse sector_div() based arithmetic so the rounded range is aligned to the\nactual RAID5 stripe width.\n\nThe deterministic mapper test now reports the fixed component range as\n[1024, 2048), while the old mask-based range was [0, 1024)."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:00:57.773Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9d7490007707f90691911385365bd1d691d99225"
        },
        {
          "url": "https://git.kernel.org/stable/c/cab7d949b18b2f1cd625689dc16c5f81236bac93"
        },
        {
          "url": "https://git.kernel.org/stable/c/02c10581866d08822c6348e299881485fc546185"
        },
        {
          "url": "https://git.kernel.org/stable/c/ccbdc483eb041eef809e9ff223d1ad63518a2c52"
        },
        {
          "url": "https://git.kernel.org/stable/c/17ea021ae74987d6064c8195c4922fa025753892"
        }
      ],
      "title": "md/raid5: round bitmap stripes with sector division",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90279",
    "datePublished": "2026-09-17T16:08:10.654Z",
    "dateReserved": "2026-09-11T19:38:34.797Z",
    "dateUpdated": "2026-10-19T09:00:57.773Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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