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CVE-2026-90279

Estado: RecibidaSin puntuar—

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).

Leer descripción completaMostrar menos

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).

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-90279",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "b29e6400be51c214a0ad30dce937348b57abe33a",
              "lessThan": "9d7490007707f90691911385365bd1d691d99225",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "aa8e15d69f5c0044d5bff61844e163aacc4ac172",
              "lessThan": "cab7d949b18b2f1cd625689dc16c5f81236bac93",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb",
              "lessThan": "02c10581866d08822c6348e299881485fc546185",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb",
              "lessThan": "ccbdc483eb041eef809e9ff223d1ad63518a2c52",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb",
              "lessThan": "17ea021ae74987d6064c8195c4922fa025753892",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "a41a0df5d7638acf15e723ad985980b4f7ff9383",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6.6.79",
              "lessThan": "6.6.157",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.12.13",
              "lessThan": "6.12.110",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.13.2",
              "lessThan": "6.14",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/md/raid5.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.14"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.14",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/md/raid5.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-17T17:17:24.567",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/02c10581866d08822c6348e299881485fc546185",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/17ea021ae74987d6064c8195c4922fa025753892",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9d7490007707f90691911385365bd1d691d99225",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cab7d949b18b2f1cd625689dc16c5f81236bac93",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ccbdc483eb041eef809e9ff223d1ad63518a2c52",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "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)."
    }
  ],
  "lastModified": "2026-09-17T17:17:24.567",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}