CVE-2026-90279

Full vulnerability record from the local CVENow database.

Description

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).

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-17 17:17:24.567000

Last modified

2026-10-19 09:19:21.430000

View original CVE JSON

{
  "id": "CVE-2026-90279",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:17:24.567",
  "lastModified": "2026-10-19T09:19:21.430",
  "vulnStatus": "Received",
  "cveTags": [],
  "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)."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/md/raid5.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "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",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/md/raid5.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.14",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.14",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.110",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.52",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "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"
    }
  ]
}