{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "b29e6400be51c214a0ad30dce937348b57abe33a"
            },
            {
              "fixed": "9d7490007707f90691911385365bd1d691d99225"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "aa8e15d69f5c0044d5bff61844e163aacc4ac172"
            },
            {
              "fixed": "cab7d949b18b2f1cd625689dc16c5f81236bac93"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "9c89f604476cf15c31fbbdb043cff7fbf1dbe0cb"
            },
            {
              "fixed": "02c10581866d08822c6348e299881485fc546185"
            },
            {
              "fixed": "ccbdc483eb041eef809e9ff223d1ad63518a2c52"
            },
            {
              "fixed": "17ea021ae74987d6064c8195c4922fa025753892"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "a41a0df5d7638acf15e723ad985980b4f7ff9383"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.79"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.12.13"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.13.2"
            },
            {
              "fixed": "6.14"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.14.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90279.json"
  },
  "details": "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).",
  "id": "CVE-2026-90279",
  "modified": "2026-09-19T03:30:45.535256007Z",
  "published": "2026-09-17T16:08:10.654Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/02c10581866d08822c6348e299881485fc546185"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/17ea021ae74987d6064c8195c4922fa025753892"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9d7490007707f90691911385365bd1d691d99225"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cab7d949b18b2f1cd625689dc16c5f81236bac93"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ccbdc483eb041eef809e9ff223d1ad63518a2c52"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90279.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90279"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "md/raid5: round bitmap stripes with sector division"
}