{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0c493b5cf16e28d761b6e77c7c32aa0e7af70813"
            },
            {
              "fixed": "a442c258320b689f13d2205eaeeddf8b0e630288"
            },
            {
              "fixed": "1f646e23372f3444dc5f0bcb5404a49d26756add"
            },
            {
              "fixed": "0ffc032294a29601b1019dba91aa1a930d90df17"
            },
            {
              "fixed": "a192b6c149c6ea10cc88869accb78165eb454456"
            },
            {
              "fixed": "27934d02cbeb8a957dd11c985a579e58d30c5270"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.3.0"
            },
            {
              "fixed": "6.6.148"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72132.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFS: Charge unstable writes by request size, not folio size\n\nnfs_folio_mark_unstable() and nfs_folio_clear_commit() charge and\nuncharge NR_WRITEBACK/WB_WRITEBACK by folio_nr_pages(folio) once per\n*request* added to or removed from a commit list. This is correct only\nwhen a folio has a single associated request. When pg_test splits a\nfolio into N sub-folio requests (e.g. pNFS flexfiles striping with a\nstripe unit smaller than the folio size, or plain wsize-limited\nsplitting), each of the N requests independently charges the whole\nfolio's page count, inflating the accounting by a factor of N per\nfolio. With large folios and small stripe units this reaches multiple\norders of magnitude: a 2 MiB folio split into 512 4 KiB requests can\ncharge up to 512x its real size, pushing global dirty+writeback\naccounting past the system's dirty threshold and forcing every\nbuffered writer on the host into the hard-throttle path, including\nunrelated in-kernel NFS server threads sharing the box.\n\nCharge each request only for the pages it actually covers.",
  "id": "CVE-2026-72132",
  "modified": "2026-08-18T03:31:04.692177448Z",
  "published": "2026-08-15T05:53:08.096Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0ffc032294a29601b1019dba91aa1a930d90df17"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f646e23372f3444dc5f0bcb5404a49d26756add"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/27934d02cbeb8a957dd11c985a579e58d30c5270"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a192b6c149c6ea10cc88869accb78165eb454456"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a442c258320b689f13d2205eaeeddf8b0e630288"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72132.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72132"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "NFS: Charge unstable writes by request size, not folio size"
}