netfs: Fix partial invalidation of streaming-write folio

{
  "id": "a71eecfb7d4ca8d0109e8491065ce3b749bb7a4c2b441c0d7ae10aaf3fb5d91b",
  "url": "https://osv.dev/vulnerability/CVE-2026-64157",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "netfs: Fix partial invalidation of streaming-write folio",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: netfs: Fix partial invalidation of streaming-write folio In netfs_invalidate_folio(), if the region of a partial invalidation overlaps the front (but not all) of a dirty write cached in a streaming write page (dirty, but not uptodate, with the dirty region tracked by a netfs_folio struct), the function modifies the dirty region - but incorrectly as it moves the region forward by setting the start to the start, not the end, of the invalidation region. Fix this by setting finfo->dirty_offset to the end of the invalidation region (iend).",
    "evidence": "osv:CVE-2026-64157",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.92",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.34",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.0.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-64157",
      "aliases": [
        "CVE-2026-64157"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "cce6bfa6ca0e30af9927b0074c97fe6a92f28092"
                },
                {
                  "fixed": "f6b2569ae29b666fd15ff2848684c445ba442a39"
                },
                {
                  "fixed": "3d9601c029b934b5b6a10f99791467b10eb6b211"
                },
                {
                  "fixed": "6a3d27116be2c5fb9a03d5cf37c486ac517f3689"
                },
                {
                  "fixed": "6d91acc7fb85d33ea58fca9b964a32a453937f4b"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "6.10.8"
                },
                {
                  "fixed": "6.11"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "e2814004138a541110d4b2dc254a8f619c2c4ce0"
                }
              ]
            }
          ],
          "versions": [
            "v6.10.14",
            "v6.10.13",
            "v6.10.12",
            "v6.10.11",
            "v6.10.10",
            "v6.10.9",
            "v6.10.8"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64157.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.11.0"
                },
                {
                  "fixed": "6.12.92"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.34"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64157.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:43.302423570Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/3d9601c029b934b5b6a10f99791467b10eb6b211",
        "https://git.kernel.org/stable/c/6a3d27116be2c5fb9a03d5cf37c486ac517f3689",
        "https://git.kernel.org/stable/c/6d91acc7fb85d33ea58fca9b964a32a453937f4b",
        "https://git.kernel.org/stable/c/f6b2569ae29b666fd15ff2848684c445ba442a39",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64157.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64157",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64157.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64157",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 510719,
  "published_at": "2026-07-19T15:40:44.964+00:00"
}