ring-buffer: Free cpu_buffer::free_page with subbuf_order

{
  "id": "c2da2c0cf91ae7685eddd52548e91b4401e1317d45a0c4285fc7b4f6ed01d024",
  "url": "https://osv.dev/vulnerability/CVE-2026-89502",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ring-buffer: Free cpu_buffer::free_page with subbuf_order",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Free cpu_buffer::free_page with subbuf_order When sub-buffers use an order greater than 0, cpu_buffer->free_page is allocated with subbuf_order. Use the correct order for cpu_buffer->free_page.",
    "evidence": "osv:CVE-2026-89502",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.109",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89502",
      "aliases": [
        "CVE-2026-89502"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f9b94daa542a8d2532f0930f01cd9aec2d19621b"
                },
                {
                  "fixed": "77275ccea06eaf297e8e6ac3fc830cb72086379a"
                },
                {
                  "fixed": "8c1ecdcdea738efe0494af908f12c0ae3a97fffa"
                },
                {
                  "fixed": "81063bbb16c4fcf0136c9117d5e49d3621dd6a1e"
                },
                {
                  "fixed": "234b1a72e9706fe20c08c96f4374ec8e83b934cb"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89502.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.8.0"
                },
                {
                  "fixed": "6.12.109"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.50"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89502.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:36.541801474Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/234b1a72e9706fe20c08c96f4374ec8e83b934cb",
        "https://git.kernel.org/stable/c/77275ccea06eaf297e8e6ac3fc830cb72086379a",
        "https://git.kernel.org/stable/c/81063bbb16c4fcf0136c9117d5e49d3621dd6a1e",
        "https://git.kernel.org/stable/c/8c1ecdcdea738efe0494af908f12c0ae3a97fffa",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89502.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89502",
        "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/2026/89xxx/CVE-2026-89502.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89502",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 503915,
  "published_at": "2026-09-11T19:43:50.7+00:00"
}