ring-buffer: Prevent subbuf order change when resizing is disabled

{
  "id": "512f856dfbfac8c8a54b7b5117ee1a5c4a08c4c0143cbf09b86c72cf1cd46d04",
  "url": "https://osv.dev/vulnerability/CVE-2026-74634",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ring-buffer: Prevent subbuf order change when resizing is disabled",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Prevent subbuf order change when resizing is disabled Because ring_buffer_subbuf_order_set() frees buffer pages, we can't allow it when resizing is disabled. A non-consuming reader is at risk of use-after-free (rb_advance_iter()). Return -EBUSY on resize_disabled, matching ring_buffer_resize() behaviour.",
    "evidence": "osv:CVE-2026-74634",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.104",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.45",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-74634",
      "aliases": [
        "CVE-2026-74634"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "f9b94daa542a8d2532f0930f01cd9aec2d19621b"
                },
                {
                  "fixed": "b45b91db41379ee5fb36c187d6d7c37b725cbe8e"
                },
                {
                  "fixed": "62978cf6347972c04130e4e841ba404504d92b32"
                },
                {
                  "fixed": "7568e9e717e7540bd05bcc007f5d76fcaff3cdff"
                },
                {
                  "fixed": "bf98d7b0d5a99991e47e66cee4eb1d3fa514be97"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74634.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.8.0"
                },
                {
                  "fixed": "6.12.104"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.45"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74634.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.125957288Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/62978cf6347972c04130e4e841ba404504d92b32",
        "https://git.kernel.org/stable/c/7568e9e717e7540bd05bcc007f5d76fcaff3cdff",
        "https://git.kernel.org/stable/c/b45b91db41379ee5fb36c187d6d7c37b725cbe8e",
        "https://git.kernel.org/stable/c/bf98d7b0d5a99991e47e66cee4eb1d3fa514be97",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74634.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74634",
        "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/2026/74xxx/CVE-2026-74634.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74634",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499120,
  "published_at": "2026-08-22T15:32:14.547+00:00"
}