RDMA/uverbs: Guard legacy bundles without method_elm

{
  "id": "ed72096f473d9bfd154b35fb643577457eac86376f1d4fea1cf70d6b678f1aec",
  "url": "https://osv.dev/vulnerability/CVE-2026-89505",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "RDMA/uverbs: Guard legacy bundles without method_elm",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: RDMA/uverbs: Guard legacy bundles without method_elm The legacy write() path dispatches through a uverbs_api_write_method, but the uverbs_attr_bundle passed to provider code does not have an ioctl method element. If malformed provider input causes the common uverbs validation code to emit an error message, uverbs_get_handler_fn() dereferences the uninitialized method_elm pointer. Initialize method_elm explicitly for legacy bundles and make uverbs_get_handler_fn() return NULL when no ioctl method is present. The legacy dispatcher continues to use its local write method, while the ioctl path continues to use the registered ioctl handler.",
    "evidence": "osv:CVE-2026-89505",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-89505",
      "aliases": [
        "CVE-2026-89505"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "7122ff96068a03595bde2fbafaca82ca2ed8084e"
                },
                {
                  "fixed": "edae84e5461749ed9adf9fcf5c6e075381040ac3"
                },
                {
                  "fixed": "60a42d510113f46de47e86a84bf5758597644487"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89505.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.1.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89505.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.043062202Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/60a42d510113f46de47e86a84bf5758597644487",
        "https://git.kernel.org/stable/c/edae84e5461749ed9adf9fcf5c6e075381040ac3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89505.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89505",
        "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-2026-89505.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89505",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 517560,
  "published_at": "2026-09-11T19:43:52.69+00:00"
}