svcrdma: Reorder rpcrdma_rn_unregister before rdma_destroy_id

{
  "id": "287dc32602445eca3a5abf09b6327caa7704d66eebba57ae1976b7197d75268f",
  "url": "https://osv.dev/vulnerability/CVE-2026-89535",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "svcrdma: Reorder rpcrdma_rn_unregister before rdma_destroy_id",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: svcrdma: Reorder rpcrdma_rn_unregister before rdma_destroy_id svc_rdma_free() caches rdma->sc_cm_id->device before teardown, then calls rdma_destroy_id(sc_cm_id) which frees the cm_id. rpcrdma_rn_unregister() follows, but between those two calls the transport's sc_rn entry is still installed in the device's rd_xa. A concurrent ib_unregister_device walk can dispatch svc_rdma_xprt_done() against the now-freed sc_cm_id. Move rpcrdma_rn_unregister() before rdma_destroy_id() so the transport's notification entry is removed from the xarray before the cm_id it references is destroyed. Also guard the sc_cm_id dereference with a NULL check: the following patches introduce paths that reach svc_rdma_free() with sc_cm_id == NULL (listener create failure, ADDR_CHANGE replacement failure).",
    "evidence": "osv:CVE-2026-89535",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.111",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.51",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-89535",
      "aliases": [
        "CVE-2026-89535"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:N/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": "c4de97f7c45434985e5dbf2d6ccc9eca676e37fe"
                },
                {
                  "fixed": "fcd4a752ac840d39356f4d2a424d3aca4e39716b"
                },
                {
                  "fixed": "9f2f5d0999364c7070306cd422d8babc2621070d"
                },
                {
                  "fixed": "cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9"
                },
                {
                  "fixed": "4488e912973773d64368828acf3b8e39d93650ae"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89535.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.12.0"
                },
                {
                  "fixed": "6.12.111"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.51"
                }
              ]
            },
            {
              "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-2026-89535.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.322302728Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4488e912973773d64368828acf3b8e39d93650ae",
        "https://git.kernel.org/stable/c/9f2f5d0999364c7070306cd422d8babc2621070d",
        "https://git.kernel.org/stable/c/cfca6eb3345ba4a23cf9a1153ad09bf19faabfc9",
        "https://git.kernel.org/stable/c/fcd4a752ac840d39356f4d2a424d3aca4e39716b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89535.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89535",
        "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-2026-89535.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89535",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499609,
  "published_at": "2026-09-11T19:44:13.733+00:00"
}