{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "ea4c399642b85dc30f44d90ee805c6a18fa03062"
            },
            {
              "fixed": "c98197ee3cd28288da13dc9881bb9e74daa7cbbc"
            },
            {
              "fixed": "08b8630b557828aedb1d9ef0a6e2ec421f334ee2"
            },
            {
              "fixed": "cf3ebd89e754015625fee90aa938f6bc79a2c974"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.18.0"
            },
            {
              "fixed": "6.18.51"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89509.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/ionic: Embed counter driver data in rdma_counter allocation\n\nCommit 7e53b31acc7f (\"RDMA/core: Create and destroy rdma_counter using\nrdma_zalloc_drv_obj()\") requires drivers implementing counter ops to\nembed struct rdma_counter in a driver-specific struct, register its size\nvia INIT_RDMA_OBJ_SIZE, and provide a counter_init callback.\n\nThe ionic driver was merged without this adaptation, causing a NULL\npointer dereference in alloc_and_bind() since rdma_zalloc_drv_obj()\nallocates zero bytes when size_rdma_counter is unset.\n\nConsolidate struct ionic_counter into a new struct ionic_rdma_counter\nthat embeds struct rdma_counter, replace the xarray with a lightweight\nida for ID allocation, and add the required counter_init and\nINIT_RDMA_OBJ_SIZE declarations.",
  "id": "CVE-2026-89509",
  "modified": "2026-09-13T03:31:02.279408677Z",
  "published": "2026-09-11T19:43:55.336Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/08b8630b557828aedb1d9ef0a6e2ec421f334ee2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c98197ee3cd28288da13dc9881bb9e74daa7cbbc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cf3ebd89e754015625fee90aa938f6bc79a2c974"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89509.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89509"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "RDMA/ionic: Embed counter driver data in rdma_counter allocation"
}