{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196"
            },
            {
              "fixed": "7dd55348c0d9399a9448847819e9f3904ae507ad"
            },
            {
              "fixed": "056395acb7041b3a1f2baa08d89a1938a8b8776a"
            },
            {
              "fixed": "b08aacfb226a840628151643b6a34eecf545d311"
            },
            {
              "fixed": "0fb9a513766071ea9d5f3bf988e39241b8e9ee3b"
            },
            {
              "fixed": "e25a602c45c76a7130878db72bcf6f76df04bf85"
            },
            {
              "fixed": "036322025d6e440cb75fc6fecbba9a16b271a2ae"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90108.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition\n\nWhen smc_llc_event_handler() transitions the local LLC flow from\nSMC_LLC_FLOW_REQ_ADD_LINK to SMC_LLC_FLOW_ADD_LINK on arrival of an ADD_LINK\nrequest, it calls smc_llc_flow_qentry_set() unconditionally:\n\n\tif (lgr-\u003ellc_flow_lcl.type == SMC_LLC_FLOW_REQ_ADD_LINK) {\n\t\tlgr-\u003ellc_flow_lcl.type = SMC_LLC_FLOW_ADD_LINK;\n\t\tsmc_llc_flow_qentry_set(\u0026lgr-\u003ellc_flow_lcl, qentry);\n\t\t...\n\t}\n\nA CONFIRM_LINK or ADD_LINK_CONT arriving while flow-\u003etype is\nSMC_LLC_FLOW_REQ_ADD_LINK is stashed into flow-\u003eqentry via the\nSMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT handler (which stores into\nflow-\u003eqentry for any non-NONE flow type).  When the subsequent ADD_LINK\narrives, the REQ_ADD_LINK branch overwrites flow-\u003eqentry with the new pointer\nwithout first freeing the stashed allocation, leaking one kmalloc object.\n\nThe stashed entry has no consumer: smc_llc_wait() is only called from\nllc_add_link_work, which is not yet scheduled while the flow type remains\nREQ_ADD_LINK.  No waiter is sleeping on llc_msg_waiter at this point.\nIt is safe to unconditionally free any stashed qentry before\nthe overwrite.\n\nCall smc_llc_flow_qentry_del() before smc_llc_flow_qentry_set() in the\nREQ_ADD_LINK branch.  smc_llc_flow_qentry_del() already checks flow-\u003eqentry\nbefore freeing, so the normal path where no entry is stashed is a no-op.",
  "id": "CVE-2026-90108",
  "modified": "2026-09-18T03:30:43.536013537Z",
  "published": "2026-09-17T16:06:16.813Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/036322025d6e440cb75fc6fecbba9a16b271a2ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/056395acb7041b3a1f2baa08d89a1938a8b8776a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0fb9a513766071ea9d5f3bf988e39241b8e9ee3b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7dd55348c0d9399a9448847819e9f3904ae507ad"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b08aacfb226a840628151643b6a34eecf545d311"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e25a602c45c76a7130878db72bcf6f76df04bf85"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90108.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90108"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition"
}