{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "21f6f41e82e59740e26e06e77bdf58dc7f6f08dd"
            },
            {
              "fixed": "ab26e12dd5d2f43d939fcf456933a816e81d2e51"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "ae2be35cbed2c8385e890147ea321a3fcc3ca5fa"
            },
            {
              "fixed": "e3fcff8d22a6c9540748846cd800443a643553a6"
            },
            {
              "fixed": "f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45"
            },
            {
              "fixed": "f517cf02033801a28f98d86ca613a3533cf066b3"
            },
            {
              "fixed": "b395dd319cea422239cb45b998fb38d7e373af87"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.6.66"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.10.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80984.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: do not dereference an unset send buffer on the SMC-D teardown path\n\nsmc_close_stream_wait() calls smc_tx_prepared_sends() from inside its\nsk_wait_event() condition, and sk_wait_event() evaluates that condition\nonce with the socket lock released. smcd_buf_detach() clears\nconn-\u003esndbuf_desc from smc_conn_kill() under lock_sock(), so a link group\nterminating while a socket waits there leaves the helper dereferencing\nNULL, faulting out of close(). SIOCOUTQ reads the field by hand, and\nsmc_close_cancel_work() drops the lock across two cancel_*_sync() calls.\n\nSample the pointer once in the helper, report nothing prepared while it is\nunset, and bound the ioctl the same way. The receive tasklet dereferences\nthe field directly in smc_cdc_msg_recv_action(), not through this helper;\n1/2 is what keeps it from running that late.",
  "id": "CVE-2026-80984",
  "modified": "2026-09-15T03:30:31.693638879Z",
  "published": "2026-09-11T19:42:43.573Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab26e12dd5d2f43d939fcf456933a816e81d2e51"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b395dd319cea422239cb45b998fb38d7e373af87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e3fcff8d22a6c9540748846cd800443a643553a6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f517cf02033801a28f98d86ca613a3533cf066b3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80984.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80984"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "net/smc: do not dereference an unset send buffer on the SMC-D teardown path"
}