CVE-2026-80984 (GCVE-0-2026-80984)
Vulnerability from cvelistv5
Published
2026-09-11 19:42
Modified
2026-10-19 08:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: do not dereference an unset send buffer on the SMC-D teardown path smc_close_stream_wait() calls smc_tx_prepared_sends() from inside its sk_wait_event() condition, and sk_wait_event() evaluates that condition once with the socket lock released. smcd_buf_detach() clears conn->sndbuf_desc from smc_conn_kill() under lock_sock(), so a link group terminating while a socket waits there leaves the helper dereferencing NULL, faulting out of close(). SIOCOUTQ reads the field by hand, and smc_close_cancel_work() drops the lock across two cancel_*_sync() calls. Sample the pointer once in the helper, report nothing prepared while it is unset, and bound the ioctl the same way. The receive tasklet dereferences the field directly in smc_cdc_msg_recv_action(), not through this helper; 1/2 is what keeps it from running that late.
References
Impacted products
Vendor Product Version
Linux Linux Version: 21f6f41e82e59740e26e06e77bdf58dc7f6f08dd
Version: ae2be35cbed2c8385e890147ea321a3fcc3ca5fa
Version: ae2be35cbed2c8385e890147ea321a3fcc3ca5fa
Version: ae2be35cbed2c8385e890147ea321a3fcc3ca5fa
Version: ae2be35cbed2c8385e890147ea321a3fcc3ca5fa
Version: 6.6.66   ≤
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{
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          "defaultStatus": "unaffected",
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          "programFiles": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:46:08.671Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ab26e12dd5d2f43d939fcf456933a816e81d2e51"
        },
        {
          "url": "https://git.kernel.org/stable/c/e3fcff8d22a6c9540748846cd800443a643553a6"
        },
        {
          "url": "https://git.kernel.org/stable/c/f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45"
        },
        {
          "url": "https://git.kernel.org/stable/c/f517cf02033801a28f98d86ca613a3533cf066b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/b395dd319cea422239cb45b998fb38d7e373af87"
        }
      ],
      "title": "net/smc: do not dereference an unset send buffer on the SMC-D teardown path",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80984",
    "datePublished": "2026-09-11T19:42:43.573Z",
    "dateReserved": "2026-08-26T14:34:25.811Z",
    "dateUpdated": "2026-10-19T08:46:08.671Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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