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GHSA-R783-4VMJ-F363

Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32

Details

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.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-80984"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-11T20:19:04Z",
    "severity": null
  },
  "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": "GHSA-r783-4vmj-f363",
  "modified": "2026-09-14T15:32:22Z",
  "published": "2026-09-11T21:31:23Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80984"
    },
    {
      "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"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-80984 (GCVE-0-2026-80984)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-14 11:59

Title

net/smc: do not dereference an unset send buffer on the SMC-D teardown path

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.

Severity

No CVSS data available.

Assigner

Linux mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/ab26e12dd5d2f43d9…
https://git.kernel.org/stable/c/e3fcff8d22a6c9540…
https://git.kernel.org/stable/c/f950e1b1f0aad334f…
https://git.kernel.org/stable/c/f517cf02033801a28…
https://git.kernel.org/stable/c/b395dd319cea42223…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 21f6f41e82e59740e26e06e77bdf58dc7f6f08dd , < ab26e12dd5d2f43d939fcf456933a816e81d2e51 (git) Affected: ae2be35cbed2c8385e890147ea321a3fcc3ca5fa , < e3fcff8d22a6c9540748846cd800443a643553a6 (git) Affected: ae2be35cbed2c8385e890147ea321a3fcc3ca5fa , < f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45 (git) Affected: ae2be35cbed2c8385e890147ea321a3fcc3ca5fa , < f517cf02033801a28f98d86ca613a3533cf066b3 (git) Affected: ae2be35cbed2c8385e890147ea321a3fcc3ca5fa , < b395dd319cea422239cb45b998fb38d7e373af87 (git) Affected: 6.6.66 , < 6.6.157 (semver)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.109 , ≤ 6.12.* (semver) Unaffected: 6.18.50 , ≤ 6.18.* (semver) Unaffected: 7.2.4 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/smc/af_smc.c",
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          "versions": [
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "b395dd319cea422239cb45b998fb38d7e373af87",
              "status": "affected",
              "version": "ae2be35cbed2c8385e890147ea321a3fcc3ca5fa",
              "versionType": "git"
            },
            {
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              "version": "6.6.66",
              "versionType": "semver"
            }
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          "programFiles": [
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            "net/smc/smc_tx.h"
          ],
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          "vendor": "Linux",
          "versions": [
            {
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              "version": "6.10"
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              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.109",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.50",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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                  "versionStartIncluding": "6.6.66",
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                },
                {
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          "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": "2026-09-14T11:59:27.804Z",
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          "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",
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    "cveId": "CVE-2026-80984",
    "datePublished": "2026-09-11T19:42:43.573Z",
    "dateReserved": "2026-08-26T14:34:25.811Z",
    "dateUpdated": "2026-09-14T11:59:27.804Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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