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

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-09-14 11:59
VLAI
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
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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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Show details on NVD website
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        "id": "CVE-2026-80984",
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      "cve": "CVE-2026-80984",
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      "product_status:known_affected": "185",
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      "title": "kernel: net/smc: do not dereference an unset send buffer on the SMC-D teardown path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80984.json",
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      "cve": "CVE-2026-80984",
      "id": "CVE-2026-80984",
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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.