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

Vulnerability from cvelistv5 – Published: 2026-09-11 19:42 – Updated: 2026-10-19 08:46
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
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6653 records in the last 180 days details
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)
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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 , ≤ * (original_commit_for_fix)
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        "id": "CVE-2026-80984",
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      "cve": "CVE-2026-80984",
      "id": "CVE-2026-80984",
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      "product_status:known_affected": "110",
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      "source": "Red Hat CSAF VEX",
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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",
      "version": "3"
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}



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