CVE-2026-80984net/smc: do not dereference an unset send buffer on the SMC-D teardown path
- —Not scoredno CVSS score yet
- 0.21%Exploitation in 30 daysEPSS · top 89% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
- 16 days later
· 16 days later
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
No CVSS score yet: neither the CNA, CISA nor NVD has scored this CVE. NVD status: Received.
- EPSS (exploitation in 30 days)
- 0.21% · top 89% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Not scored.
Affected products
- affected 21f6f41e82e59740e26e06e77bdf58dc7f6f08dd – < ab26e12dd5d2f43d939fcf456933a816e81d2e51
- affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa – < e3fcff8d22a6c9540748846cd800443a643553a6
- affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa – < f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45
- affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa – < f517cf02033801a28f98d86ca613a3533cf066b3
- affected ae2be35cbed2c8385e890147ea321a3fcc3ca5fa – < b395dd319cea422239cb45b998fb38d7e373af87
- affected 6.6.66 – < 6.6.157
- affected 6.10
- unaffected < 6.10
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References5
- https://git.kernel.org/stable/c/ab26e12dd5d2f43d939fcf456933a816e81d2e51 (opens in a new tab)
- https://git.kernel.org/stable/c/e3fcff8d22a6c9540748846cd800443a643553a6 (opens in a new tab)
- https://git.kernel.org/stable/c/f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45 (opens in a new tab)
- https://git.kernel.org/stable/c/f517cf02033801a28f98d86ca613a3533cf066b3 (opens in a new tab)
- https://git.kernel.org/stable/c/b395dd319cea422239cb45b998fb38d7e373af87 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76307 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-80984)Record last updated .