CVE-2026-80984net/smc: do not dereference an unset send buffer on the SMC-D teardown path
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 14, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 21f6f41e82e59740e26e06e77bdf58dc7f6f08dd before ab26e12dd5d2f43d939fcf456933a816e81d2e51; from ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before e3fcff8d22a6c9540748846cd800443a643553a6; from ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45; from ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before f517cf02033801a28f98d86ca613a3533cf066b3; from ae2be35cbed2c8385e890147ea321a3fcc3ca5fa before b395dd319cea422239cb45b998fb38d7e373af87; from 6.6.66 before 6.6.157 | CNA record |
References
- https://git.kernel.org/stable/c/ab26e12dd5d2f43d939fcf456933a816e81d2e51
- https://git.kernel.org/stable/c/e3fcff8d22a6c9540748846cd800443a643553a6
- https://git.kernel.org/stable/c/f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45
- https://git.kernel.org/stable/c/f517cf02033801a28f98d86ca613a3533cf066b3
- https://git.kernel.org/stable/c/b395dd319cea422239cb45b998fb38d7e373af87
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.