# CVE-2026-80984

## Summary

- **CVE ID:** CVE-2026-80984
- **Severity:** UNKNOWN
- **CVSS Score:** 1.51
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## 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.

## Affected Products

- Linux — Linux (ae2be35cbed2c8385e890147ea321a3fcc3ca5fa)
- Linux — Linux (21f6f41e82e59740e26e06e77bdf58dc7f6f08dd)
- Linux — Linux (6.6.66)
- Linux — Linux (6.10)
- Linux — Linux (0)
- Linux — Linux (6.12.109)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/e3fcff8d22a6c9540748846cd800443a643553a6)
- [CNA](https://git.kernel.org/stable/c/f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45)
- [CNA](https://git.kernel.org/stable/c/f517cf02033801a28f98d86ca613a3533cf066b3)
- [CNA](https://git.kernel.org/stable/c/b395dd319cea422239cb45b998fb38d7e373af87)
- [CNA](https://git.kernel.org/stable/c/ab26e12dd5d2f43d939fcf456933a816e81d2e51)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 10.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-17._