CVE-2026-80984
Low risk· EPSS 10%Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In the Linux kernel, the net/smc module's smc_close_stream_wait() calls smc_tx_prepared_sends() inside its sk_wait_event() condition, which is evaluated 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 leaves the helper dereferencing NULL, faulting out of close(). The fix samples the pointer once in the helper and reports nothing prepared while it is unset.
Risk Assessment
A NULL pointer dereference on the SMC-D socket close path can cause a kernel crash (oops/panic) and denial of service for applications using SMC-D.
Recommendation
Update the Linux kernel to a version containing the fix. Monitor systems using SMC-D for crashes related to socket closure.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS