CVE-2026-80984
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 versions
Linux kernel versions
6.6.66,
6.10
and later are affected. Fixed in
6.6.157,
6.12.109,
6.18.50,
7.2.4,
7.3-rc1
and their respective stable series.
References
5 totalFrequently asked questions
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What is CVE-2026-80984?
CVE-2026-80984 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.6.66 onward and has been patched in 6.6.157, 6.12.109, 6.18.50 and others. CVE-2026-80984 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-80984?
Yes. CVE-2026-80984 has been patched. Fixed versions include 6.6.157, 6.12.109, 6.18.50 and others. If you are running Linux kernel 6.6.66 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-80984 actively exploited?
No. CVE-2026-80984 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.