{"id":"CVE-2026-80984","revision":"44d7b88369f5476882e2fa46570733f3","records":[{"revision":"44d7b88369f5476882e2fa46570733f3","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-80984","aliases":[],"title":"net/smc: do not dereference an unset send buffer on the SMC-D teardown path","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: do not dereference an unset send buffer on the SMC-D teardown path\n\nsmc_close_stream_wait() calls smc_tx_prepared_sends() from inside its\nsk_wait_event() condition, and sk_wait_event() evaluates that condition\nonce with the socket lock released. smcd_buf_detach() clears\nconn->sndbuf_desc from smc_conn_kill() under lock_sock(), so a link group\nterminating while a socket waits there leaves the helper dereferencing\nNULL, faulting out of close(). SIOCOUTQ reads the field by hand, and\nsmc_close_cancel_work() drops the lock across two cancel_*_sync() calls.\n\nSample the pointer once in the helper, report nothing prepared while it is\nunset, and bound the ioctl the same way. The receive tasklet dereferences\nthe field directly in smc_cdc_msg_recv_action(), not through this helper;\n1/2 is what keeps it from running that late.","state":0,"publishedAt":"2026-09-11T19:42:43.573+00:00","modifiedAt":"2026-10-19T08:46:08.671+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/smc/af_smc.c\",\n                        \"net/smc/smc_tx.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"21f6f41e82e59740e26e06e77bdf58dc7f6f08dd\",\n                            \"lessThan\": \"ab26e12dd5d2f43d939fcf456933a816e81d2e51\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ae2be35cbed2c8385e890147ea321a3fcc3ca5fa\",\n                            \"lessThan\": \"e3fcff8d22a6c9540748846cd800443a643553a6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ae2be35cbed2c8385e890147ea321a3fcc3ca5fa\",\n                            \"lessThan\": \"f950e1b1f0aad334f9a9ee552c4dd5b794ebdd45\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ae2be35cbed2c8385e890147ea321a3fcc3ca5fa\",\n                            \"lessThan\": \"f517cf02033801a28f98d86ca613a3533cf066b3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"ae2be35cbed2c8385e890147ea321a3fcc3ca5fa\",\n                            \"lessThan\": \"b395dd319cea422239cb45b998fb38d7e373af87\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"6.6.66\",\n                            \"lessThan\": \"6.6.157\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/smc/af_smc.c\",\n                        \"net/smc/smc_tx.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80984","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-80984","identifiers":["CVE-2026-80984"]},"retained":false,"historicalAffected":[]}],"coverage":[]}