{"id":"CVE-2026-90108","revision":"3aa02619aade46baa136ec60524a732a","records":[{"revision":"3aa02619aade46baa136ec60524a732a","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90108","aliases":[],"title":"net/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition\n\nWhen smc_llc_event_handler() transitions the local LLC flow from\nSMC_LLC_FLOW_REQ_ADD_LINK to SMC_LLC_FLOW_ADD_LINK on arrival of an ADD_LINK\nrequest, it calls smc_llc_flow_qentry_set() unconditionally:\n\n\tif (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_REQ_ADD_LINK) {\n\t\tlgr->llc_flow_lcl.type = SMC_LLC_FLOW_ADD_LINK;\n\t\tsmc_llc_flow_qentry_set(&lgr->llc_flow_lcl, qentry);\n\t\t...\n\t}\n\nA CONFIRM_LINK or ADD_LINK_CONT arriving while flow->type is\nSMC_LLC_FLOW_REQ_ADD_LINK is stashed into flow->qentry via the\nSMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT handler (which stores into\nflow->qentry for any non-NONE flow type).  When the subsequent ADD_LINK\narrives, the REQ_ADD_LINK branch overwrites flow->qentry with the new pointer\nwithout first freeing the stashed allocation, leaking one kmalloc object.\n\nThe stashed entry has no consumer: smc_llc_wait() is only called from\nllc_add_link_work, which is not yet scheduled while the flow type remains\nREQ_ADD_LINK.  No waiter is sleeping on llc_msg_waiter at this point.\nIt is safe to unconditionally free any stashed qentry before\nthe overwrite.\n\nCall smc_llc_flow_qentry_del() before smc_llc_flow_qentry_set() in the\nREQ_ADD_LINK branch.  smc_llc_flow_qentry_del() already checks flow->qentry\nbefore freeing, so the normal path where no entry is stashed is a no-op.","state":0,"publishedAt":"2026-09-17T16:06:16.813+00:00","modifiedAt":"2026-10-19T08:58:06.785+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/smc_llc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196\",\n                            \"lessThan\": \"7dd55348c0d9399a9448847819e9f3904ae507ad\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196\",\n                            \"lessThan\": \"056395acb7041b3a1f2baa08d89a1938a8b8776a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196\",\n                            \"lessThan\": \"b08aacfb226a840628151643b6a34eecf545d311\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196\",\n                            \"lessThan\": \"0fb9a513766071ea9d5f3bf988e39241b8e9ee3b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196\",\n                            \"lessThan\": \"e25a602c45c76a7130878db72bcf6f76df04bf85\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196\",\n                            \"lessThan\": \"036322025d6e440cb75fc6fecbba9a16b271a2ae\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\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/smc_llc.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.16\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.16\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\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\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.52\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.6\",\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/7dd55348c0d9399a9448847819e9f3904ae507ad","https://git.kernel.org/stable/c/056395acb7041b3a1f2baa08d89a1938a8b8776a","https://git.kernel.org/stable/c/b08aacfb226a840628151643b6a34eecf545d311","https://git.kernel.org/stable/c/0fb9a513766071ea9d5f3bf988e39241b8e9ee3b","https://git.kernel.org/stable/c/e25a602c45c76a7130878db72bcf6f76df04bf85","https://git.kernel.org/stable/c/036322025d6e440cb75fc6fecbba9a16b271a2ae"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90108","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90108","identifiers":["CVE-2026-90108"]},"retained":false,"historicalAffected":[]}],"coverage":[]}