{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-90108", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.787Z", "datePublished": "2026-09-17T16:06:16.813Z", "dateUpdated": "2026-10-19T08:58:06.785Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:58:06.785Z" }, "descriptions": [ { "lang": "en", "value": "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." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/smc/smc_llc.c" ], "versions": [ { "version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196", "lessThan": "7dd55348c0d9399a9448847819e9f3904ae507ad", "status": "affected", "versionType": "git" }, { "version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196", "lessThan": "056395acb7041b3a1f2baa08d89a1938a8b8776a", "status": "affected", "versionType": "git" }, { "version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196", "lessThan": "b08aacfb226a840628151643b6a34eecf545d311", "status": "affected", "versionType": "git" }, { "version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196", "lessThan": "0fb9a513766071ea9d5f3bf988e39241b8e9ee3b", "status": "affected", "versionType": "git" }, { "version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196", "lessThan": "e25a602c45c76a7130878db72bcf6f76df04bf85", "status": "affected", "versionType": "git" }, { "version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196", "lessThan": "036322025d6e440cb75fc6fecbba9a16b271a2ae", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/smc/smc_llc.c" ], "versions": [ { "version": "5.16", "status": "affected" }, { "version": "0", "lessThan": "5.16", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7dd55348c0d9399a9448847819e9f3904ae507ad" }, { "url": "https://git.kernel.org/stable/c/056395acb7041b3a1f2baa08d89a1938a8b8776a" }, { "url": "https://git.kernel.org/stable/c/b08aacfb226a840628151643b6a34eecf545d311" }, { "url": "https://git.kernel.org/stable/c/0fb9a513766071ea9d5f3bf988e39241b8e9ee3b" }, { "url": "https://git.kernel.org/stable/c/e25a602c45c76a7130878db72bcf6f76df04bf85" }, { "url": "https://git.kernel.org/stable/c/036322025d6e440cb75fc6fecbba9a16b271a2ae" } ], "title": "net/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition", "x_generator": { "engine": "bippy-1.2.0" } } } }