CVE-2026-90108

{"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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/smc/smc_llc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "7dd55348c0d9399a9448847819e9f3904ae507ad", "status": "affected", "version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196", "versionType": "git"}, {"lessThan": "056395acb7041b3a1f2baa08d89a1938a8b8776a", "status": "affected", "version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196", "versionType": "git"}, {"lessThan": "b08aacfb226a840628151643b6a34eecf545d311", "status": "affected", "version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196", "versionType": "git"}, {"lessThan": "0fb9a513766071ea9d5f3bf988e39241b8e9ee3b", "status": "affected", "version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196", "versionType": "git"}, {"lessThan": "e25a602c45c76a7130878db72bcf6f76df04bf85", "status": "affected", "version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196", "versionType": "git"}, {"lessThan": "036322025d6e440cb75fc6fecbba9a16b271a2ae", "status": "affected", "version": "b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/smc/smc_llc.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.16"}, {"lessThan": "5.16", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.52", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-90108", "lastModified": "2026-10-19T09:19:00.120", "metrics": {}, "published": "2026-09-17T17:17:02.730", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/036322025d6e440cb75fc6fecbba9a16b271a2ae"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/056395acb7041b3a1f2baa08d89a1938a8b8776a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0fb9a513766071ea9d5f3bf988e39241b8e9ee3b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7dd55348c0d9399a9448847819e9f3904ae507ad"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b08aacfb226a840628151643b6a34eecf545d311"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e25a602c45c76a7130878db72bcf6f76df04bf85"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196,7dd55348c0d9399a9448847819e9f3904ae507ad)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196,056395acb7041b3a1f2baa08d89a1938a8b8776a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196,b08aacfb226a840628151643b6a34eecf545d311)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196,0fb9a513766071ea9d5f3bf988e39241b8e9ee3b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196,e25a602c45c76a7130878db72bcf6f76df04bf85)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[b4ba4652b3f8b7c9bbb5786f8acf4724bdab2196,036322025d6e440cb75fc6fecbba9a16b271a2ae)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "5.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,5.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.188,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.157,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.110,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.52,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-20T04:00:09.675560+00:00", "updated": "2026-09-20T05:30:16.598758+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-401"]}