{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98367", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.344Z", "datePublished": "2026-10-06T08:46:52.452Z", "dateUpdated": "2026-10-19T09:18:19.262Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:18:19.262Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: Clear association under lock if siw_qp_modify fails in siw_accept\n\nWe need to clear cep before release state_lock as siw_qp_llp_close and\nsiw_qp_modify->siw_qp_llp_close did.\n\nOtherwise if siw_qp_modify() fails in siw_accept(), the QP's state_lock\nis released before the error path cleanup. A concurrent ibv_modify_qp()\ntransitioning the QP to ERROR can race in this window:\n\n siw_accept() ibv_modify_qp(ERROR)\n ---------------------- ----------------------\n siw_qp_modify() fails\n up_write(&qp->state_lock)\n down_write(&qp->state_lock)\n nextstate_from_idle():\n\t\t\t\t if (qp->cep)\n siw_cep_put(qp->cep) <- frees cep\n qp->cep = NULL\n goto error\n cep->qp = NULL <- UAF\n\nClear qp->cep and drop the association reference taken by siw_cep_get(),\nall under the write lock held from the initial down_write(&qp->state_lock).\nThread B therefore sees qp->cep == NULL, skips its own put, and cannot free\nthe cep before siw_accept() is done with it." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - siw_accept() is called through the ops.iw_accept hook from iw_cm_accept(), which a local process reaches with the RDMA_USER_CM_CMD_ACCEPT command on /dev/infiniband/rdma_cm. The racing side is the uverbs MODIFY_QP command (ibv_modify_qp to ERROR), also local. No wire message carries data that causes the siw_qp_modify() failure, so the attack is local.\nAC:L - The attacker does control both racing threads, since it owns the QP and issues the accept and modify_qp calls itself. Even so, AC is High: in siw_accept the only way siw_qp_modify() can fail is siw_qp_readq_init() hitting a vcalloc() ENOMEM, and IRD/ORD are capped at 128, so the allocations are small. That failure depends on system-wide memory exhaustion, which the attacker cannot produce on demand.\nPR:L - Running rdma_accept and ibv_modify_qp on a QP the user created on an existing siw device needs only ordinary access to the rdma_cm and uverbs device nodes. Creating the siw link through RDMA_NLDEV_CMD_NEWLINK is admin-only, but no privilege is needed to use a device that already exists.\nUI:N - The attacker drives both siw_accept() and the concurrent ibv_modify_qp(ERROR) through their own rdma_cm and verbs calls, and the connecting peer can be the attacker over loopback. No other user has to do anything.\nS:U - The freed siw_cep and the writes into it both stay inside the kernel's own security authority. No VM, IOMMU or sandbox boundary is crossed.\nC:H - siw_qp_nextstate_from_idle() frees the siw_cep by calling siw_cep_put(qp->cep). The error path in siw_accept() then keeps using that freed object: it writes cep->qp = NULL, runs siw_free_cm_id, and calls siw_cep_set_free_and_put. A reclaimed object in that slot gives the attacker a use-after-free primitive that can be built into a kernel memory leak.\nI:H - After the free, the error path writes cep->qp = NULL and does kref and lock operations on the dead siw_cep. That corrupts whatever object has taken over the slot, and this kind of UAF write can be used to corrupt kernel data or hijack control flow.\nA:H - A kref_put or lock operation on the freed siw_cep in siw_cep_set_free_and_put can corrupt the slab or oops the kernel, and that crashes the host." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/sw/siw/siw_cm.c" ], "versions": [ { "version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7", "lessThan": "f11e09fe2fc3a11ccdf8f932b68181b0bb1d2078", "status": "affected", "versionType": "git" }, { "version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7", "lessThan": "e3f039082856adab7e195dea1af45d93dd6a3f1c", "status": "affected", "versionType": "git" }, { "version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7", "lessThan": "ad50d19f3d1ce052b3a146143581e930a1efb33e", "status": "affected", "versionType": "git" }, { "version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7", "lessThan": "030306bbb9273af80f14d7af20129661964cd9a7", "status": "affected", "versionType": "git" }, { "version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7", "lessThan": "df2584750314336edcbcc21fb388e04b260f35b7", "status": "affected", "versionType": "git" }, { "version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7", "lessThan": "9dcc0f4e488b70cff81e0e5717a498c929cf5de3", "status": "affected", "versionType": "git" }, { "version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7", "lessThan": "bfdc744bf20ae4c3ef2e470298de5237c5c9a13c", "status": "affected", "versionType": "git" }, { "version": "6c52fdc244b5ccc468006fd65a504d4ee33743c7", "lessThan": "32cd87f54dd1070020e664ccb0312a9f0fea79b4", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/infiniband/sw/siw/siw_cm.c" ], "versions": [ { "version": "5.3", "status": "affected" }, { "version": "0", "lessThan": "5.3", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.54", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.8", "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": "5.3", "versionEndExcluding": "5.10.271" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "5.15.222" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "6.18.54" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "7.2.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f11e09fe2fc3a11ccdf8f932b68181b0bb1d2078" }, { "url": "https://git.kernel.org/stable/c/e3f039082856adab7e195dea1af45d93dd6a3f1c" }, { "url": "https://git.kernel.org/stable/c/ad50d19f3d1ce052b3a146143581e930a1efb33e" }, { "url": "https://git.kernel.org/stable/c/030306bbb9273af80f14d7af20129661964cd9a7" }, { "url": "https://git.kernel.org/stable/c/df2584750314336edcbcc21fb388e04b260f35b7" }, { "url": "https://git.kernel.org/stable/c/9dcc0f4e488b70cff81e0e5717a498c929cf5de3" }, { "url": "https://git.kernel.org/stable/c/bfdc744bf20ae4c3ef2e470298de5237c5c9a13c" }, { "url": "https://git.kernel.org/stable/c/32cd87f54dd1070020e664ccb0312a9f0fea79b4" } ], "title": "RDMA/siw: Clear association under lock if siw_qp_modify fails in siw_accept", "x_generator": { "engine": "bippy-1.2.0" } } } }