{"api_version":"1","generated_at":"2026-10-15T23:43:34+00:00","cve":"CVE-2023-54168","urls":{"html":"https://cve.report/CVE-2023-54168","api":"https://cve.report/api/cve/CVE-2023-54168.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2023-54168","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-54168"},"summary":{"title":"RDMA/mlx4: Prevent shift wrapping in set_user_sq_size()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx4: Prevent shift wrapping in set_user_sq_size()\n\nThe ucmd->log_sq_bb_count variable is controlled by the user so this\nshift can wrap.  Fix it by using check_shl_overflow() in the same way\nthat it was done in commit 515f60004ed9 (\"RDMA/hns: Prevent undefined\nbehavior in hns_roce_set_user_sq_size()\").","state":"PUBLISHED","assigner":"Linux","published_at":"2025-12-30 13:16:04","updated_at":"2026-10-15 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the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx4: Prevent shift wrapping in set_user_sq_size()\n\nThe ucmd->log_sq_bb_count variable is controlled by the user so this\nshift can wrap.  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No remote peer or network packet participates in reaching `set_user_sq_size()`.\nAC:L - Triggering is fully deterministic — the attacker simply sets `log_sq_bb_count` to 31 (or 63/95/…/255) in the create-QP command; no race, timing window, or memory-layout condition is involved, and the resulting QP context is programmed on every attempt.\nPR:L - No `capable()` or capability gate exists anywhere along `ib_uverbs_open` → `ib_uverbs_create_qp` → `create_qp_common`; access is controlled purely by the uverbs device node, which rdma-core's udev rules ship as mode 0666, so any unprivileged local account (including inside a container, since RDMA devices default to shared net-ns mode) can issue the malformed create-QP.\nUI:N - The whole sequence — create QP with the wrapped shift, then modify to INIT/RTR/RTS and ring the send doorbell — is driven entirely by the attacker's own process. No victim action is needed.\nS:U - The bypassed sanity check, the corrupted `mlx4_ib_qp` state, and the resulting device errors all remain under the host kernel's security authority; no hypervisor, IOMMU, or sandbox boundary is crossed by the defect itself.\nC:H - The bypass programs the QP context with a 2 MB send queue against an MTT allocation as small as one page, so the adapter translates send-WQE fetches through MTT entries belonging to other RDMA objects — including other processes' pinned registrations — yielding a large, unbounded out-of-bounds read at the DMA layer rather than a few stray bytes.\nI:H - The same out-of-range translation window lets the device act on work-queue entries fetched from memory outside the registered buffer, and `qp->sq.wqe_cnt` becoming `INT_MIN` corrupts the QP context (spuriously setting the `sq_no_prefetch` bit and a maximal `log_sq_size`), giving attacker-induced modification of kernel and device state well beyond the QP's own resources.\nA:H - This re-exposes exactly the crash that commit 839041329fd3 added the check to prevent (\"arbitrarily large/small values … can crash the kernel\"); accesses beyond the mapped MTT produce local-access/QP-operation errors and can escalate to a catastrophic adapter error and `mlx4_catas_error()` reset, killing InfiniBand and Ethernet for every user of the ConnectX-3 NIC, and the shift itself panics a `CONFIG_UBSAN_SHIFT` + `panic_on_warn` kernel."}]}],"providerMetadata":{"dateUpdated":"2026-08-05T09:17:49.049Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/3d5ae269c4bd392ec1edbfb3bd031b8f42d7feff"},{"url":"https://git.kernel.org/stable/c/8feca625900777e02a449e53fe4121339934c38a"},{"url":"https://git.kernel.org/stable/c/9ad3221c86cc9c6305594b742d4a72dfbd4ea579"},{"url":"https://git.kernel.org/stable/c/9911be2155720221a4f1f722b22bd0e2388d8bcf"},{"url":"https://git.kernel.org/stable/c/3ce0df3493277b9df275cb8455d9c677ae701230"},{"url":"https://git.kernel.org/stable/c/196a6df08b08699ace4ce70e1efcdd9081b6565f"},{"url":"https://git.kernel.org/stable/c/a183905869e692b6b7805b7472235585eff8e429"},{"url":"https://git.kernel.org/stable/c/d50b3c73f1ac20dabc53dc6e9d64ce9c79a331eb"}],"title":"RDMA/mlx4: Prevent shift wrapping in set_user_sq_size()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2023-54168","datePublished":"2025-12-30T12:08:43.394Z","dateReserved":"2025-12-30T12:06:44.495Z","dateUpdated":"2026-10-15T21:41:40.726Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2025-12-30 13:16:04","lastModifiedDate":"2026-10-15 22:17:54","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"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","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-15T21:38:50.339644Z","id":"CVE-2023-54168","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2023","CveId":"54168","Ordinal":"1","Title":"RDMA/mlx4: Prevent shift wrapping in set_user_sq_size()","CVE":"CVE-2023-54168","Year":"2023"},"notes":[{"CveYear":"2023","CveId":"54168","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx4: Prevent shift wrapping in set_user_sq_size()\n\nThe ucmd->log_sq_bb_count variable is controlled by the user so this\nshift can wrap.  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