{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-72496",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2026-08-09T03:40:39.937Z",
        "datePublished": "2026-08-15T05:57:29.723Z",
        "dateUpdated": "2026-08-17T05:44:57.739Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-08-17T05:44:57.739Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/bnxt_re: Proper rollback if the ioremap fails\n\nbnxt_qplib_alloc_dpi returns success even if ioremap fails.\nAdd the proper rollback when the ioremap fails and return\n-ENOMEM status."
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:H",
                        "baseScore": 9.2,
                        "baseSeverity": "CRITICAL"
                    },
                    "scenarios": [
                        {
                            "lang": "en",
                            "value": "AV:L - The flaw is reached only through local RDMA uverbs ioctl/write on /dev/infiniband/uverbs* (ibv_alloc_pd and BNXT_RE_ALLOC_WC_PAGE call bnxt_qplib_alloc_dpi); remote RoCE packet handling and in-kernel RDMA target/server paths never invoke this DPI setup routine.\nAC:L - An attacker can induce vmalloc/ioremap failure with local memory pressure, then repeatedly invoke alloc_pd or WC-page allocation; each call deterministically leaves a consumed DPI with NULL dbr, and subsequent create_cq/QP/SRQ doorbell rings fault without races or uncontrollable layout.\nPR:N - ib_uverbs creates per-device character nodes as mode 0666, so any local process can open uverbs, allocate a context, and call alloc_pd or alloc_page without CAP_SYS_ADMIN, init-namespace root, or other elevated capabilities on typical HPC/cloud RDMA hosts.\nUI:N - Exploitation requires only the attacker's own RDMA verbs sequence (alloc_context, alloc_pd or alloc_page, then create_cq/QP/SRQ and I/O); no cooperative action by another user, administrator, or victim mounting devices or opening files is needed.\nS:C - On Kubernetes/HPC hosts exposing bnxt_re to tenant containers or unprivileged RDMA workloads, triggering host-kernel NULL doorbell writes or exhausting finite DPI indices from a workload crosses the container/tenant security boundary to the hypervisor/host authority.\nC:L - Returning success after failed ioremap leaves DPI metadata and a mmapable BAR doorbell offset active while kernel dpi->dbr stays NULL, disclosing doorbell-index/BAR layout to the caller and enabling follow-on corruption when doorbells are later rung.\nI:H - With dpi->dbr left NULL, bnxt_qplib_ring_db and ring_prod_db issue writeq() to NULL during CQ, SQ, RQ, and SRQ doorbell updates on subsequent verbs activity, providing a kernel write primitive and control-flow disruption beyond a benign error return.\nA:H - NULL doorbell writeq faults oops or panic the kernel when CQ/QP/SRQ objects are used after the bogus allocation, and each successful-but-broken DPI allocation permanently consumes a finite doorbell index, enabling repeated denial of RDMA service to other tenants."
                        }
                    ]
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/infiniband/hw/bnxt_re/qplib_res.c"
                    ],
                    "versions": [
                        {
                            "version": "0ac20faf5d837b59fb4c041ea320932ed47fd67f",
                            "lessThan": "303f6fef95df5e5316970746d861cf6daeeca77f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0ac20faf5d837b59fb4c041ea320932ed47fd67f",
                            "lessThan": "87267803a8c824616eb147c5dad7030a5db6f878",
                            "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/hw/bnxt_re/qplib_res.c"
                    ],
                    "versions": [
                        {
                            "version": "6.5",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.5",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.5",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "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": "6.5",
                                    "versionEndExcluding": "7.1.5"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "6.5",
                                    "versionEndExcluding": "7.2"
                                }
                            ]
                        }
                    ]
                }
            ],
            "references": [
                {
                    "url": "https://git.kernel.org/stable/c/303f6fef95df5e5316970746d861cf6daeeca77f"
                },
                {
                    "url": "https://git.kernel.org/stable/c/87267803a8c824616eb147c5dad7030a5db6f878"
                }
            ],
            "title": "RDMA/bnxt_re: Proper rollback if the ioremap fails",
            "x_generator": {
                "engine": "bippy-1.2.0"
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        }
    }
}