RDMA/core: Validate cpu_id against nr_cpu_ids in DMAH alloc_CVE-2026-53187

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Validate cpu_id against nr_cpu_ids in DMAH alloc\n\nThe cpu_id attribute supplied by user space through\nUVERBS_ATTR_ALLOC_DMAH_CPU_ID is passed directly to cpumask_test_cpu()\nwithout first verifying that the value is within the valid CPU range.\n\nPassing such untrusted data to cpumask_test_cpu() may lead to an\nout-of-bounds read of the underlying cpumask bitmap: the helper expands\nto a test_bit() that indexes the bitmap by cpu_id / BITS_PER_LONG with\nno bound check.\n\nIn addition, on kernels built with CONFIG_DEBUG_PER_CPU_MAPS it trips\nthe WARN_ON_ONCE() in cpumask_check(); combined with panic_on_warn this\nturns a bad user input into a machine reboot.\n\nReject any cpu_id that is not smaller than nr_cpu_ids with -EINVAL\nbefore it is used.\n\nReported by Smatch.",
    "published": "2026-06-25T08:39:00.175Z",
    "modified": "2026-06-28T06:40:02.982Z",
    "type": "cve",
    "title": "RDMA/core: Validate cpu_id against nr_cpu_ids in DMAH alloc",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/bd5e818be7964c1689fba2dad9e6bd3a827fee74\nhttps://git.kernel.org/stable/c/0efbb6b54ff56300867027d8e0800d0e32226a20\nhttps://git.kernel.org/stable/c/323c98a4ff06aa28114f2bf658fb43eb3b536bbc",
    "id": "CVE-2026-53187",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux d83edab562a496a42720902a1d2effccd05c37c5\nLinux Linux d83edab562a496a42720902a1d2effccd05c37c5\nLinux Linux d83edab562a496a42720902a1d2effccd05c37c5\nLinux Linux 6.17",
    "sourceHref": "",
    "cvss": {
        "score": 7.1,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "baseScore": 0,
        "baseSeverity": "",
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        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
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            "baseScore": 0,
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "d83edab562a496a42720902a1d2effccd05c37c5",
    "vendor": "Linux",
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    "ai_score": 0
}