iommu/amd: move wait_on_sem() out of spinlock_CVE-2026-43253

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/amd: move wait_on_sem() out of spinlock\n\nWith iommu.strict=1, the existing completion wait path can cause soft\nlockups under stressed environment, as wait_on_sem() busy-waits under the\nspinlock with interrupts disabled.\n\nMove the completion wait in iommu_completion_wait() out of the spinlock.\nwait_on_sem() only polls the hardware-updated cmd_sem and does not require\niommu->lock, so holding the lock during the busy wait unnecessarily\nincreases contention and extends the time with interrupts disabled.",
    "published": "2026-05-06T11:28:43.160Z",
    "modified": "2026-05-08T12:41:36.238Z",
    "type": "cve",
    "title": "iommu/amd: move wait_on_sem() out of spinlock",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/f2f65b28d802a667119147444ec2ae33eebf9a58\nhttps://git.kernel.org/stable/c/715c263119fd1b918a9fcbd8a36ea5b604a46324\nhttps://git.kernel.org/stable/c/e15768e68820142077bbca402d8e902f64ade1b0\nhttps://git.kernel.org/stable/c/496269d12072ecb219826485bdbec70c92a8eef5\nhttps://git.kernel.org/stable/c/d2a0cac10597068567d336e85fa3cbdbe8ca62bf",
    "id": "CVE-2026-43253",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 4bf5beef578e46393f11eb69dda7d17a065e05ff\nLinux Linux 4bf5beef578e46393f11eb69dda7d17a065e05ff\nLinux Linux 4bf5beef578e46393f11eb69dda7d17a065e05ff\nLinux Linux 4bf5beef578e46393f11eb69dda7d17a065e05ff\nLinux Linux 4bf5beef578e46393f11eb69dda7d17a065e05ff\nLinux Linux 4.9",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
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            "privilegesRequired": "",
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            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "4bf5beef578e46393f11eb69dda7d17a065e05ff",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
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    "ai_score": 0
}