CVE-2026-29646_CVE-2026-29646

{
    "lastseen": "",
    "description": "In OpenXiangShan NEMU prior to 55295c4, when running with RVH (Hypervisor extension) enabled, a VS-mode guest write to the supervisor interrupt-enable CSR (sie) may be handled incorrectly and can influence machine-level interrupt enable state (mie). This breaks privilege/virtualization isolation and can lead to denial of service or privilege-boundary violation in environments relying on NEMU for correct interrupt virtualization.",
    "published": "2026-04-20T00:00:00.000Z",
    "modified": "2026-04-21T19:50:49.314Z",
    "type": "cve",
    "title": "CVE-2026-29646",
    "source": "mitre",
    "references": "https://docs.riscv.org/reference/isa/priv/machine.html\nhttps://github.com/OpenXiangShan/NEMU/issues/951\nhttps://github.com/OpenXiangShan/NEMU/pull/938\nhttps://github.com/OpenXiangShan/NEMU/pull/938/commits/55295c46580456d8d5a9d5736e1fda924b8825ab\nhttps://docs.riscv.org/reference/isa/unpriv/zicsr.html\nhttps://docs.riscv.org/reference/isa/priv/supervisor.html\nhttps://docs.riscv.org/reference/isa/priv/hypervisor.html",
    "id": "CVE-2026-29646",
    "bulletinFamily": "",
    "cwe": [
        "CWE-267"
    ],
    "cvelist": null,
    "sourceData": "n/a n/a n/a",
    "sourceHref": "",
    "cvss": {
        "score": 9.8,
        "severity": "CRITICAL",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "OpenXiangShan NEMU",
    "version": "prior to 55295c4",
    "vendor": "OpenXiangShan",
    "ai_description": "Privilege/virtualization isolation break due to incorrect handling of VS-mode guest write to supervisor interrupt-enable CSR",
    "ai_severity": "Critical",
    "ai_vendor": "OpenXiangShan",
    "ai_product": "NEMU",
    "ai_version": "prior to 55295c4",
    "ai_score": 9.8
}