GHSA-729M-5X6M-WWXV

Vulnerability from github – Published: 2026-04-20 21:31 – Updated: 2026-04-21 21:31
VLAI?
Details

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.

Severity ?
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-29646"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-267"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-20T21:16:19Z",
    "severity": "CRITICAL"
  },
  "details": "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.",
  "id": "GHSA-729m-5x6m-wwxv",
  "modified": "2026-04-21T21:31:21Z",
  "published": "2026-04-20T21:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-29646"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpenXiangShan/NEMU/issues/951"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpenXiangShan/NEMU/pull/938"
    },
    {
      "type": "WEB",
      "url": "https://github.com/OpenXiangShan/NEMU/pull/938/commits/55295c46580456d8d5a9d5736e1fda924b8825ab"
    },
    {
      "type": "WEB",
      "url": "https://docs.riscv.org/reference/isa/priv/hypervisor.html"
    },
    {
      "type": "WEB",
      "url": "https://docs.riscv.org/reference/isa/priv/machine.html"
    },
    {
      "type": "WEB",
      "url": "https://docs.riscv.org/reference/isa/priv/supervisor.html"
    },
    {
      "type": "WEB",
      "url": "https://docs.riscv.org/reference/isa/unpriv/zicsr.html"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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