FKIE_CVE-2026-29642

Vulnerability from fkie_nvd - Published: 2026-04-20 21:16 - Updated: 2026-04-21 20:16
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
A local attacker who can execute privileged CSR operations (or can induce firmware to do so) performs carefully crafted reads/writes to menvcfg (e.g., csrrs in M-mode). On affected XiangShan versions (commit aecf601e803bfd2371667a3fb60bfcd83c333027, 2024-11-19), these menvcfg accesses can unexpectedly set WPRI (reserved) bits in the status view (xstatus) to 1. RISC-V defines WPRI fields as "writes preserve values, reads ignore values," i.e., they must not be modified by software manipulating other fields, and menvcfg itself contains multiple WPRI fields.
References
cve@mitre.orghttps://docs.riscv.org/reference/isa/priv/machine.html
cve@mitre.orghttps://docs.riscv.org/reference/isa/priv/priv-csrs.html
cve@mitre.orghttps://github.com/OpenXiangShan/XiangShan/commit/5e3dd63
cve@mitre.orghttps://github.com/OpenXiangShan/XiangShan/issues/3934
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A local attacker who can execute privileged CSR operations (or can induce firmware to do so) performs carefully crafted reads/writes to menvcfg (e.g., csrrs in M-mode). On affected XiangShan versions (commit aecf601e803bfd2371667a3fb60bfcd83c333027, 2024-11-19), these menvcfg accesses can unexpectedly set WPRI (reserved) bits in the status view (xstatus) to 1. RISC-V defines WPRI fields as \"writes preserve values, reads ignore values,\" i.e., they must not be modified by software manipulating other fields, and menvcfg itself contains multiple WPRI fields."
    }
  ],
  "id": "CVE-2026-29642",
  "lastModified": "2026-04-21T20:16:40.063",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-20T21:16:19.393",
  "references": [
    {
      "source": "cve@mitre.org",
      "url": "https://docs.riscv.org/reference/isa/priv/machine.html"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://docs.riscv.org/reference/isa/priv/priv-csrs.html"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/OpenXiangShan/XiangShan/commit/5e3dd63"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/OpenXiangShan/XiangShan/issues/3934"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-1244"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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