FKIE_CVE-2026-29643

Vulnerability from fkie_nvd - Published: 2026-04-20 22:16 - Updated: 2026-04-21 20:16
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
Summary
XiangShan (Open-source high-performance RISC-V processor) commit edb1dfaf7d290ae99724594507dc46c2c2125384 (2024-11-28) contains an improper exceptional-condition handling flaw in its CSR subsystem (NewCSR). On affected versions, certain sequences of CSR operations targeting non-existent/custom CSR addresses may trigger an illegal-instruction exception but fail to reliably transfer control to the configured trap handler (mtvec), causing control-flow disruption and potentially leaving the core in a hung or unrecoverable state. This can be exploited by a local attacker able to execute code on the processor to cause a denial of service and potentially inconsistent architectural state.
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/issues/3959
cve@mitre.orghttps://github.com/OpenXiangShan/XiangShan/pull/3966
134c704f-9b21-4f2e-91b3-4a467353bcc0https://github.com/OpenXiangShan/XiangShan/issues/3959
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "XiangShan (Open-source high-performance RISC-V processor) commit edb1dfaf7d290ae99724594507dc46c2c2125384 (2024-11-28) contains an improper exceptional-condition handling flaw in its CSR subsystem (NewCSR). On affected versions, certain sequences of CSR operations targeting non-existent/custom CSR addresses may trigger an illegal-instruction exception but fail to reliably transfer control to the configured trap handler (mtvec), causing control-flow disruption and potentially leaving the core in a hung or unrecoverable state. This can be exploited by a local attacker able to execute code on the processor to cause a denial of service and potentially inconsistent architectural state."
    }
  ],
  "id": "CVE-2026-29643",
  "lastModified": "2026-04-21T20:16:40.223",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-04-20T22:16:23.507",
  "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/issues/3959"
    },
    {
      "source": "cve@mitre.org",
      "url": "https://github.com/OpenXiangShan/XiangShan/pull/3966"
    },
    {
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "url": "https://github.com/OpenXiangShan/XiangShan/issues/3959"
    }
  ],
  "sourceIdentifier": "cve@mitre.org",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-703"
        }
      ],
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "type": "Secondary"
    }
  ]
}


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