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CVE-2019-19582

Status: ModifiedMedium (6.5)—

An issue was discovered in Xen through 4.12.x allowing x86 guest OS users to cause a denial of service (infinite loop) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: On x86 accesses to bitmaps with a compile time known size of 64 may incur undefined behavior, which may in particular result in infinite loops. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. x86 systems with 64 or more nodes are vulnerable (there might not be any such systems that Xen would run on). x86 systems with less than 64 nodes are not vulnerable.

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (2)

Fedoraproject — FedoraXEN — XEN

CWEs

References

Raw JSON (NVD)

Show
{
  "id": "CVE-2019-19582",
  "cveTags": [],
  "metrics": {
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        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
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          "baseScore": 2.1,
          "accessVector": "LOCAL",
          "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
          "authentication": "NONE",
          "integrityImpact": "NONE",
          "accessComplexity": "LOW",
          "availabilityImpact": "PARTIAL",
          "confidentialityImpact": "NONE"
        },
        "acInsufInfo": false,
        "impactScore": 2.9,
        "baseSeverity": "LOW",
        "obtainAllPrivilege": false,
        "exploitabilityScore": 3.9,
        "obtainUserPrivilege": false,
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    "cvssMetricV31": [
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          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
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          "privilegesRequired": "LOW",
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  "affected": [
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      "affectedData": [
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          "vendor": "n/a",
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          "versions": [
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              "status": "affected",
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  "published": "2019-12-11T18:16:19.537",
  "references": [
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      "source": "cve@mitre.org"
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      "source": "cve@mitre.org"
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      "source": "cve@mitre.org"
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    {
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    {
      "url": "https://security.gentoo.org/glsa/202003-56",
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      "url": "https://www.debian.org/security/2020/dsa-4602",
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  "vulnStatus": "Modified",
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      "source": "nvd@nist.gov",
      "description": [
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          "lang": "en",
          "value": "CWE-835"
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  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "An issue was discovered in Xen through 4.12.x allowing x86 guest OS users to cause a denial of service (infinite loop) because certain bit iteration is mishandled. In a number of places bitmaps are being used by the hypervisor to track certain state. Iteration over all bits involves functions which may misbehave in certain corner cases: On x86 accesses to bitmaps with a compile time known size of 64 may incur undefined behavior, which may in particular result in infinite loops. A malicious guest may cause a hypervisor crash or hang, resulting in a Denial of Service (DoS). All versions of Xen are vulnerable. x86 systems with 64 or more nodes are vulnerable (there might not be any such systems that Xen would run on). x86 systems with less than 64 nodes are not vulnerable."
    },
    {
      "lang": "es",
      "value": "Se detectó un problema en Xen versiones hasta 4.12.x, permitiendo a usuarios invitados del sistema operativo x86 causar una denegación de servicio (bucle infinito) porque es manejada inapropiadamente cierta iteración de bits. En varios lugares, el hipervisor está usando mapas de bits para rastrear cierto estado. La iteración sobre todos los bits implica funciones que pueden comportarse inapropiadamente en ciertos casos de esquina: en x86, los accesos a mapas de bits con un tiempo de compilación de un tamaño conocido de 64 pueden provocar un comportamiento indefinido, lo que en particular puede dar como resultado bucles infinitos. Un invitado malicioso puede provocar un bloqueo o bloqueo del hipervisor, resulta en una Denegación de servicio (DoS). Todas las versiones de Xen son vulnerables. Los sistemas en x86 con 64 o más nodos son vulnerables (es posible que Xen no ejecute ninguno de esos sistemas). Los sistemas en x86 con menos de 64 nodos no son vulnerables."
    }
  ],
  "lastModified": "2026-06-17T02:26:53.993",
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              "versionEndIncluding": "4.12.1",
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  "sourceIdentifier": "cve@mitre.org"
}