fkie_cve-2021-47255
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2025-04-30 15:11
Severity ?
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: kvm: LAPIC: Restore guard to prevent illegal APIC register access Per the SDM, "any access that touches bytes 4 through 15 of an APIC register may cause undefined behavior and must not be executed." Worse, such an access in kvm_lapic_reg_read can result in a leak of kernel stack contents. Prior to commit 01402cf81051 ("kvm: LAPIC: write down valid APIC registers"), such an access was explicitly disallowed. Restore the guard that was removed in that commit.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/018685461a5b9a9a70e664ac77aef0d7415a3fd5Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/218bf772bddd221489c38dde6ef8e917131161f6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a2aff09807fbe4018c269d3773a629949058b210Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bf99ea52970caeb4583bdba1192c1f9b53b12c84Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/018685461a5b9a9a70e664ac77aef0d7415a3fd5Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/218bf772bddd221489c38dde6ef8e917131161f6Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a2aff09807fbe4018c269d3773a629949058b210Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/bf99ea52970caeb4583bdba1192c1f9b53b12c84Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13
linux linux_kernel 5.13


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkvm: LAPIC: Restore guard to prevent illegal APIC register access\n\nPer the SDM, \"any access that touches bytes 4 through 15 of an APIC\nregister may cause undefined behavior and must not be executed.\"\nWorse, such an access in kvm_lapic_reg_read can result in a leak of\nkernel stack contents. Prior to commit 01402cf81051 (\"kvm: LAPIC:\nwrite down valid APIC registers\"), such an access was explicitly\ndisallowed. Restore the guard that was removed in that commit."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: kvm: LAPIC: Restaurar protecci\u00f3n para evitar el acceso ilegal al registro APIC. Seg\u00fan el SDM, \"cualquier acceso que toque los bytes 4 al 15 de un registro APIC puede causar un comportamiento indefinido y no debe ejecutarse \". Peor a\u00fan, dicho acceso en kvm_lapic_reg_read puede resultar en una fuga del contenido de la pila del kernel. Antes de confirmar 01402cf81051 (\"kvm: LAPIC: anotar registros APIC v\u00e1lidos\"), dicho acceso se prohib\u00eda expl\u00edcitamente. Restaura la guardia que se elimin\u00f3 en esa confirmaci\u00f3n."
    }
  ],
  "id": "CVE-2021-47255",
  "lastModified": "2025-04-30T15:11:57.737",
  "metrics": {
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      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-05-21T15:15:14.303",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "value": "NVD-CWE-Other"
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      "source": "nvd@nist.gov",
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}


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