{
  "cveId": "CVE-2021-47255",
  "url": "https://patchblox.com/security/cve/CVE-2021-47255",
  "summary": "CVE-2021-47255 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47255, released May 21, 2024. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  kvm: LAPIC: Restore guard to prevent illegal API...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  kvm: LAPIC: Restore guard to prevent illegal APIC register access  Per the SDM, \u0022any access that touches bytes 4 through 15 of an APIC register may cause undefined behavior and must not be executed.\u0022 Worse, such an access in kvm_lapic_reg_read can result in a leak of kernel stack contents. Prior to commit 01402cf81051 (\u0022kvm: LAPIC: write down valid APIC registers\u0022), such an access was explicitly disallowed. Restore the guard that was removed in that commit.",
  "published": "2024-05-21T15:15:14Z",
  "severity": "high",
  "cvss": 7.1,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
  "epss": 0.00244,
  "epssPercentile": 0.15679,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47255",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47255",
      "released": "2024-05-21T15:15:14Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47255",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47255",
      "released": "2024-05-21T15:15:14Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "5.10.46-1",
      "fix": "DEBIAN-CVE-2021-47255",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-47255",
      "released": "2024-05-21T15:15:14Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}