{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8370c3d08bd98576d97514eca29970e03767a5d1"
            },
            {
              "fixed": "dc7a4bfde507ffe1d8bef49aba1322f1d20c2cb3"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/4xxx/CVE-2022-4994.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: wean fast IN from emulator_pio_in\n\nUse __emulator_pio_in() directly for fast PIO instead of bouncing through\nemulator_pio_in() now that __emulator_pio_in() fills \"val\" when handling\nin-kernel PIO.  vcpu-\u003earch.pio.count is guaranteed to be '0', so this a\npure nop.\n\nemulator_pio_in_emulated is now the last caller of emulator_pio_in.\n\nNo functional change intended.",
  "id": "CVE-2022-4994",
  "modified": "2026-08-01T03:32:49.850854384Z",
  "published": "2026-07-30T09:18:06.591Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc7a4bfde507ffe1d8bef49aba1322f1d20c2cb3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/4xxx/CVE-2022-4994.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-4994"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "KVM: x86: wean fast IN from emulator_pio_in"
}